Chapter 19: Phylum Basidiomycota: Order Aphyllophorales—Polypores, Chantharelles, Tooth Fungi, Coral Fungi, and Corticioids

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Imagine a world where the quiet decomposers of the forest floor are also these master chemists, intricate architects,

even vital partners in the hidden lives of trees and animals.

It's a world we often walk right past, isn't it?

But we're stepping into that kingdom of fungi today.

Exactly.

And specifically, we're taking a deep dive into a really fascinating and incredibly diverse group,

the order of philipharals.

They're part of the broader phylum of the city of Mycota.

Our mission really is to pull out the most surprising and important insights from some pretty dense scientific stuff.

We want to make the complex biology and ecology clear, engaging,

and accessible for you.

Think of it as your shortcut, a way to get genuinely well informed about a group of fungi that are, frankly, everywhere.

They're shaping ecosystems, impacting our health,

often in ways you just wouldn't expect.

That's right.

So over the next few minutes, we'll explore their unique, sometimes kind of bizarre structures.

We'll get into their crucial roles in breaking down wood, and that's more nuanced than you might think.

We'll uncover some unexpected medical uses, ecological importance, and even touch on the puzzle of how scientists actually classify these things.

Yeah, it's a bit of a challenge, taxonomically speaking.

So get ready for some genuine aha moments that might just change how you see the world around you.

OK, let's start with this incredible diversity.

You hear fungi, maybe a picture of a classic mushroom with gills.

Right, the standard image.

But these philipharals, they often look completely different.

It's a really varied group, isn't it?

What kinds of forms might we actually, you know, bump into out there?

You're spot on.

The visual diversity is huge.

And yeah, that's part of the charm and the challenge.

Some are super inconspicuous, like just thin layers of paint or crust on deadwood, almost like a web of fungal threads.

Sort of flat.

Yeah, basically flat, resupenant forms.

But then you get the really obvious ones, often named for what they look like, think

Sturdy, poor fungi,

elegant club fungi, these intricate coral fungi that look almost like something from under the sea.

Sharp tooth fungi.

And of course, the very familiar bracket fungi or shelf fungi jutting out from tree trunks.

Like little ledges.

Exactly.

And there's even one called the beefsteak fungus because, well, it honestly looks uncannily like a slice of raw meat.

No way.

OK, the names definitely paint a picture.

So beyond these shapes, what's the core thing, the defining feature that lumps all these different looking fungi together as a philipharous?

Fundamentally,

unlike those typical gilled mushrooms, these fungi generally don't have gills.

Instead, their spore producing surface, we call that the hymenium, it's typically exposed right from the beginning while the stores are still developing.

Like naked spores?

Kinda, yeah.

They're always visible as they mature.

That's a key trait.

And this hymenial surface, it can be smooth or ridged, maybe warded or toothed, or most commonly it's poured.

Little tiny holes, which is why lots of them get called polypores.

Got it.

So it's not just the outside appearance, it's how they're built deep down microscopically that allows for all this variety, what's happening with their internal architecture.

Right.

This is where their engineering really comes in.

The fungal body itself, the basidiocarp, it's built from these complex networks of thread -like cells, hyphae.

The building blocks.

Exactly.

And many of phylloforels are pretty unique because they use not just the basic living hyphae, but also specialized types, things like skeletal hyphae or binding hyphae.

Skeletal like giving it structure.

Precisely.

They're thicker, sometimes unbranched, giving rigidity.

The binding ones add flexibility and cohesion.

This internal mix, this hyphal system, is what lets them build everything from those flimsy, paint -like crusts to really tough, woody shell fungi that can last for years.

That makes sense.

The internal scaffolding dictates the shape.

And speaking of microscopic wonders, I heard about a type of specialized cell that sounds, well, almost predatory.

Some of them had trapping worms.

Ah, you must mean Stefanocysts.

Yes.

These are tiny globe -shaped structures and they have these distinct little frilled crowns on them.

Frilled crowns?

Yeah, it looks like a little crown.

And what's absolutely wild is that these are actually specialized nematode traps.

Get out.

Really?

Yes.

The fungus secretes this sticky goo, an adhesive mucilage, and it ensnares microscopic worms, nematodes that wander by.

Then it consumes them.

So a tiny, sticky fungal trap.

Hunting worms.

That's incredible.

It really is.

A surprising bit of active predation from something we usually think of as just quietly decomposing.

Okay, so all these amazing structures, they're ultimately for one purpose.

