Observation 105749: Arthonia stellaris Kremp.

When: 2012-08-08

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

Who: zaca

No specimen available

Steps in the key of the British Flora leading to the proposed name:

Not Lichenicolous;
Ascospores 2- or more septate;
Apothecial sections not K+ purple, violet or magenta;
On bark;
Hypothecium <50 µm, colorless or pale;
Ascospores mostly <26 µm long, <10 µm wide;
Ascospores more than 12-14 µm long (average dimensions observed: Me = 16.9 × 5.7 µm ; Qe = 3 (N=17));
Apothecia not pruinose;
Apothecial sections C- (presumably, not tested);
Apothecial linear to stellate;
—> Arthonia stellaris.

There are not many photos available of this species; The one in British liichens is very similar to my specimens.

Arthonia elegans is very close and differs by having apothecia dull red to purple brown and epithecium K+ purple or blue-violet.


Chemical reactions;

Proposed Names

58% (1)
Eye3 Eyes3
Used references: Smith et al., The Lichens of Great Britain and Ireland, The British Lichen Society, 2009.
Based on microscopic features
Based on chemical features

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2012-08-17 16:18:16 PDT (-0700)
Last modified: 2012-08-17 16:18:19 PDT (-0700)
Viewed: 82 times, last viewed: 2018-03-05 23:05:04 PST (-0800)
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