ITALIC 7.0

Verrucaria zschackei Riedl

Linzer biol. Beitr., 22, 1: 154, 1990

Synonyms:

Distribution:

Description: Thallus crustose, episubstratic or hemiendosubstratic, 25-100 μm thick, continuous to finely rimose around the perithecia, grey, somehow glossy, smooth. Medulla white, sometimes with a 20-40 μm thick, black basal layer. Perithecia black, c. 0.2 mm across, hemispherically projecting, largely covered with a thin thalline layer. Involucrellum usually covered by a thalline layer, reaching to base-level, adpressed to exciple but with spreading flanks, the area between involucrellum and exciple filled by enlarged cells with brown-black walls; exciple 0.12-0.18 μm across; hamathecium of very short, up to 10 μm long periphyses and periphysoids, 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 17-24 x 7-12 μm, not halonate. Photobiont chlorococcoid, the cells not arranged in vertical columns. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on calcareous rocks along streams, widespread in Central Europe, with scattered records from the Alps, outside Italian territory. To be looked for in Italy

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Periodically submerged (e.g. in creeks)

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