When: 2017-04-19
Collection location: San Luis Obispo Co., California, USA [Click for map]
35.2505°N 120.651°W 50m [Click for map]
Who: J-Dar
Notes:
On weathered siliceous rock, north-facing.
Thalus white, thin, continuous, without prothallus, K-, C- KC-. Apothecia black. Hymenium hyaline, I+Blue ephemeral, epihymenium red-brown.
8 spores per ascus, uniserate. Asci cylindric, I+ pale blue, inner layer I+R? Spores simple, hyaline, broadly ellipsoid to tear-drop to egg shaped. About 18×11µm.
Images
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 0.00 | 0 | ||||||
| Could Be | 1.0 | 5.66 | 1 | (J-Dar) | |||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
0.85 | 28.33% | |||||||
| User’s votes are weighted by their contribution to the site (log10 contribution). In addition, the user who created the observation gets an extra vote. | |||||||||
| Vote | Score | Weight | Users | ||||||
|---|---|---|---|---|---|---|---|---|---|
| I’d Call It That | 3.0 | 0.00 | 0 | ||||||
| Promising | 2.0 | 5.66 | 1 | (J-Dar) | |||||
| Could Be | 1.0 | 5.55 | 1 | (zaca) | |||||
| Doubtful | -1.0 | 0.00 | 0 | ||||||
| Not Likely | -2.0 | 0.00 | 0 | ||||||
| As If! | -3.0 | 0.00 | 0 | ||||||
| Overall Score sum(score * weight) / (total weight + 1) |
1.38 | 46.06% | |||||||
Comments
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Interesting that you have trouble getting a C+r reaction. It’s usually quite strong in Trapelia. You might try doing a C test on an apothecial section for verification.
The excellent photos of ascus stains, and those peculiar pseudolecanorine apothecia clearly show Trapelia.
I wouldn’t worry too much about whether it is T. coarctata or T. glebulosa, those are definitely not good species (at least according to molecular studies). It’s just that no one really knows what the correct species concepts are…
Thanks for that, Trapelia is new to me but I tried and couldn’t get any C+ reaction on the thallus, so I figured even though it was biatorine that it might be some odd Lecanora. I can’t find a description of Trapelia glebulosa or a key to separate it from T. coarctata, but I’ll get it off Bio One at some point.
“A revision of the saxicolous, esorediate species of Ainoa and Trapelia (Baeomycetaceae and Trapeliaceae, lichenized Ascomycota) in North America, with the description of two new species”
Created: 2017-07-02 00:51:22 CEST (+0200)
Last modified: 2017-07-02 01:22:27 CEST (+0200)
Viewed: 41 times, last viewed: 2019-08-20 13:41:56 CEST (+0200)
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It seems this is a really distinctive genus, thank you both for the info. Like those ascus stains? I was really happy how they came out. Wish it was this easy for those species that require tholus characteristics! I had fun with the micro on this one as everything just behaved nicely.