Observation 67061: Kretzschmaria deusta (Hoffm.) P.M.D. Martin
When: 2011-05-07
No herbarium specimen

Notes: Growing on dead wood. The black stuff on both sides is probably the remains of the previous fruiting of the same fungus.

Attached with a little stem. Hymenium is on top, white on the edges, (purple-)gray in the middle. Underside black. No pores or other visible structure in the hymenium.

Spore size 6-7 × 3-6 microns. Wasn’t able to see basidia.

This is certainly the same fungus as in Observation 63680, where only young specimens were found. The same-looking marbled cross-sections.

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Xylariaceae
By: Dennis Oliver
2011-05-10 12:23:34 CEST (+0200)

The best site for information on Kretzschmaria, Hypoxylon and the rest of the Xylaria-ish things is Jack Rogers and his student Yu-Ming Ju’s website:
http://mycology.sinica.edu.tw/xylariaceae/default.asp or just google Xylariaceae. Kretzschmaria is really common this spring in the Pacific Northwest on any well decomposed hardwood. check back later in the fall and look at the black ascospores.

Conidia, not spores
By: Sava Krstic (sava)
2011-05-09 01:57:36 CEST (+0200)

OK, learned from Observation 2552 and web sources that this is the imperfect stage (anamorph) of K. deusta. My “spores” are the asexual conidia (“conidiospores”), and the asci with real spores will appear in the summer.

Nice pictures on http://abneyfungi.wordpress.com/... and http://www.flickr.com/... (both spores and conidia).

Basidia?
By: Sava Krstic (sava)
2011-05-08 04:43:05 CEST (+0200)

I just added a picture with what looks like two basidia, each with one small spore on top.

Spore size?
By: Sava Krstic (sava)
2011-05-08 04:22:34 CEST (+0200)

Tim and vjp, thanks for the quick ID. Indeed, this looks very much like pictures of K. deusta observations.

I’m reading the description on http://pyrenomycetes.free.fr/.... From what it says, the fungus has asci and huge spores (25-31 × 7-10 µm), which does not match at all what I’m seeing under the scope.

Looks similar
By: vjp
2011-05-08 04:05:09 CEST (+0200)

to Kretzschmaria deusta?

Created: 2011-05-08 04:01:33 CEST (+0200)
Last modified: 2011-05-08 04:10:56 CEST (+0200)
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