Observation 44434: Dibaeis absoluta (Tuck.) Kalb & Gierl
When: 2009-11-29
Herbarium specimen reported

Notes: I found this growing on a bit of moss on the side of the Alum Cave trail up to Leconte last year. I’m not positive of the ID, but the microscopic and chemical details of the ascomata are identical to Dibaeis baeomyces. According to the Ozarks keys there is a second, rare species, D. absoluta which is stalkless and which has a much less well-developed crust. This species is not currently listed for the park.

[admin – Sat Aug 14 02:03:12 +0000 2010]: Changed location name from ‘Mt Leconte, Great Smoky Mountains NP, Tennessee, USA’ to ‘Mount Leconte, Great Smoky Mountains National Park, Tennessee, USA

Images

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algal crust
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apothecial section in water at 100x
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apothecial section in water at 100x in cross-polarized light (bright areas due to lichen substance, clears in K)
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spores in water at 1000x
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ascus stained in Lugol’s at 1000x

Proposed Names

87% (1)
Eye3 Eyes3
Used references: “Ozark Keys” Harris & Ladd 2005; confirmed by James Lendemer, specimen at NY
Based on microscopic features: simple spores, asci with IKI+ blue tips
Based on chemical features: K+ pale yellow apothecia

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2010-04-19 17:18:34 EDT (-0400)
Last modified: 2010-09-04 16:17:27 EDT (-0400)
Viewed: 46 times, last viewed: 2016-10-24 02:37:54 EDT (-0400)
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