Observation 70207: Collema F.H. Wigg.

When: 2011-06-18

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

Who: zaca

No specimen available

Growing on calcareous rock.


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= Observer’s choice
= Current consensus


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You are not alone
By: Jason Hollinger (jason)
2011-06-30 19:35:50 CDT (-0500)

Collema and Leptogium are widely considered to be among the hardest macrolichen genera. I have the same problems as you. I can only recommend patiently sticking to it, collecting and making notes of everything. Maybe it will eventually begin to make sense. (Let me know when it does, I need help, too! :)

It is a pity …
By: zaca
2011-06-30 17:47:26 CDT (-0500)

because I (believe to have) found in this area a great amount of different species and it is very difficult for me to use the key (as usual there are some specific terminology for this and closer genera, making the progression very difficult). For the specimens with apothecia I can always try to observe under the microcope, which I already did for some and I will do for others, but for the species without apothecia there are no other chance. On the other hand, and this is repetitious, the checkelist of my country for the genus Collema does not help: ironically, species like C. fuscovirens, C. polycarpon and C. tenax are not mentioned there.
Regarding this specimen, I saw no better choice and no alternative I could find. At least I already know what it is not.
Thanks, Jason, for your comment.

Wish I could be more constructive
By: Jason Hollinger (jason)
2011-06-30 10:13:25 CDT (-0500)

But C. fuscovirens is one of the few I feel comfortable with, and this doesn’t look like it at all. It’s a much smaller species with a distinctive olive/greenish cast. I wouldn’t be at all surprised if this really is Collema, but I vote against C. fuscovirens.