Arthonia fuliginosa (Turner & Borrer) Flot.

Bot. Z., 8: 569, 1850. Basionym: Spiloma fuliginosum Turner & Borrer in Schaer. - Naturw. Anz. allg. Schweiz. Ges. Naturw., 5: 33, 1821.
Distribution: N - Frl, TAA (Nascimbene & al. 2007b).
Description: Thallus crustose, thin, usually continuous, grey-white to pale yellowish, Apothecia arthonioid, at first rounded, then ellipsoid, flat to slightly convex, to 1 mm across, angular or lobed, brown-black but usually white-pruinose at least in the marginal zone, often aggregated into star-shaped clusters. Proper exciple poorly developed; epithecium brownish; hymenium colourless, 50-70(-100) µm high; hypothecium colourless. Asci 8-spored, broadly clavate, semi-fissitunicate, with a large apical dome and a distinct ocular chamber, Arthonia-type. Ascospores 3-4-septate, hyaline, sole-shaped (with unequal cells), (12-)15-22 x 6-8(-9) µm. Photobiont trentepohlioid. Spot tests: thallus K- or K+ lemon yellow, C-, KC-, P-. Chemistry: unknown.
Note: a mild-temperate species of acid bark, especially of Abies, in humid montane forests. It is included in the Italian red list of epiphytic lichens as “Endangered” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: extremely rare
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: absent
Humid mediterranean belt: absent
Dry mediterranean belt: absent

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

P.L. Nimis CC BY-SA 04
TSB 15073

Redinger, K. (1938) Arthoniaceae, Graphidaceae . In Kryptogamen-Flora von Deutschland, Österreich und der Schweiz. Band 9, 2 Abt., Part 1 (G. L. Rabenhorst, ed.): 181–404. Leipzig: Borntraeger

P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (15073)