ITALIC 7.0

Rhizocarpon mosigiae Poelt & Obermayer

Herzogia, 11: 111, 1995.

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Description: Thallus crustose, areolate, dull violet-grey, epruinose, usually without a distinct prothallus, forming 2-10 mm wide, orbicular islands on the thalli of Rimularia gibbosa. Areoles contiguous, sharply angular, 0-2-0.5 mm wide, flat to irregularly convex. Medulla white, I+ blue in basal parts. Apothecia lecideine, black, usually crowded in central parts of thallus, slightly prominent, at first flat and thinly marginate, but soon strongly convex and immarginate. Epithecium reddish brown, to brown-black, K+ purple-violet; hymenium colourless, c. 150 μm high; paraphysoids scarcely swelling at apex, without a strongly delimited pigmented cap; hypothecium brown-black. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores 1-septate, at first hyaline, then blue-grey to brown, ellipsoid, straight or slightly curved, 17-22(-24) x 8-9.5(-10.5) μm, with a c. 4 μm thick halo. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-, UV-. Chemistry: thallus without lichen substances.

Note: a species resembling the Mediterranean Rh. epispilum, but thallus grey and ascospores somewhat smaller; obligately parasitic of Rimularia gibbosa on siliceous boulders at high elevations; 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 Rimularia gibbosa

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Predictive model

Index Fungorum GBIF