Observation 62887: Tapesia fusca (Pers. ex Mérat) Fuckel
When: 2010-06-18
No herbarium specimen

Notes: Could be confused with Mollisia ligni, but the latter has a whiter rim. Supposedly, the genera Tapesia and Mollisia are distinguished by the presence or absence of a subiculum, but that distinction is widely disputed. The white Ascomycete at the upper right is Dasyscyphus virgineus.

Proposed Names

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Used references: Breitenbach and Kränzlin, Fungi of Switzerland, vol. I (Ascomycetes)
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microscopical details
By: Andreas Gminder (mollisia)
2011-01-29 19:00:39 CET (+0100)

are missing, therefore it could be any Mollisia, even a undescribed one. For M. fusca the blueish hue is missing, but it could nevertheless be that species.
M. ligni is no species to confuse with M. fusca, neither macroscopically nor microscopically. M. ligni is easily identified by the negative reaction of the ascus pore to Lugols solution. Only very few Mollisias have a negative reaction.
M. ligni in Fungi of switzerland is a wrong identification. The Mollisia shown there is completely different, undescribed species (M. “pyrenopezizoides” in my Mollisia-key).
M. fusca is one of the species with a very distinct yellow reaction on KOH, and therefore together with the big spores with many oil drops and the wide subicular hyphae quite easily to determinate.
The presence or absence of a subikulum is no constant feature in many Mollisia/Tapesia species and therefore the synonymy between Mollisia and Tapesia is (nearly?) unambigousely accepted. Mollisia has been conserved over Tapesia.
Andreas

Created: 2011-01-29 05:13:06 CET (+0100)
Last modified: 2012-06-21 04:12:46 CEST (+0200)
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