Arthonia farinacea (H. Olivier) R. Sant.

Svensk Not. Tidskr., 54, 4: 501, 1960.. Basionym: Melaspilea farinacea H. Olivier - Bull. Acad. Intern. Géogr. Bot., 16: 195, 1906.
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Description: Thallus inapparent, not lichenized, developing inside the soralia of R. farinacea and related species. Apothecia arthonioid, black, immarginate, with a rough surface, more or less round, convex, 0.2-0.3 mm across. Proper exciple not developed; epithecium dark brown, 10-20 µm high; hymenium colourless, 30-35 µm high, I+ reddish, K/I+ blue; paraphysoids branched and anastomosing, c. 1 µm thick, the apical cells up to 4 µm wide, with a dark cap; hypothecium brown, 40-60 µm high. Asci 8-spored, broadly clavate, semi-fissitunicate, with a large apical dome, a distinct ocular chamber, and a K/I+ blue ring-structure, Arthonia-type. Ascospores (1-)2-septate, hyaline, narrowly ellipsoid, 10-16 x 2.5-4.5 µm, without an epispore. Photobiont absent. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a lichenicolous fungus developing on the soralia of Ramalina farinacea. Never reported for, and and to be looked for in Italy.
Growth form: Lichenicolous fungus
Substrata: bark
Reproductive strategy: mainly sexual
paras Ramalina farinacea



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Smithsonian Institution, National Museum of Natural History, Department of Botany https://collections.nmnh.si.edu/search/botany/?irn=2871699 CC BY-SA 3.0