When: 2017-02-20

Collection location: Atascadero, California, USA [Click for map]

35.4553°N 120.6888°W 302m [Click for map]

Who: J-Dar

Specimen available

On soil and moss over rock in grassy opening of moist north-slope blue oak woodland.


100x in water
100x in water cross polarized
400x in water cross polarized
100x in water with K, cross-polarized. Note lack of remaining crystals
Asci and spores

Proposed Names

-28% (1)
Recognized by sight
-28% (1)
Recognized by sight
57% (1)
Based on microscopic features: Spore size, see comment.

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= Observer’s choice
= Current consensus


Add Comment
Ignore my previous email
By: Jason Hollinger (jason)
2017-02-21 14:28:15 CST (-0500)

On second look, yeah, I think I was just thrown off by it being wet. I can see this being glaucopholis. Well done!

Trapelia vs Trapeliopsis
By: J-Dar
2017-02-21 11:10:56 CST (-0500)

Spore size comparison.

Trapelia glebulosa: (14–)16–22(–25) 3 (6.0–)8.2–10(–11) mm
Trapelia coarctata: (13–)15–20 (–22) x (6.2–)7.0–9.0(–10.5) mm
Trapeliopsis glaucopholis: (7-)8-9.1(-10) x (3-)3.9-4.3(-5) µm

Trapelia has a hyaline hymenium vs “pale yellow brown” for Trapeliopsis.

Yeah it’s Trapelia
By: J-Dar
2017-02-20 23:54:39 CST (-0500)

This specimen was soaking wet when photographed and collected, and since its still raining, it is still slowly drying out. I was waiting to dry the thallus to do spot tests, which were diagnostic. The large pinkish apothecia are drying dark with whitish pruinose margins. I’ll upload dry photos soon. There are two collections from Knudsen closer to the coast of Trapelia glebulosa, which seem to be what this is, I just haven’t found a serious description of the species yet. When the apothecia were wet I could barely find any spores, and the couple I measured were very small (see below), almost too small. Here’s some morpho notes:

Thallus white, squamulose, K+?, C+pink, fleeting. Apothecia biatorine, gelatinous when wet, thalline margin without algae. Hymenium orange, inspersed (when wet)?, POL+ purple (crazy color!). Ephymenium dark, POL+ golden crystals. Exciple POL+ with golden crystals. All crystals dissolving in K.

Spores 8/ascus, small, hyaline, simple+/- 8×5µm

Could this possibly be Trapelia?
By: Jason Hollinger (jason)
2017-02-20 18:14:05 CST (-0500)

Have you checked if it’s C+r? I’m having trouble finding young apothecia in the photos. Does this start out with thalline rims or does it ever have rims at all?