Notes: In the British Flora (and by extension I believe the same happens here) only two species of Arthonia are cited to have apothecial sections K+ purple, violet or magenta: A. cinnabarina and A. elegans. Taken into account my previous observations and the features of these speciens, I thought that it belong to the first of that species. Moreover, despite the similarity referred for the two species, the apothecia of the first is usually (white) pruinose specially at the margin of apothecia, where the pruina is cinnabar-red, while the second is usually not pruinose or with pruina along the edges. This specimen is pruinose, having both white pruina and red pruina (mainly at margin) on apothecia. The spores of the two species are similar in shape but very different in dimensions and septation:
A. cinnabarina: (18) 20-28 × 7-9.5 um; (2) 4 to 5 (6) septa;
A. elegans: (12) 14 – 19 × 4.5-7 um; (2) 3 or 4 (5) septa.
For my specimen I obtained:
(13.4) 13.8 – 15.9 (16.3) x (4.8) 4.9 – 5.7 (6) µm; Q = (2.3) 2.5 – 3 (3.1) ; N = 25; Me = 14.9 × 5.3 µm ; Qe = 2.8; Most spores with 3 septa.
Therefore, I believe this can be classified as A. elegans, despite of having pruinose apothecia.
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Created: 2014-11-13 14:46:13 PST (-0800)
Last modified: 2014-11-13 14:53:42 PST (-0800)
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