ITALIC 8.0

Rhizocarpon schedomyces Hafellner & Poelt

Herzogia, 4, 1-2: 7, 1976.

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Distribution:

Description: Thallus crustose, brownish grey, continuous to rimose, sometimes inapparent, poorly delimited, forming 1-2 mm wide, finally often confluent patches on the thalli of epilithic Pertusaria-species. Thallus hyphae I+ blue. Apothecia lecideine, black, round, immersed to sessile, 0.2-0.4(-0.7) mm across, with a slightly convex, rough disc and a thin, finally excluded proper margin. Proper exciple thin, of radially arranged hyphae, reddish brown; epithecium reddish brown, 15-20 μm high; hymenium colourless, 80-110 μm high; paraphysoids 1.5-2 μm thick at mid-level, the apical cells up to 3 μm wide; hypothecium brown-black, up to 120 μm high. Asci (4-6-)8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores 1-septate, at first hyaline but soon turning grey to brown-black, ellipsoid, 20-28 x 9.5-12 μm, distinctly halonate. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: thallus without lichen substances.

Note: a species with a mainly endothalline thallus visible around the apothecia as a greyish-brownish discoloration and 1-septate, pigmented ascospores; on weakly calciferous schists or basic siliceous rocks, obligately parasitic on saxicolpous Pertusaria (e.g. P. pseudocorallina), forming minute insular patches; so far only known from the Eastern Alps (Austria); to be looked for in the Italian Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

paras Pertusaria-species

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Poleotolerance:

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Predictive model

Index Fungorum GBIF