ITALIC 8.0

Verrucaria fuscovelutina Servít

Acta Mus. Nat. Prag., 5B, 9, Bot. 3: 26, 1949.

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Distribution:

Description: Thallus crustose, thinly episubstratic, rimose-areolate, 0.15-0.25 mm thick, sometimes delimited by a thin black prothallus, the areoles pale dirty grey-brown to dark brown, 0.1-0.2 mm wide when sterile, up to 0.7 mm wide when fertile, polygonal, flat to slightly convex, separated by thin fissures. Cortex very thin; algal layer 40-60 μm thick; medulla white to brownish at base (especially near the perithecia), not forming a black basal layer. Perithecia black, c. 80-100/cm², 1 per areole, immersed into shallowly conical to convex areoles, projecting with the c. 0.3 mm wide, naked upper part. Involucrellum reaching down at least 2/3 of the perithecium, sometimes extending to base-level, appressed to exciple, 40-50 μm thick in upper part, broadening to 80-100 μm in lower part; exciple 0.25-0.3 mm across, the wall 15-20 μm thick, pale to dark brown, K+ olive-green; hamathecium of mostly simple, stout periphysoids measuring 15-25 x c. 3 μm, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, with an ocular chamber, dehiscent by extrusion of an endotunica to form a delicate rostrum, Verrucaria-type. Ascospores 1-celled, hyaline, ellipsoid, 20-25 x 9-12 μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a calcicolous species resembling V. endocarpoides, which differs in the immersed perithecia and the larger areoles, described from Montenegro and later reported from several localities in Southern and Central Europe, with a single record from the Eastern Alps (Austria) at low elevation. For further details see Breuss & Berger (2010). To be looked for in Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Poorly known taxon in need of further study

pH of the substrata:

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Solar irradiation:

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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Source: Servit, M 1949: Nove nebo mene zname druhy lisejnikove celedi Verrucariaceae. Species Verrucariacearum (Lichenes) novae vel minus cognitae. - Sbornik Narodniho Musea v Praze 5(9): 1-51. Tab.1 - Public Domain