Observation 197688: Bisporella sulfurina (Quél.) S.E. Carp.

Found by Christian Schwarz.

Cups up to 1 mm across, growing on the cut surface of a large log.

A few free floating spores found: 9-11 × 2-3. An ascus: 60 × 7. Paraphyses septate, ends not enlarged, 1-2 microns wide.

The second photo (taken with natural light) shows the color more accurately.

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Thanks, Elsa
By: Sava Krstic (sava)
2015-02-13 03:23:39 CST (-0600)

Your id may be correct.

From Mykoweb: “Bisporella sulfurina is a tiny, lemon-yellow discomycete unusual in that it fruits in close association with a pyrenomycete. The latter is recognized by a layer of blackish tissue found in close proximity to the brightly colored discs.”

I’m attaching a picture showing that the wood around our yellow discos is covered by a black mass that also contains a lot of tiny perithecia. I just tried to look inside one of them, without success.

Unofortunately, I cannot confirm that the spores are biseptate. Those few that I saw floating around did not have septa.

Created: 2015-02-01 13:33:40 CST (-0600)
Last modified: 2015-02-13 02:58:13 CST (-0600)
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