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The Amateur Mycologist #30 - Cordyceps capitata

The Amateur Mycologist #30 - Cordyceps capitata

These posts are not for foraging. They are intended for entertainment and intellectual satisfaction only. These posts are not a field guide nor comprehensive in any way - their accuracy is not assured in any way. Do not eat wild mushrooms unless you are a professional, have substantial professional assistance or have a wealth of personal experience with a specific species. Do not make any foraging decisions based on these posts. To do so could be dangerous or life threatening.

This post does not include edibility or toxicity information

Today we have something very special.

Two firsts in one post:

  1. The first ascomycetes I've personally found; and
  2. The first Cordyceps species I've found!

Ascomycetes is a Phylum within the Kingdom fungi. Most of the mushrooms I've discussed and found have been Basidiomycetes. The difference is as follows:

  1. Basidiomycetes disperse spores using structures calls basidia. We've seen these several times now under the microscope in prior posts involving basidiomycetes mushrooms

  2. Ascomycetes do not disperse their spores using basidia. Instead, the spores grow inside of cylindrical sacs called asci. Once they are mature, the spores are propelled out of the asci and into the world.

Now there are many famous ascomycetes mushrooms - top among them being the morel. However, far stranger mushrooms also call the Phylum home, including Cordyceps capitata.


Stumbling upon this species in the forest, it is not remarkable looking at a glance.

Yet, something about the mushroom called to me very distinctly, as though I had seen it somewhere before. Yet I could not put my finger on what it was that made it special. I bent down low and looked carefully at the two specimen with my hand lens. The strange mushrooms had an almost vestigial feel.

I noted that the cap was oddly textured, like shaved human skin with goose bumps.


At the time, I couldn't tell whether the cap was fully developed.

The dark yellow stem with some darker coloration along its length seemed to disappear seamlessly into the phallic head of the mushroom. Looking at where the cap met the stem it seemed unlikely that this cap was simply immature, but I wasn't certain.

At this point I thought perhaps this was some kind of club fungus, except that the distasteful raised pores seemed likely to be the source of the spores.

At this point, I made the biggest mistake yet - I tore the two mushrooms up from the ground, breaking the stem, put them in my bag and walked away.

Later I started to analyze them in more detail at home and eventually realized my mistake.


If there were any lingering doubts as to maturity, bifurcating one specimen banished them.

The center of the mushroom was an undifferentiated white from the top tip of the cap down almost two inches into the stem. The stem itself seemed to have once been a similar color, but had begun to fade. Over the next day or two it would shrivel up almost entirely.

It was after this cross section that I started to get a bad feeling, as though I had really missed something. Looking at these, I now became fairly certain this was in the Phyllum Ascomycetes. But something else was nagging at me...

Let's zoom in on the edges of this bifurcated specimen.


You can see that the cap is covered in a differentiated layer of tubes.

Maybe half a mm or less in thickness, the entire cap is ensconced in these tubes. These tubes are called perithecia - and the raised dots on the outside of the cap are the tops of the perithecia. Inside of the perithecia grow the asci, and in them the spores.

It was at this point that the truth struck me like a bag of bricks - this was a cordyceps! The yellow tube, the strange phallic head with the goosebumps. I had just read about this a few days earlier. But, tragically I forgot - and as a result the most amazing part of this mushroom was not collected!

This species is called Cordyceps capitata, and like most Cordyceps species, it is a parasitic organism. Unlike Cordyceps militaris, pictured to the right protruding from the parasitized corpse of a bug, C.capitata preys on a different food source: other mushrooms.

Specifically, C.capitata latches on to a false truffle which grows underground, usually in the genus Elaphomyces. There are no public domain images of this, although the internet is rife with examples. However, in order to illustrate my point here I took the liberty of mocking up the hopefully delightfully rudimentary diagram to the left.

The truffle takes root underground and grows in the dirt. At some point it is infected by C.capitata spores, and the Cordyceps begin stealing away the nutrients of the Elaphomyces fungus. Eventually, when it has taken enough, the Cordycep decides it is time to reproduce and it shoots its heads upwards on a yellow stem. The head breaks through the earth and appears to be a simple terrestrial mushroom.

To the casual observer - or the even the totally non casual amateur mycologist - C.capitata looks like a fairly normal mushroom. But had I carefully dug down around these two mushrooms, there would have been ANOTHER mushroom from which these two were growing.