Making more fungi.

Propagation.

Which brings us to their reproductive strategies and these complex genetic rules for mating.

Basidium mysis generally have a standard life cycle, right?

They do, mostly.

The aflopherals typically follow that pattern.

The main body, the mycelium, grows hidden, often inside wood.

Then when conditions are right, pup, out comes the visible part, the basidiocarp, the fruiting body.

The shell for the coral or whatever shape it is.

Exactly.

And that produces the spores.

Inside special cells, the basidia, the nuclei fuse, go through meiosis and usually produce four tiny basidiospores.

And these spores almost always get forcibly ejected, shot out into the air.

Launched into the world.

But it's not just making spores.

It's about who gets to, well, mate with whom.

How do these incompatibility systems work?

The mating games.

Right, it's fascinating.

Most of the aflopherals are heterothallic.

Basically that means you need two different but compatible individuals for sexual reproduction to happen successfully.

Like a lock and key.

Exactly like a lock and key.

Mycelia with the same mating genes, the same key, can't fuse.

They need different genetic codes at specific spots.

And this is brilliant, evolutionarily speaking, because it forces outbreeding.

It mixes up the genes, ensuring genetic diversity for the next generation.

Makes total sense.

Keeps the gene pool healthy.

And when two compatible partners do fuse, they form what's called a heterocharyon.

That's a mycelium that now has two genetically different nuclei living together in the same cells.

And that heterocharyon is what usually goes on to build the fruiting body.

Okay, so that's for making the next generation.

But there's another system, right?

One that controls fusion between mature individuals.

Yes, and this is really cool.

It's called vegetative incompatibility.

Think of it as like a genetic border patrol.

It stops genetically different mature mycelia from just fusing together willy -nilly, even if they're technically compatible for mating.

Why would it do that?

It helps maintain the integrity of individual fungal organisms in nature.

Keeps their distinct identities intact, like, you know, maintaining property lines.

And you can sometimes actually see this.

Where two different fungal individuals meet in decaying wood, they might form visible zone lines.

A dark line marking their boundary.

A mineral turf war boundary.

Mm -hmm.

Amazing.

So they're controlling mating and maintaining their own individual space.

What if they can't find a mate, though?

Do they have a Plan B asexual option?

Oh, absolutely.

Plan B is important.

Whilst this is key, many apheliferals can reproduce asexually, too.

Some just produce simple asexual spores called canidia.

Others form these thick -walled resting spores, clemetospores, that can survive tough times.

Just wait it out.

Pretty much.

And then you have really impressive survival structures like sclerotia.

Think of the tuccahoes we mentioned earlier.

These are dense, compact masses of mycelium, almost like a tuber, that can survive drought or cold for long periods.

Fungal hibernation, essentially.

Wow.

From life cycles to survival pods.

These fungi really are nature's essential engineers.

And their main job, the one we always think of, is decomposition.

They're the ultimate recyclers, yeah.

Absolutely critical recyclers.

Their subprobic activities, breaking down dead organic matter, are fundamental.

Especially wood.

They tackle the really tough stuff, cellulose and lignin, the main structural components of plants.

Without them, we'd just be buried in logs and leaves.

Literally buried.

They unlock those nutrients and make them available again.

In this breakdown, it's not all the same, is it?

There are these two main types, white rot and brown rot.

This is where the chemistry gets really interesting.

Let's start with white rot.

Okay.

White rot.

That's the more common tip.

You can think of these fungi as the thorough cleaners.

They generally remove all the major wood components, lignin, hematololose, cellulose, more or less simultaneously.

Break it all down.

The wood stays fibrous, but it gets weaker and weaker, often looks bleached or stringy or kind of flaky, lamellated.

They achieve this with powerful enzymes they secrete outside their cells, basically digesting the wood externally.

Industrial strength cleaning crew.

Got it.

But brown rot sounds different.

Very different strategy.

Fewer species do brown rot, but they're incredibly important, especially in coniferous forests, forests with pine, fir, spruce trees.

These fungi primarily go after the cellulose and hematololose.

They leave the lignin mostly behind, just slightly modified.

What's left is this crumbly brown cubicle residue.

Cubicle, like little blocks.

Yeah, it breaks apart into little cubes.

This residue, this isn't just waste.

This brown rot humus, as it's sometimes called, it's an ecological superhuman.

How so?

Well, this lignin -rich stuff is incredibly resistant to further decay.

It can persist in the soil for thousands of years.

