ITALIC 8.0

Verrucaria fraudulosa Nyl.

Flora, 64, 12: 181, 1881

Synonyms:

Distribution:

Description: Thallus crustose, episubstratic, 0.2-0.6 mm thick, areolate, sharply delimited, often with a black prothallus, the areoles obtusely angular, usually contiguous, flat to slightly convex, 0.3-1(-1.5) mm wide, grey-brown to dark brown or brown-black, dull, more or less smooth, the steep side-walls and the margins pale. Cortex paraplectenchymatous, poorly developed, with a brownish uppermost part, sometimes overlain by a thin epinecral layer; algal layer subparaplectenchymatous, filling most of thallus; medulla dark brown, but not forming a black basal layer. Perithecia marginal or located between the areoles, c. 2/3 immersed, the apical part hemispherically to conically projecting, 0.2-0.3 mm across. Involucrellum homogeneously 30-40 µm thick, contiguous with exciple, extending to base-level and more or less incurved beneath the exciple; exciple subglobose, 15-20 µm thick, 0.2-0.35 mm across, the wall colourless to brown; hamathecium of 20-25 µm long periphysoids, interascal filaments absent; hymenial gel hemiamyloid, I+ red (I+ blue at very low concentrations of I), K/I+ blue. Asci 8-spored, narrowly clavate, I-, fissitunicate, the wall thickened above, Verrucaria-type, 60-70 x 15-20 µm. Ascospores 1-celled, hyaline, narrowly ellipsoid, 13-17(-18) x (5-)6-7.5 µm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a poorly known species found on steeply inclined surfaces of more or less calciferous rocks, known for Central Europe and from scattered localities in the Alps (outside Italian territory), and there from the subalpine to the alpine belt. It probably belongs to the Verruculopsis lecideoides-aggregate (see Roux & Coll. 2025).

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

INDEX FUNGORUM GBIF

Source: Servít M. Nové a málo známé druhy z čeledí Verrucariaceae a Dermatocarpaceae. Preslia 24: 245-390, 1952, Tab.1 – Public Domain