Observation 86641: Pyrenula mamillana (Ach.) Trevisan
When: 2012-01-20
No herbarium specimen
0 Sequences

Proposed Names

34% (2)
Recognized by sight
56% (1)
Recognized by sight
84% (1)
Used references: TICOLICHEN paper covering Pyrenula; Harris’s “More Florida Lichens” – see comments

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Okay, how about P. mamillana
By: Jason Hollinger (jason)
2012-01-20 19:08:37 CST (-0500)

It is allegedly common. Here’s a photo. Looks plausible. Of course, so do dozens of others, I’m sure! It is supposed to have a “heavily inspersed” hymenium, naked shiny perithecia (as the photos show), spores 15.5-21 × 5.5-8 µm, and perithecia 0.7-1.5 mm across (“flattened conical”). [Details from Harris’s “More Florida Lichens”.]

The TICOLICHEN paper also covers Pyrenula. It agrees: if inspersed, it should be P. mamillana, if not, it keys to P. dermatodes, but the perithecia are almost hidden in the accompanying figure. So it must be P. mamillana.

PS. I was wrong about the spore color. You must have an immature spore. They should turn gray-brown when mature. I make that mistake all the time. Sorry!

About Pyrenula
By: Eduardo A. Esquivel Rios (Eduardo27)
2012-01-20 18:34:19 CST (-0500)

The spore size is about: 15 – 20 x 10 – 12 um

By: Jason Hollinger (jason)
2012-01-20 17:58:35 CST (-0500)

Didn’t see the spore photos! Definitely Pyrenula. Looked through the key for Florida species… wow, there are a lot of species. These spores look relatively small (did you get a measure of the length?). Based on length < 21µm, perithecia with ostiole in center, not clumped, thallus corticate, endospore well-developed making lenticular lumina with thick walls… There are still several options based on size of perithecia, oil drops in the hymenium, and exact size of spores. Some options: P. rubrostoma, P. mamillana, P. santensis. Larger-spored species matching what we can see: P. quassiaecola (common and widespread), P. punctella (northern I think).

Pyrenula sp. likely
By: Jason Hollinger (jason)
2012-01-20 17:48:12 CST (-0500)

Need to check spores to get to species.

Created: 2012-01-20 17:37:48 CST (-0500)
Last modified: 2012-01-20 19:09:42 CST (-0500)
Viewed: 63 times, last viewed: 2017-06-10 09:03:32 CDT (-0400)
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