Caloplaca nubigena var. keissleri (Servít) Clauzade & Cl. Roux

Bull. Soc. linn. Provence, 30: 27, 1978 (“1977”). Basionym: Blastenia keissleri Servít - Hedwigia 74: 149, fig. 4, 1934.
Synonyms: Caloplaca keissleri (Servít) Poelt
Distribution: C - Marc (Nimis & Tretiach 1999), Abr (Nimis & Tretiach 1999, Gheza & al. 2021).
Description: Thallus crustose, endosubstratic and usually evident only as a faint discolouration of the rock, forming 1-2 cm wide, more or less orbicular, often confluent patches. Apothecia 0.2-0.3 mm across, completely immersed in shallow pits of the rock, with a dark orange, usually flat to slightly convex disc, and a thin, slightly paler proper margin, without thalline margin. Epithecium orange-brown, K+ red; hymenium colourless, 60-70 µm high; paraphyses simple or sparingly branched, the apical cells swollen, to 6 µm wide; hypothecium colourless. Asci 8-spored, clavate, Teloschistes-type. Ascospores 1-septate, polarilocular, hyaline, ellipsoid, 11-13.5 x 5-6 µm, the septum 3.5-4 µm thick. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; apothecia K+ red. Chemistry: apothecia with unidentified anthraquinones.
Note: a non-lichenicolous taxon with an endolithic thallus indicated by usually whitish patches, and sunken orange apothecia with slightly concave discs and thin parathecial margin (overall aspect recalling somewhat Protoblastenia incrustans); doubtfully distinct from the typical variety, it could be just a form poor in anthraquinones.
Growth form: Crustose endolithic
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
paras Clauzadea immersa

Commonnes-rarity: (info)

Alpine belt: rather rare
Subalpine belt: rather rare
Oromediterranean belt: very rare
Montane belt: extremely rare
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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Poleotolerance:

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Altitudinal distribution:

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E. Pittao
TSB 25211



P.L. Nimis
TSB 19335