Observation 11524: Acarospora badiofusca (Nyl.) Th. Fr.
When: 2008-06-06
Herbarium specimen reported

Notes: crust lichen, on rock (not sandstone)
THALLUS: subsquamulose, areoles not overlapping, shiny, deep grayish brown, convex, K-, C-
MEDULLA: whitish, K-, C-
ALGAE: green, in a continuous layer
APOTHECIA: sunken, one per areole; epihymenium brown; hymenium clear; hypothecium clear, going quite deep; paraphyses simple, clear, gradually enlarging upward, 3.1+/-0.5 µm wide at base and 4.8+/-0.5 µm wide at tips; asci broadly clavate, walls and tip I+ very weak blue; all POL-, all K-
SPORES: many per ascus, clear, simple, round to oblong, (3.5)4.9+/-0.8(6.4) x (2.1)2.8+/-0.4(3.6) µm (N=27)

There are, alas, many brown Acarospora. This one is distinguished by being C-, having a continuous algal layer, spres 3-6 µm long, and relatively thick paraphyses (2.3-3 µm thick at base).

Images

22772
at 30x
22773
apothecial section, in water, at 400x
22774
thallus section, in water, at 400x
22775
Asci and paraphyses, in K, at 1000×. Note huge number of immature spores still in asci.
22776
Several mature spores, in K, at 1000×.

Proposed Names

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Used references: Nash’s Sonoran Flora
Based on microscopic features
Based on chemical features

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Eye3 = Observer’s choice
Eyes3 = Current consensus

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Created: 2008-09-24 14:44:24 PDT (-0700)
Last modified: 2008-09-24 14:44:24 PDT (-0700)
Viewed: 181 times, last viewed: 2016-08-06 12:22:27 PDT (-0700)