Observation 96958: Caloplaca cerina (Hedwig) Th. Fr.
When: 2012-06-09
Who: zaca
No herbarium specimen

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Microscopy added.
By: zaca
2012-06-12 14:43:16 CDT (-0500)

I made the microscopy for this specimen, using a mount in a solution of floxine B. I became surprised with the sizes of both spores and the corresponding septa, bigger than the indicated in CNALH for the species C. cerina. This time I could observe well the spores, the asci and the paraphyses, which according to that source are “with some branching or frequently branched”. Looking for more information, I got aware of a recent paper published in “The Lichenologist” (available here). The authors study the Caloplaca cerina group, which is defined as a monophyletic, but internally richly branched lineage. Several species are identifyed, but concerning C. cernina s. lat they consider this as a polyphyletic taxon which, according to the key given, can be separated from the other species in the group by living on trees, having a thallus without any vegetative diaspores and an ascospore septum wider, 4.0-7.0. Within C. cerina s. lat the division is made in clades A to D, the last one further divided into D1 to D3. The clade D is the one having bigger ascospores and septum:
“ascospores (11–) 14·6 ± 1·7 (–20) × (6–) 7·9 ± 0·9 (–10) µm; septum (5–) 6·7 ± 1·2 (–10) µm wide (n = 90)”.
I believe that my specimen falls into this clade. I got the following average dimensions for the spores (where only one spore has a lenght below 14 µm):
Me = 14.8 × 8 µm ; Qe = 1.9 (N=31).

References:
CNALH, Lichenologist 43: 113-135.

Created: 2012-06-10 15:41:04 CDT (-0500)
Last modified: 2012-06-10 15:41:07 CDT (-0500)
Viewed: 53 times, last viewed: 2016-10-25 06:53:59 CDT (-0500)
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