ITALIC 8.0

Rhizocarpon geographicum subsp. kittilense (Räsänen) Ahti

Norrlinia, 17: 57, 2008. Basionym: Rhizocarpon kittilense Räsänen - Ann. Bot. Soc. Zool.-Bot. Fenn. Vanamo, 19: 58, 1942.

Synonyms: Rhizocarpon lindsayanum subsp. kittilense (Räsänen) Runemark; Rhizocarpon olivetorum Räsänen; Rhizocarpon riparium Räsänen

Distribution: N - Piem, VA, Emil (Fariselli & al. 2020).

Description: Thallus crustose, episubstratic, greyish-green to yellow-green, areolate, forming 5-10 cm patches delimited by a black prothallus, the areoles contiguous, round to angular, 0.6-2.5 mm wide, flat to slightly convex, epruinose, usually subdivided by numerous shallow cracks. Cortex 25-40 µm thick, without a distinct structure, with abundant small crystals insoluble in K; medulla white, I+ blue. Apothecia frequent, lecideine, arising between the areoles, round, 0.6-2.5 mm across, with a black, weakly concave to weakly convex, epruinose disc and a very thin, usually persistent and slightly raised, sometimes finally excluded proper margin, only the inner parts of the apothecial bases filled with blackish hyphae. Proper exciple pale brown to brownish red; epithecium brown, K-; hymenium 120-200 µm high, colourless to greenish, K/I+ blue, K+ greenish; paraphysoids strongly coherent, richly branched and anastomosing, the apical cells sometimes slightly capitate; hypothecium dark brown, K-. Asci 8-spored, clavate, fissitunicate, with a well-developed tholus that is K/I- in lower part and K/I+ blue near the apex, lacking an ocular chamber, Rhizocarpon-type. Ascospores muriform, with 12-17 cells visible in optical view, soon becoming dark green to brown, ellipsoid, (24-)26-43 x 13-22 µm, halonate at least when young. Photobiont chlorococcoid. Spot tests: medulla K-, C-, KC-, P- or P+ yellow. Chemistry: cortex with rhizocarpic acid, medulla with variable amounts of psoromic acid.

Note: on steeply inclined surfaces of siliceous rocks in rather sheltered and humid situations, from the subalpine to the nival belt.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: rather rare

Subalpine belt: rare

Oromediterranean belt: absent

Montane belt: absent

Submediterranean belt: absent

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: absent

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

Herbarium samples

INDEX FUNGORUM GBIF DOLICHENS