Neocatapyrenium radicescens (Nyl.) Breuss

Ann. naturhist. Mus. Wien, 98B: 40, 1996. Basionym: Verrucaria radicescens Nyl. - Bull. Soc. Bot. France, 10: 267, 1863.
Synonyms: Catapyrenium radicescens (Nyl.) Breuss; Dermatocarpon pachylepis (Anzi) Zahlbr.; Endocarpon pachylepis Anzi
Distribution: N - Lomb.
Description: Thallus squamulose, of contiguous to overlapping, 2-5 mm wide, sinuous to sublobate, grey-brown squamules forming flattened to slightly convex pillows up to 4 cm in diam. Lower surface black, paler at margins, without rhizohyphae, attached by up to 1,5 mm thick and to 20 mm long, simple or sparingly branched, black rhizines. Upper cortex paraplectenchymatous, 40-60 µm thick, of 5-8 µm wide cells; medulla white, prosoplectenchymatous, to 300 µm thick. Perithecia black, pyriform, up to 0.4 mm across, immersed in the squamules, without involucrellum. Perithecial wall up to 40 µm thick, with a pigmented outer layer and a colourless inner layer; periphyses 40-50 x 2-3 µm. Asci 8-spored, clavate, the wall I-, with biseriately arranged spores. Ascospores 1-celled, hyaline, broadly ellipsoid. 14-18 x 9-10.5 µm. Pycnidia laminal, immersed in the squamules, up to 400 µm wide, rounded to cerebriform. Conidia cylindrical, 7-11 x 1-1.5 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P- UV-. Chemistry: without lichen substances.
Note: on more or less fissured siliceous rocks near or above treeline; hitherto known only from southern France, Italy and Switzerland.
Growth form: Squamulose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: extremely rare
Subalpine belt: extremely 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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Aridity:

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Source: Breuss O. 1990. Die Flechtengattung Catapyrenium (Verrucariaceae) in Europa. Stapfia, 23: 1-153.