Collection location: Planalto das Cezaredas, Portugal [Click for map]
The macroscopic features of this specimen are well documented in the attached photos. The microscopy revelead that this species has:
- 2-spores/ascus (all that I found),
- the spores with average dimensions: Me = 124.8 × 42.5 µm ; Qe = 2.9 (N=22),
- Some of the spores are striate (wavy ?).
According to 1 the following species growing on bark, with verrucas and with 2-spores/ascus exist in Europe:
Group 13 (smmoth spores): P. ficorum, P. pertusa, P. pustulata, P. servitiana;
Group 14 (rough spores): P. dispar, P. heterochroa.
I only considered Group 13 because no obvious choice results from Group 14, for which the data mentioned pointed. However, the dimensions of the spores seem to eliminate all the alternatives in Group 13. The dimension of the spores for the two species in Group 14, clearly eliminates P. dispar (80-110 µm long) and also seems to eliminate P. heterochroa (90-120 µm long). But key 2 gives a wide range of variation for the dimensions of the spores: (50-)70-110(-170) x 25-60 µm. In 2 the same chemistry for these two species is mentioned: C+ pinkish red, and in addition, for P. heterochroa, C- in ostioles and a long list of lichen substances: thiophaninic, stictic, and traces of norstictic, constictic acids, 0-methylmonochlorlichexanthone. I seems that this doesn’t apply to my specimen (see the attached photos with the chemical reactions).
So, once again nothing positive cames out by the use of the keys available for this genus..
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Created: 2012-03-15 01:40:34 SAST (+0200)
Last modified: 2012-03-15 01:40:38 SAST (+0200)
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