Fungus Fact Friday

Tagged: mushroom

fungi with macroscopic fruiting bodies

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Current / Fungus Fact

#071: Flammulina velutipes, The Velvet Foot or Enoki

It’s often said that you can tell how edible a mushroom is by the number of names it has. This concept certainly applies to the edible Flammulina velutipes, which goes by the common names Enokitake (and the shortened form Enoki), Velvet Foot, Winter Mushroom, and Golden Mushroom, as well as many other derivatives and regional names (if you’re outside the United States, you probably call it something else!). Another reason the species has so many names is because it looks very different in the wild than it does in the grocery store: in the wild, it grows as an orange umbrella-shaped mushroom with a black fuzzy stipe, but when cultivated it grows as a pale thin needle-shaped (or perhaps spaghetti-shaped) mushroom with a tiny pileus. I generally use the names F. velutipes, Velvet Foot, and Enoki, since each one emphasizes a different physical aspect of the mushroom.

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#235: Developmental Mycology

Developmental biology focuses on the question, “How do organisms start out as a single cell and then become large complicated structures with distinct tissues, shapes, and sizes?” In the context of mycology, studying development means researching the formation of structures such as mushrooms, sclerotia, and rhizomorphs. Not surprisingly, most developmental mycology research focuses on mushrooms, which are the largest and most interesting of the complex structures formed by fungi. In my previous post (FFF#234), I summarized what we know about mushroom development. Today, I will go into more detail on the mechanisms and processes that drive fruitbody development.

Amanita muscaria development 2

Current / Fungus Fact

#234: Mushroom Development

My first introduction to mushrooms was as a child seeing them appear as if by magic in my family’s lawn. This mysterious way that fungi appear to pop into existence still captures my imagination, which brought me to the small but interesting field of mushroom development. So, can science explain how mushrooms appear out of thin air? Mostly, but there is still much we don’t know. Obviously, mushrooms don’t materialize out of nothing – instead, they sprout from the mycelium already growing in the substrate. Typically, this proceeds as follows: the mycelium bunches up, then the various mushroom tissues are created, and finally whole fruitbody gets larger. However, this generalized model has limitations and can’t explain all the variation we see in mushroom shapes. Why Study Mushroom Development? Before we get into the details, it is useful to discuss why mushroom development should be studied. One of the major reasons...

Phleogena faginea on oak bark 0

Fungus Fact

#233: Phleogena faginea

Phleogena faginea is a bizarre little mushroom. This tiny grey-brown mushroom grows on wood or bark, making it rather difficult to spot. Even when you do find it, you’d probably think it’s a slime mold (FFF#053): the fruitbody features a round head on a small stalk, much like many slime molds. Despite that similarity, P. faginea is a basidiomycete and its closest relatives are the rust fungi (FFF#130) – something you probably wouldn’t guess by looking at the mushroom. P. faginea goes by the common name of “Fenugreek Stalkball,” which is a reference to its shape (ball on a stalk) and fenugreek or curry-like odor when dried.

Gyromitra brunnea 0

Fungus Fact

#232: Gyromitra brunnea

Gyromitra brunnea is a false morel (see FFF#034) that is fairly common in the eastern and midwestern parts of North America. Like the other false morels, it has a solid to chambered stipe and a wrinkly head. The thing that sets G. brunnea apart, however, is that the cap is highly lobed and there are white seams along the edges of the lobes. No other false morels feature these seams, making G. brunnea easy to identify.

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Fungus Fact

#067: Mushroom Morpholgy: Verpas

The genus Verpa contains just a handful of species that are encountered occasionally.  These mushrooms look a lot like morels (FFF#033), but are attached just at the top of the cap and have a stipe filled with cottony material.  The cap of a verpa hangs down around the stipe, rather like a thimble on top of a finger.  This arrangement has led to the common names “Thimble Cap” or “Thimble Fungus,” although I usually just call them “verpas.”  Verpas tend to appear just before morels, so if you find one you should come back to check for morels after a week or two.

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Fungus Fact

#231: Hypholoma tuberosum

I first saw this mushroom in 2017 at a foray in Pennsylvania.  There wasn’t much out, so six of us spent a lot of time trying to identify these little brown mushrooms growing in mulch right outside the foray center.  We ruled out everything in our keys and couldn’t nail down the species until we found sclerotia growing below the mushrooms.  As it turns out, the sclerotia are the only interesting feature of these LBMs.  Brown cap, brown stalk, dark spores, small, growing in mulch – this description could apply to hundreds of mushrooms until you get into the nitty-gritty details.  Fortunately, you can easily separate these mushrooms from similar ones by looking for the sclerotia.

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Fungus Fact

#230: Lichenomphalia umbellifera

Nearly all lichens belong to the Ascomycota, but there are some lichenized basidiomycetes (often called “basidiolichens”)… and a few of those actually form mushrooms!  Lichenomphalia umbellifera is a lichen that forms a small agaric.  If you find this mushroom, you would probably dismiss it as just another LBM, unless you notice the lichen at its base.  The lichen part of this mushroom consists of tiny green bubbles that seem to be sprinkled over its substrate.  You’re most likely to find L. umbellifera in the Pacific Northwest – just remember not to overlook the small mushrooms!

Buglossoporus quercinus 4

Fungus Fact

#229: Buglossoporus quercinus

Buglossoporus quercinus is an interesting polypore that most of you probably haven’t seen before.  I’ve seen it only once, myself, brought in at a mushroom club meeting.  It reminds me of a yellow version of Ischnoderma resinosum.  B. quercinus forms brackets that are fuzzy yellow on top with a white pore surface below.  All parts of the mushroom stain brown when handled.  The coloration and staining make it a unique mushroom.  The Global Fungal Red List Initiative lists B. quercinus as “vulnerable” because it is rarely found and grows on only old oak trees – a habitat that is in decline across Europe.  Although B. quercinus is primarily known from Europe, it was recently discovered growing in eastern North America.

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Fungus Fact

#227: Polyporus umbellatus, the Umbrella Polypore

I have never found Polyporus umbellatus, but apparently I’m not alone.  This mushroom has a wide range that covers the whole northern hemisphere but the mushrooms are still uncommon.  Known as the “Umbrella Polypore,” P. umbellatus forms rosettes on the ground under hardwood trees.  The central stalk branches repeatedly and each branch ends in a circular umbrella-like cap (hence its common name).  Umbrella Polypores appear in the spring just after morel season and sometimes reappear in the fall.  The fungus is a weak parasite and can feed on its host trees for decades, so after you find one once, you know where to find some next year!  The mushroom is considered edible and medicinal, although different parts are used for each purpose.