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Observation 11596: Ascomycota Caval.-Sm.

crust lichen, on dead oak branch, at 9000-9500’
THALLUS: endocorticate or blackish-leprose
MEDULLA: no sign
ALGAE: green round cells
APOTHECIA: minute disks, width (0.15)0.19+/-0.03(0.23) mm (N=9), reddish translucent, no visible rim, epihymenium and hymenium and hypothecium all faintly pinkish turning faintly yellowish in K; paraphyses v thin and a bit wavy but rarely branched and definitely not tangled, tips abruptly swollen, tips (2.2)3.4+/-0.6(4.2) µm (N=17), base (1.0)1.3+/-0.2(1.7) µm (N=17); asci long cylindrical, K/I+ golden to reddish brown, walls and tip thin; all K/I- or faintly golden, all POL-
SPORES: 8 per ascus, simple (hard to really be sure but none showed any sign of a septum), hyaline, fusiform, (8.9)10+/-1.0(13.0) x (1.8)2.1+/-0.3(2.8) µm (N=22)

Every apothecium was associated with nearby algae, however it is still possible this is merely a parasite or an otherwise unlichenized fungus. (Several were far from any other lichens, so parasite is doubtful.)

The only lichenized genus that comes close as far as I can tell (based mainly on the K/I reaction and lack of thollus) is Absconditella. However this genus is supposed to have yellowish not reddish apothecia, and its spores are always at least once-septate.

Species Lists


at 30x, next to Buellia disciformis/chrysoleuca
at 30x
Apothecial section, in water, at 400×.
Asci, etc. in K/I, at 1000×.

Proposed Names

87% (1)
Based on microscopic features: But is it a lichen?…

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= Observer’s choice
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