Specimen growing on exposed rock.
The following features were used to key out this specimen as Buellia leptoclinoides, using the key within British Flora (see the reference):
- Thallus not immersed in lichens or on crustose lichens;
- Thallus without soradia;
- On rock;
- Apothecia supericial at maturity;
- Thallus C-
- Thallus K+ yellow (persistent);
- Hymenium with numerous oil droplets (presumably, at least is not clear);
- Ascospores 14.5-23.5 × 6.5-11.5.
I obtained the following average dimensions for the spores:
Me = 20 × 11.1 µm ; Qe = 1.8 (N=25).
This species is the one with bigger spores among those with the same initial features in the key. Some close species can be separated by chemistry, e.g. B. subdisciformis (K+ yellow to red), B. saxorum (C+ red), B. spuria (K+ yellow-orange). The similar B. leptocline has smaller and narrow spores.
This specimen has a pure grey thallus with a black prothallus whereas in the description of B. leptoclinoides a pale yellow-grey thallus is mentioned and the prothallus is not referred.
Unfortunately I was not able to find photographs of this species.
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Created: 2012-08-02 16:24:31 PDT (-0700)
Last modified: 2012-08-03 12:41:26 PDT (-0700)
Viewed: 50 times, last viewed: 2017-11-24 02:39:39 PST (-0800)