It builds up humus, which is absolutely essential for healthy coniferous ecosystems.

Wow.

Thousands of years.

What does it do for the soil?

It improves soil structure, aeration, water retention.

It promotes those vital mycorrhizal partnerships between fungi and tree roots, even helps with nitrogen fixation.

It's foundational, which really makes you question the practice of removing all dead wood, especially conifers, from forests.

That residue is a vital legacy.

That's a huge ecological insight.

It's not just decay.

It's creation of something vital and long -lasting.

This chemistry, this decay power,

it's useful beyond the forest, right?

Biotechnology.

Absolutely.

Scientists are really excited about harnessing these fungal enzymes for bioremediation, using them to break down pollutants like pesticides or industrial waste, and also for things like pulp bleaching and papermaking.

Using fungal enzymes could be a much greener, cheaper way to remove lignin than using harsh chemicals.

Very cool.

But beyond decomposition, these fungi aren't always the good guys, ecologically speaking.

Many are significant pathogens.

They attack living trees.

That's the other side of the coin, yes.

Many are serious parasites.

They get into trees, usually through wounds, and cause heart rot or root rot decay inside the living tree.

Weakening it from the inside out.

Exactly.

Think of species like Ganoderma, those shelf fungi you often see on living trees.

They can cause significant internal decay.

There was a stark example after Hurricane Andrew hit Louisiana back in 92.

Most of the trees that blew down.

Turned out they already had extensive heart or root rot caused by these fungi.

The storm just revealed the pre -existing weakness.

And some of these fungal threats can stick around for a really long time, can't they?

They sure can.

Species like Heterobasidia and Anisum are notorious pathogens, especially in managed pine forests.

The fungus can survive as living mycelium in the dead root systems of stumps for decades, even up to a century.

A century, wow.

Yeah.

So when new trees are planted, their roots can grow into contact with these old infected roots and boom, the disease spreads.

Thinning operations in forests, while necessary sometimes, can actually create wounds on remaining trees or stumps, giving the fungus new ways in.

It's a persistent problem.

So if we have problem fungi, can we use other fungi to fight them?

That's a really exciting area, biological control.

And yes, sometimes we can.

There's a great example, Phlebiopsis gigante.

It's another wood decay fungus, but it's not usually pathogenic.

Foresters can actually apply spores of Phlebiopsis onto freshly cut stumps, especially pine stumps.

Phlebiopsis is a fast colonizer.

It gets there first, establishes itself, and essentially outcompetes the bad guy, Heterobasidian, preventing it from infecting the stump and spreading through root contact.

That's brilliant, like sending in the good guys first.

It is.

Some have even experimented with putting the Phlebiopsis spores directly into the chain oil of the chainsaws used for thinning.

So as the cut is made, the stump surface is immediately inoculated.

That is incredibly clever.

And of course, their destructive power isn't limited to forests.

Dry rot.

That's a term that strikes fear into homeowners.

Oh, absolutely.

The infamous dry rot fungus, Serpula lacrimens, can cause devastating damage to wooden structures, houses,

historically ships,

mine timbers, you name it.

But dry rot is a bit misleading, isn't it?

It doesn't actually like dry conditions?

Exactly.

It's a misnomer.

It needs moisture to get started, like any fungus.

But what makes Serpula so destructive is its ability to produce these specialized thick cord -like structures.

Rhizomorphs.

Rhizomorphs.

Like roots.

Sort of like fungal roots, yeah.

They can transport water and nutrients over remarkable distances, so the fungus can start growing in a damp basement corner, say, but then send out these rhizomorphs across dry brickwork or plaster to reach dry timber elsewhere in the house, bringing the water with it.

That's what makes it so insidious.

Well, it brings its own plumbing.

Okay, so beyond fungi versus fungi and fungi versus our houses, they also have some surprising links with animals, right?

Not just as food.

Definitely.

Think about habitat creation.

Aldo Leopold, the famous conservationist, pointed this out long ago.

Fungal rots soften the wood in standing trees, especially the heartwood.

Making it easier to dig into.

Precisely.

This creates cavities that are absolutely essential for many cavity nesting birds, like the red cockaded woodpecker in the southeastern U .S.

Its decline is directly linked to the loss of old -growth pine forests, trees old enough to have significant heart rot softened by these fungi.

No old rotten trees, no nesting sites.

So the fungi are ecosystem engineers for birds, too.

What about insects?

Some really intricate relationships there.

Many beetles feed on or breed within these fungal structures.

