Buellia stellulata (Taylor) Mudd

Man. Brit. Lich.: 216, 1861. Basionym: Lecidea stellulata Taylor in J. Mackay - Fl. Hibern., 2: 118, 1836.
Synonyms: Buellia maritima (A. Massal.) Bagl.; Buellia minutula (Hepp) Arnold; Buellia stellulata var. candidella (Nyl.) Boistel; Buellia subalbula var. adriatica Zahlbr.; Catolechia maritima A. Massal.; Lecidea candidella Nyl.; Lecidea microtera Nyl.
Distribution: N - TAA, Lomb, Piem (Favero-Longo & al. 2015), VA (Piervittori & Isocrono 1999), Lig (Lazzarin 2000b). C - Tosc, Laz, Sar (Scheidegger 1993, Rizzi & al. 2011). S - Camp (Nimis & Tretiach 2004, Garofalo & al. 2010), Pugl (TSB 7645), Bas, Cal (Puntillo 1996), Si (Grillo & Caniglia 2004).
Description: Thallus crustose, episubstratic, rimose, whitish, forming small orbicular patches to 1 cm in diam.; medulla white, not amyloid, I-. Apothecia black, cryptolecanorine to lecideine, 0.1-0.3 mm across, innate, with a flat to convex disc and a thin, finally excluded proper margin. Proper exciple very thin, dark brown to brown-black in outer part, N-, aethalea-type; epithecium olive-green to olive-brown, N+ reddish; hymenium colourless, without oil droplets, 45-70 µm high; hypothecium dark brown. Asci 8-spored, Bacidia-type. Ascospores 1-septate, brown, oblong, not constricted at septum, 10-13 x 5-6 µm, Buellia-type, with a rugulate ornamentation, rarely smooth, especially when young. Pycnidia flask-shaped, black, immersed in thallus. Conidia bacilliform, 3.5-5 µm long. Photobiont chlorococcoid. Spot tests: thallus K+ yellow, C-, KC-, P- or P+ faintly yellow. Chemistry: atranorin, confluentic and 2'-O-methylperlatolic acids.
Note: a mild-temperate to subtropical lichen found on calciferous and base-rich, hard siliceous rocks (e.g. on basalt), both near the coast in Mediterranean Italy, and in dry-warm Alpine valleys.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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


pH of the substrata:

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Poleotolerance:

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Manuel Gil
Spain, Canary Islands, Lanzarote



P.L. Nimis; Owner: Department of Life Sciences, University of Trieste
Herbarium: TSB (32354)
2003/03/10