ITALIC 8.0

Rhizocarpon sublavatum Fryday

Lichenologist, 32: 214, 2000.

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Distribution:

Description: Thallus crustose, episubstratic, rimose-areolate, grey-brown, usually delimited by a black prothallus. Areoles mostly flat, contiguous. Apothecia lecideine , black, epruinose, 0.3-0.6 mm across, at first innate, then sessile, with a mostly flat disc and a thin proper margin. Exciple brownish K-, sometimes with a green pigment reacting N+ red in upper part; epithecium olive-green to olive-brown, K-; hymenium colourless, 120-140 μm high, I+ blue, paraphysoids slender, scarcely swelling at apex, without a strongly delimited pigmented cap; hypothecium medium to dark brown. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, hyaline (rarely pigmented when overmature) narrowly ellipsoid to ellipsoid, 17–38 x 11-25 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: without lichen substances.

Note: a species resembling Rh. reductum in the small apothecia and the eumuriform ascospores, but thallus with flat areoles, lacking lichen substances; on damp siliceous rocks, often along streams, occasionally together with Rh. lavatum (with larger areoles and apothecia); widespread in Europe, from the boreal to the nemoral-alpine zones, with a single record from the Eastern Alps (Austria), but the species was not recognised in earlier times, and might be present also in the Italian Alps.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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Solar irradiation:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Herbarium samples

Index Fungorum GBIF

Einar Timdal CC BY-NC

Einar Timdal - CC BY-SA NC