Observation 89353: Pertusaria DC.

When: 2012-03-03

Collection location: Planalto das Cezaredas, Portugal [Click for map]

Who: zaca

No specimen available

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 ?).

I used the following two keys:
1 World-wideGroup 13 and Group 14.
2Europe and the Mediterranean.

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..

Proposed Names

58% (1)
Eye3 Eyes3
Based on microscopic features: See Notes.
Based on chemical features

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
No one has commented yet.

Created: 2012-03-15 01:40:34 SAST (+0200)
Last modified: 2012-03-15 01:40:38 SAST (+0200)
Viewed: 55 times, last viewed: 2017-06-10 17:51:37 SAST (+0200)
Show Log