Observation 68661: Pertusaria DC.

When: 2011-05-15

Collection location: Planalto das Cezaredas, Portugal [Click for map]

Who: zaca

No specimen available

Some characteristics of this specimen:
Macroscopic – greenish to yellowish thallus, ascomata with ostiola some of then fused to but not forming discs, with a positive C+ orange reaction mainly in ostioles;
Microscopic – a dark epithecium and a more or less hyaline hypothecium; asci mostly simple but some with more than 1 ascospore; big ascopores – average values observed: 97 × 43 µm (N=6) – some ovoid and others cylindrical, with 2-layered spore wall, the inner one being very thick (up to 8-9 µm) and the outer wavy.
Despite of being cosmopolitan, according to CNALH , I was not able to find a good european reference for it.


Proposed Names

20% (2)
Used references: CNALH
Based on chemical features: See Notes.
56% (1)
Recognized by sight: see comment

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= Observer’s choice
= Current consensus


Add Comment
That’s life.
By: zaca
2012-03-01 15:27:27 PST (-0800)

Thanks, Jason, for keeping the information updated.

Revisited in light of new data
By: Jason Hollinger (jason)
2012-02-19 10:34:44 PST (-0800)

Andrew sent me something which is keying out to P. pustulata in Wisconsin, North America. It looks nothing like this. I’m trying to find a better name for yours, but I’m failing. The spore size and number is correct, as is the C+ orange reaction on the ostioles, but the spores should be at most faintly ornamented/wavy (some sources call them entirely smooth), and the verrucae should be pyramid-shaped, yours are almost globose and clearly constricted at the base. P. pertusa allegedly has verrucae shaped like this, but its spores are much larger and lacks the C+ reaction. That exhausts the British Flora, unfortunately.

I have several North American sources I could bring to bear, but this genus doesn’t seem to have great overlap between Europe and North America, so that probably wouldn’t be helpful. Besides, none of them suggest any other names, either.

I’m sorry, but until we find better literature for southwestern Europe, I have to “demote” this observation to Pertusaria sp..

The bigger spore I’ve seen in the “kingdom” of lichens!
By: zaca
2011-06-05 17:29:09 PDT (-0700)

I also find it very difficult to count the spores in an ascus, because it is difficult to individualize them and, in most cases, are still in formation.

Wow, that’s quite a spore!
By: Jason Hollinger (jason)
2011-06-05 12:11:39 PDT (-0700)

Never get old, do they? My only problem with the genus is determining how many spores per ascus. Seems like I almost always underestimate. I guess one or more spores are missing from every ascus I check.

Created: 2011-06-05 11:56:52 PDT (-0700)
Last modified: 2012-02-19 10:35:27 PST (-0800)
Viewed: 118 times, last viewed: 2019-02-13 04:32:03 PST (-0800)
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