Observation 116064: Collema F.H. Wigg.
When: 2012-11-07
No herbarium specimen

Notes: On soil underneath spinuose shrub about 10m west of gravel road from Puerto Madryn and Punto Loma, ~5km along route.

Black squamulose reminscent of a leafy Collema with dark pinkish apothecia with isidiated margins? Or what is that type of margin called? But these apothecia seem to only be evident in the wettened photo.

Proposed Names

27% (2)
Eye3
Recognized by sight
61% (2)
Eyes3
Recognized by sight
30% (2)
Used references: ¨Checklist of lichens of Australia and surrounding islands¨:http://www.anbg.gov.au/...
¨Líquenes de la Provincia del Chubut¨ by Oscar Pérez de la Torre, 2011. ISBN 978-987-1412-28-0

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Eye3 = Observer’s choice
Eyes3 = Current consensus

Comments

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I agree with Zaca
By: Jason Hollinger (jason)
2012-11-09 17:18:07 CST (-0500)

The sterile one in the last photo looks very different. Still looks like Collema, though. Definitely not Leptogium, I’d say. But don’t forget the Lichinales, as well, like Lichinella.

It doesn’t bode well for tu amigo Oscar if he only lists a single species of Collema in the entire province! Does he talk about where most work had been done? Was Valdes well-studied? If not, is there reason to suspect a divergent flora, say, unusual geology for the province? I’m wondering if it may be perfectly useful for other regions, but less so for yours. Or maybe he neglected certain groups. (And, no offense to Zaca!, Collemataceae is a common group to neglect, understandably. :)

Collema key…
By: nastassja (Nastassja Noell)
2012-11-08 17:40:32 CST (-0500)

It does look like Collema tenax could also be ¨C. laeve¨:http://www.anbg.gov.au/... which is the only Collema on the list for the Chubut Province… but hard to tell if there is isidia present or pruinia on the apothecia by this photo (next time I´ll take notes! :). Interestingly, Collema tenax is not on the ¨Australian lichen checklist¨:http://www.anbg.gov.au/...

Aside from C. laeve the only other Collemataceae listed for the Chubut Province by Oscar Pérez de la Torre is:
Leptogium azureum
L. menziesii (apothecia on this one looks smaller than specimen, margin is smooth not bumpy)
L. valdivianum (not leaden gray when dry, as decribed ¨here¨:http://journals.cambridge.org/... )

I wish I could be
By: zaca
2012-11-08 16:46:58 CST (-0500)

an expert in Collema, since material does not lack for here, but four the time being I’m just an observer. Related to this observation I agree with Jason; It seems very similar to some material I found of C. tenax in sand dunes, particularly the forms of apothecia and isidia. I only have some doubts about the one in the last photo, because there are no apothecia, the lobes seem to be different shaped (maybe because they are dry) and no isidia is perceptible (maybe caused by the overlap of sand).

Definitely Collema
By: Jason Hollinger (jason)
2012-11-08 02:47:46 CST (-0500)

This is one of the group of Collema with thick margins. Isn’t C. tenax one of those? I’m hopeless with Collema. Spores can help a lot. Zaca is the resident expert with this group, hands down.

Created: 2012-11-07 19:27:19 CST (-0500)
Last modified: 2012-11-09 17:18:33 CST (-0500)
Viewed: 41 times, last viewed: 2015-07-28 13:18:17 CDT (-0400)
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