Observation 92119: Byssomerulius corium (Pers.) Parmasto

When: 2012-04-06

Collection location: Davis, California, USA [Click for map]

Who: Byrain

No specimen available

Growing on a fallen Casuarina equisetifolia branch. I did some limited micro work, but I haven’t gotten around to getting any literature yet to do anything with…

I found a few spores, but was only able to get only 3 measurements so far, 8×3, 7×3, 6×3 μ. I did not find any cystidia, and basidia were 4-spored (And maybe some 2-spored ones) with knob-like sterigmata, and the hyphae was with thick somewhat yellowish walls in KOH and no clamps.

Species Lists


Spore and hymenial surface
Mounted in KOH
1μ divisions
Basidia and hymenial surface
Mounted in KOH
1μ divisions
Thick walled hyphae
Mounted in KOH
1μ divisions
Mounted in KOH

Proposed Names

28% (1)
Recognized by sight
Based on microscopic features
61% (2)
Recognized by sight: I see a wrinkled surface and it looks fairly soft
Used references: http://www.mycobank.org/...

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
You must know
By: Gerhard Koller (Gerhard)
2012-04-07 14:05:49 -03 (-0300)

that in Corticiales often there are different stages in what appears one fruitbody. So one does well to make preparations from another part if one is not good or immature. It is a bit like polypores who are perennual and develop new zones of growth. Even with huge experience which I have after decades it is often impossible to tell how old or young a crust fungus is. There are maybe 20-30 species which you can tell by the naked eye after years but all of the rest you need optical help. And the look can vary very much nevertheless. But this phenomenon is also with gilled mushrooms. The only difference is in them you have more macroscopical features to rely on which can be deceptive though.
Try another section of your find when you do scope again.

By: Byrain
2012-04-07 13:55:58 -03 (-0300)

It was mostly the keys I was after, I didn’t think the North Europe book would be all I needed. I was following darv’s advice in observation 87374 for literature, but I haven’t looked into getting Berniccia yet and Ginns also seems hard to track down.

As for the current fruiting conditions, its been raining on and off every few days and there are a few gilled fungi around. These seem relatively fresh and not dried out, but I don’t have much point of reference in judging maturity.

North Europe book
By: Gerhard Koller (Gerhard)
2012-04-07 13:35:44 -03 (-0300)

would be of very limited use in Cal, don’t you have some work on crusts in America? If I remember right there have been a few mycologists dealing with them. But ok if you want to get an overview to genera (there’s a general key in it). You can also try to get a copy of Berniccia which is more up to date but microscopical figures are not that good. Most of them you can find in Mycobank by now too.
With crusts it is like with other fungi. If the weather was dry during collecting you will have bad luck if not you will find spores. Best time for collecting is like with gilled mushrooms: fall and spring, also mild winters. It is not true if you think these mushrooms are not dependent on humid weather conditions. All entities need water. And if they are too young … it is also parallelled. To keep sterile, immature, too young specimen is mostly useless unless there is hope someone will do DNA on it but even then they are no good material in most of cases.
How were conditions on this find?

Re: comments
By: Byrain
2012-04-07 13:22:57 -03 (-0300)

Gerhard, thanks for the feedback.
I’ll add some micro work later when I have a chance. And I agree that I should get some congo red already, its just one online order away. :)
Also, I noticed that the section I made had very few spores, is this to be expected? Or does it indicate that the section was immature?

Christian, thanks for the tip.
I like looking at crusts, but it seems without literature I really can’t get very far on my own. It doesn’t help that The Corticiaceae of North Europe volumes which seem most helpful are only available to me if I visit European libraries..

I am not familiar with Californian crusts,
By: Gerhard Koller (Gerhard)
2012-04-07 07:51:34 -03 (-0300)

but this reminds me of something like Stromatoscypha or Scytinostroma (amongst thousand other options, hehe). In the mic pics I could not see any dichohyphidia which should be present in Scytinostroma. But the hyphal system seems to be dimitic. You should test dextrinoidity. And it is better to do microscopy in Congo Red so that the structures are more clearly visible.

Great stuff
By: Christian (Christian Schwarz)
2012-04-07 01:06:50 -03 (-0300)

I think Tom Bruns will be your best bet.
It’s only a matter of time until I start seriously considering possibly eventually perhaps occasionally intermittently looking at least halfheartedly at crust fungi.

Created: 2012-04-07 00:34:07 -03 (-0300)
Last modified: 2012-11-07 06:35:31 -02 (-0200)
Viewed: 176 times, last viewed: 2017-11-09 01:55:46 -02 (-0200)
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