But then you have these fascinating, almost symbiotic partnerships, certain wood wasps, for example.

Yeah.

The female wasp has special pouches where she carries fungal spores.

When she lays her eggs in wood, she simultaneously inoculates the wood with the fungus.

The fungus starts to decay the wood, making it easier for the wasp larva to eat and digest.

It's a package deal.

The wasp disperuses the fungus.

The fungus feeds the wasp larva.

Incredible teamwork.

And then there's termites.

Some termite species are actually attracted to wood decayed by specific brown rot fungi.

There is evidence the fungi might even improve the nutritional quality of the wood for the termites, potentially influencing their colony growth and how many offspring they produce.

Amazing.

Okay, let's shift gears from ecology to, well, us.

How have these fungi unexpectedly intercepted with human history and culture?

This is where some really surprising stories emerge, I think.

Oh, absolutely.

The history of medicinal use is incredibly deep.

Probably the most famous example is Ganodermalucidum, known widely as Ling Shi in China, or Reishi in Japan.

The mushroom of immortality.

That's the one.

It's legendary in traditional Chinese medicine.

It's been credited with, well, almost everything, curing diseases, purifying blood, lowering cholesterol, promoting longevity.

A true panacea in folklore.

Quite a reputation.

Are there other examples of medicinal ephelopherales?

Lots.

In India, for instance, over a dozen species of a related genus, Phyllinus, have traditional medicinal uses.

And researchers have actually isolated antibiotic compounds from some species, like from Phlebia.

So there's modern scientific interest backing up some of the traditional claims.

And that story about Phomatopsis officinalis, the shaman's fungus,

that one has real cultural depth.

It's fascinating.

This was a large, chalky white polypore, often found on larch trees.

Commercially, it was once harvested because it contains agaric acid, which was used to reduce sweating in tuberculosis patients.

Its spongy texture also made it useful as a styptic to stop bleeding.

Practical uses.

But the shaman connection.

That's the really compelling part.

Indigenous peoples of the Pacific Northwest, particularly shamans, carved its fruiting bodies into human or animal figures.

These were believed to have supernatural healing powers, used in rituals, sometimes placed near sick individuals, or even buried with the dead as spiritual guardians.

There's even speculation it might be linked to a Hada creation myth about fungus man creating women, possibly inspired by drawings made on the fungus's smooth, pore surface.

It shows a really deep spiritual connection.

That's incredible.

And speaking of ancient connections,

the 5 ,000 -year -old ice man, Earthsy, he was carrying fungi too, wasn't he?

He was.

He had pieces of two different polypores with him.

One was Pyptoporus bitulinus, the birch polypore.

And the big mystery is why.

Medicine or something else.

Exactly.

Pyptoporus has known medicinal properties.

It contains compounds with antibiotic and anti -inflammatory effects.

And it might have been used against parasites, which Earthsy likely had.

But it's also excellent tinder for starting fires.

The other fungus he carried was almost certainly used as tinder.

So was the birch polypore his medicine cabinet or part of his fire starting kit?

The debate continues.

It really highlights how useful these fungi were to ancient peoples.

Medicine, tinder.

What about food?

Are any of these actually good to eat?

Yes, some definitely are.

The beefsteak fungus, Pistolina hepatica, apparently really does resemble and taste a bit like beef when cooked.

Huh.

Then there's the bear's head fungus, or lion's mane, Horicium aranasium.

It's this beautiful white shaggy looking thing with long spines.

And it's considered a choice edible, also used medicinally now.

The bright yellow sulfur fungus, or chicken of the woods, Lytocorus sylphurus, is another well -known edible, though some people have reactions to it.

Chicken of the woods.

Interesting name.

And don't forget the tuccohoes.

Yeah.

Wolffiboria cocos, those underground sclerotia we mentioned.

They were a traditional food source for Native Americans, dug up and eaten.

So food, medicine, tinder.

What else?

That artist's conk.

Ah, yes.

Ganoderma aplenatum.

It gets that name because its underside, the pore surface, is incredibly smooth and white when fresh.

Yeah.

If you take a sharp point like a stick or even a fingernail and draw on it, it causes an immediate dark brown oxidation reaction right where you touched it.

It's permanent, so people literally use them as natural canvases to create intricate drawings and etchings.

It's pretty cool.

A living canvas.

It's amazing.

And historically, people use the tough, fibrous flesh of other polypores for things like razor strops for sharpening razors or as curry combs for grooming horses, even for making dyes.

