Observation 134672: Isaria umbrina Persoon
When: 2013-05-24

Notes: Probably a common eastern crust, but I don’t know it by name.

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what a wonderful fungus
By: Danny Newman (myxomop)
2013-05-28 19:44:45 CDT (-0400)

both the I. umbrina link and whatever is pictured here. keeping big googly eyes on this one for sure.

Isaria and Hypoxylon anamorphs
By: Gerhard Koller (Gerhard)
2013-05-28 10:04:31 CDT (-0400)

do not have basidia, they are deuteromycetes. They just possess conidiophores and conidia.
So if you find basidia in the big one it could be a crust. Problem is in such preparations there are usually a big variety of imperfect fungi or other crusts or other small ascomycetes. Take as small a sample as possible.
Good picture of the European Isaria umbrina is here:


Looks like I need to dig deeper…
By: Nathan Wilson (nathan)
2013-05-28 09:36:24 CDT (-0400)

Martin, I agree those don’t look like good matches, but I can see the similarity.

Gerhard, Thanks for the clues. Any suggestions on what to look for under a scope?

Third pic
By: Gerhard Koller (Gerhard)
2013-05-28 07:52:11 CDT (-0400)

is either a Nodulisporium/Geniculosporium anamorph of the red Hypoxylon or the red Hypoxylon is parasitized by Isaria umbrina or some closely related Isaria species.
The other pics could either be a crust or also an anamorphic Hypoxylon.

Here were my first thoughts on seeing this
By: Martin Livezey (MLivezey)
2013-05-27 21:29:03 CDT (-0400)



But after looking at these I am not sure we are even in the ball park. Maybe it is common, but I have not seen such a range of forms on one log before.

Created: 2013-05-27 21:23:19 CDT (-0400)
Last modified: 2017-06-13 22:21:05 CDT (-0400)
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