ITALIC 7.0

Kuettlingeria xerica (Poelt & Vězda) I.V. Frolov, Vondrák & Arup

in Frolov & al., J. Syst. Evol. 59, 3: 468, 2020. Basionym: Caloplaca xerica Poelt & Vězda - in Poelt, Mitt. bot. Staatss. München, 12: 2, 1975.

Synonyms: Caloplaca xerica Poelt & Vězda; Caloplaca xerica var. venostana Poelt

Distribution: N - TAA (Wetmore 1996), Piem (Clerc & al. 1999), VA (Piervittori & Isocrono 1999). S - Cal (Herb. Vondrák 10756), Si (Herb. Vondrák 10851).

Description: Thallus crustose, episubstratic, dark grey to almost black, epruinose, indistincly areolate-cracked, rather thick (150-600 μm), the older parts blastidiate, the blastidia 100-350 μm in diam. Apothecia zeorine, subsessile, 0.4-0.8 mm across, with a flat to slightly convex, orange-brown disc, a thin, paler, orange-yellow proper margin, and a poorly developed, soon excluded, grey thalline margin. Thalline exciple 110-180 μm wide; proper exciple continuing in the lowermost part of the hypothecium, 70-110 μm wide laterally; epithecium orange-brown, K+ red; hymenium colourless, 60-90 μm high; paraphyses mostly simple, 1-1.5 μm thick at base, the apical cells only slightly swollen, c. 2.5 μm wide; hypothecium colourless. Asci 8-spored, broadly clavate, Teloschistes-type. Ascospores 2-celled, polarilocular, hyaline, ellipsoid, (11-)14-18(-19) x 5.5-9 μm, the equatorial thickening (“septum”) (2.5-)3-6 μm. Photobiont chlorococcoid. Spot tests: thallus K- or K+ faintly violet, C- or C+ violet, KC-, P-; disc of apothecia K+ red, C+ red. Chemistry: thallus with the sedifolia-grey pigment; apothecia with fragilin (major), 7-chloremodin, emodic acid, parietin, and fragilin (minor or traces). The var. venostana Poelt has black apothecia devoid of anthraquinones.

Note: on weathered basic siliceous rocks, both in the dry Mediterranean zone and in dry-continental Alpine valleys; perhaps more widespread in Eurasia; the var. venostana differs in the blackish apothecial disks.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

Alpine belt: absent

Subalpine belt: absent

Oromediterranean belt: absent

Montane belt: very rare

Submediterranean belt: extremely rare

Padanian area: absent

Humid submediterranean belt: absent

Humid mediterranean belt: absent

Dry mediterranean belt: very rare

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