Really versatile materials.

Truly versatile.

OK, for our final segment, let's dive into the big scientific challenge,

actually classifying the epiphyllophis.

It's been called a chaotic mass, and you mentioned it's polyphyletic.

What does that really mean for scientists trying to organize them?

It means it's messy.

Polyphyletic means that the group, as traditionally defined, doesn't include all the descendants of a single common ancestor.

Instead, members have evolved similar features like having pores instead of gills or tough, leathery textures independently multiple times.

So just because two fungi look similar, like they both form shells with pores, doesn't mean they're closely related.

Exactly.

That's convergent evolution in action.

It makes classification based purely on looks, on morphology, really tricky.

Early mycologists did their best, grouping them by high metaphor -shaped pores, teeth, smooth surfaces, but they recognized it was somewhat artificial.

It was a practical system, but not necessarily reflecting deep evolutionary history.

A chaotic mass, indeed.

So how did scientists start to untangle this?

What changed the game?

The huge game changer has been molecular data, analyzing DNA sequences, especially from ribosomal RNA genes,

has revolutionized fungal taxonomy.

It allows mycologists to reconstruct evolutionary trees based on genetic relatedness, not just physical appearance.

So genetics reveals the true family tree.

Pretty much.

It lets us identify true monophyletic groups where all members do share a single recent common ancestor.

And it clearly shows those instances of convergent evolution confirming that, say, the poroid form or certain types of hyphal construction or even types of wood rot evolved independently in completely different lineages.

It's leading to a major reorganization of families in general.

That sounds like a massive undertaking.

Can you give us just a quick taste of the kinds of features molecular data helps highlight?

Maybe look at a few example families.

Sure.

Let's take the hymenocaytaceae.

Molecular data supports this as a natural group.

What often links them, besides genetics, are features like those unique brownish, thick -walled, porgy structures in the hymenium called setae.

And many of them have this characteristic chemical reaction where their tissues turn blackish when you put a drop of potassium hydroxide, KOH, on them, the xanthochroic reaction.

They're all white rotters, too.

OK, so a combination of microstructures and chemistry backed by DNA.

What about another one?

Maybe the family with reishi.

Right.

That's ganodermataceae.

Again, molecular data strongly supports this family.

They're known for ganoderma species like reishi and the artist's conch.

Besides the often shiny, varnished cap surface in some species, a key unifying feature is their very distinctive basidiospore structure.

They have a double wall with ornamentation between the layers.

It's quite unique.

There may be one more, completely different.

How about schizophytia?

This family contains schizophyllum commune, the split gill fungus.

It's found worldwide, a real weed species, and it's become a major model organism in fungal genetics research.

Molecularly, it's distinct, and morphologically, it's unmistakable because its gills are actually split down the middle and they curl inwards when dry, protecting the hymenium, then open up again when moist.

Super clever adaptation.

Split gills.

Wow.

And one last one, maybe the Kaniophoreshi.

Molecular data groups these together.

They're notable because they are all brown rot fungi, and they have distinctively colored basidiospores that stain strongly with a dye called cotton blue.

We call that cyanophilus.

And interestingly, this family includes the infamous dry rot fungus, Serpila lacrimens.

Fascinating how genetics helps group these fungi by shared traits, even linking decay type or spore characteristics.

So wrapping this up, we journeyed from their incredible shapes and hidden structures, to their complex mating systems and survival tactics, to their absolutely critical roles as decomposers, both white rotters and those ecologically vital brown rotters, uncovering surprising medicinal uses, and their intricate connections with animals and even human culture.

And finally, touching on the ongoing quest to understand their true evolutionary relationships using modern tools.

It really underscores that these Ophelia ferales, they're not just simple molds or brackets.

They are dynamic, complex organisms, truly silent engineers shaping our world, from forest health to biotechnology to potentially new medicines.

Absolutely.

And what's really exciting is knowing there's still so much more to discover about them.

So maybe the next time you're out for a walk and you see a shell fungus on a tree, or even just a strange crust on an old log.

Take a closer look.

Remember the universe of biological complexity humming away inside.

These fungi are constantly transforming our world in ways we're really only just beginning to fully grasp.

It makes you wonder, what other hidden biological processes are unfolding all around us, just waiting for us to notice?

We certainly hope this deep dive has sparked some curiosity and given you a new appreciation for these often overlooked but profoundly important members of the fungal kingdom.

Thank you so much for joining us on this deep dive.

We really appreciate you being part of the deep dive family.