Instead, I made the novice mistake of simply tearing the mushroom up from the stem and breaking it off, leaving behind the most interesting part of this species' life cycle.

Well - "most interesting" might not be entirely true. Take a look at what happened after I left it overnight.


My suspicions about those raised pores were confirmed by the presence of a sharply fuzzy spore mass in the morning.

You can clearly see here how the spores have been expelled. It looks unnervingly like hundreds of black heads being popped simultaneously. The spores actually start off as much longer threadlike spores. However, while still in the asci, the large spore threads break down into multiple smaller spores - Lincoff says into exactly 7 pieces.

Whatever the number, the result is the same - the spores are broken inside of the asci and then ejected from the mushroom. They even leave a spore print.


This was surprising to me, but apparently the spores are pushed out with a decent amount of force, relatively speaking. Even more interesting is their microscopic shape.


If you've been keeping up with my posts, then this cylindrical spore will be unlike anything you've yet seen on this blog.

The spores vary by a few microns in length, but under a microscope it is fairly easy to see how they might all be pieces of larger strands of spores.

Let's get in real close and measure these things

measured 400.png

All within a range from about 13 microns up towards 19 microns in length.

It is best practice when identifying a Cordyceps to also procure its parasitic source. Doing so can help to confirm the species you've found. However, this specimen was still quite generous with the detail it provided and based on those details, I feel very confident about its identity.

As a side note, Gary makes a claim in the Audobon that I felt deserved a bit more research. And I did confirm that apparently C.capitata and its host Elaphomyces fungus have played a role in some hallucinogenic mushroom rituals in Mexico. However, it seems like they were generally used in conjunction with known Psilocybe mushrooms - as there is no information I could find indicating that C.capitata or its host contain any hallucigenic substances.

But even if they did not contribute to the hallucinogenic experience directly, I can certainly understand how they might play a symbolic spiritual role in such mystic traditions. There is something truly bizarre about a mushroom as strange and alien as this growing out of another, hidden mushroom. It feels important somehow, even to me just stumbling upon it in the woods.


  • Fruiting Body – The cap was about 1.5 CM high and maybe a CM wide. It was brown and covered in fine raised pores across its entire surface. The flesh inside is undifferentiated white, and bifurcating the head reveals a layer less than 1mm thick of tube like structures called perithecia. The spores are developed inside asci inside of the perithecia and ejected from the raised pores on the outside of the head when mature.
  • Flesh = Undifferentiated white from the top down through the top of the stem. May change color or yellow with time.
  • Stem ("stipe") = The stems of these specimens were 3-5cm long and about 1cm wide, tapering a bit toward the top. The stem is dark yellow and quickly shrivels to almost nothing, like a dry twig, within several hours of picking the mushroom. There was some darker reticulation near the top of the stem, almost olive colored. Importantly, the stem appears purely terrestrial, but continues down below the earth, ending in a hidden false truffle, probably a Elaphomyces species. If you find this mushroom, don't forget to carefully dig down to the host in order to get the full, awesome, picture.

  • Spore Print = White

  • Ecology ("How it grows.") = Parasitic on other buried mushrooms - usually a false truffle in the genus Elaphomyces.
  • Distribution = Lincoff places them all over North America. However sighting on Inaturalist are weirdly restricted to within the tri-state area and to a small patch on the west coast. This may simply be a measure of Inaturalist's user base location.
  • KOH reactivity = Might darken slightly - but not listed anywhere as a significant identifying element.
  • Microscopic Traits = Spores are cylindrical - they apparently begin as large single strands and break up while still in the asci, the microscopic structures wherein they develop. A spore print can be retrieved from this species, and once expelled, the rods have a size range from 13-20 microns x 2 - 4 microns.


Photos Are My Own Except

[6]By H. Krisp (Own work) [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons

Microscopic photos were taken using an AMScope M150B entry level microscope. If you use microscopes, I'm quite sure you've never heard of this model - but its cheap and available on Amazon. The camera lens is also AMScope, MD35 - by far their crappiest microscope camera. But, still capable of material, relevant, and in some cases, dispositive, data collection. Lastly it should be noted that the precise magnifications are not easily deduced using the camera - but based on relative spore sizes compared to known microscopic photos from Kuo and other sources, I estimate 40, 100 and 400x.

Information Sources

[1][Gary Lincoff, Audobon Society North American Mushroom Field Guide, Cordyceps capitata, p.368]

[2]Inaturalist on C.capitata

[3]First-nature on C.capitata

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