Notes: Some features of the present specimen:
- Growing on siliceous rock pieces;
- Thallus: dark, greyish/brownish, wrinkly;
- Apothecia: with a very generous white rim, disc dark-orange/red some with a white pruina;
- Chemical: all negative in thallus and on apothecia, except a very weak K+y on the rim;
- Microscopy: asci 4-spored (I presume), spore with average dimensions: Me = 53.5 × 34.8 µm ; Qe = 1.6 (N=9), younger asci in form of rocket and with very dark material inside before spores are formed, mature asci more clavate; younger spores sub-globose and darker than mature spores, which are ellipsoidal.
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I think maybe it’s because of dead cortex covering the surface (an “epinecral” layer). The most reliable method seems to be: slice an apothecium vertically, then under the dissecting scope apply minute quantities of C to the cortex and medulla of the rim and the surface of the hymenium. The highest concentrations of lichen substances seems to occur around apothecia and soralia (when present). I misidentified countless Ochrolechia before discovering this the hard way.
Created: 2011-10-12 19:41:47 CEST (+0200)
Last modified: 2011-10-12 19:41:50 CEST (+0200)
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