Observation 122661: Pseudobaeospora Singer
When: 2013-01-12
35.5618° -84.2329° 259m
0 Sequences

On humus and woody debris under hardwoods. Spores VERY SMALL (approx 3.5 × 2.0 microns), hyaline, appear to be smooth and inamyloid.

Cap diameter 0.5-1.0 cm. Stipe length 1.0-2.0 cm. Stipe width 1.5-2.5 mm.

Proposed Names

31% (2)
Based on chemical features: Weak positive blue PDAB reaction
40% (4)
Eye3 Eyes3
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
np Christine
By: jimmiev
2013-01-12 18:51:57 PST (-0800)

it’s my best guess after a quick search didn’t show any Lyophyllum or Tephrocybe with spores that small

I may have found the same species in the winter before:

Else Vellinga could probably say if these belong in Pseudobaeospora or not.. I may be way off!

By: Christine Braaten (wintersbefore)
2013-01-12 17:49:48 PST (-0800)

Thanks for this suggestion. I think the most distinctive character for this mushroom was its very tiny spores.

By: Christine Braaten (wintersbefore)
2013-01-12 15:27:18 PST (-0800)

para-Dimethylaminobenzaldehyde, I think, turns tissues of members of Lyophyllaceae blue. I don’t know exactly what the reaction is, or how reliable the test is for determining Lyophyllum species as it also seams to turn paper blue. But many mushrooms, not Lyophyllaceae, do not have a reaction with PDAB.

By: Danny Newman (myxomop)
2013-01-12 13:46:09 PST (-0800)

what’s pdab?

Created: 2013-01-12 12:05:34 PST (-0800)
Last modified: 2013-01-13 13:21:26 PST (-0800)
Viewed: 139 times, last viewed: 2017-06-26 16:00:54 PDT (-0700)
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