Lepra melanochlora (DC.) Hafellner

in Hafellner & Türk, Stapfia, 104: 172, 2016. Basionym: Isidium melanochlorum DC. in Lamarck & de Candolle - Fl. Franç., 3 éd., 2: 326, 1805.
Synonyms: Pertusaria melanochlora (DC.) Nyl.
Distribution: C - Tosc, Laz (Tretiach 2004), Sar (Monte 1993).
Description: Thallus crustose, episubstratic, 1-3 mm thick, continuous to rimose or indistinctly areolate, grey to dark grey, densely covered with isidia-like, 2-3 mm long, 0.5-1.5(-2) mm wide, simple or sparingly branched papillae which are flat to concave and somewhat paler at the top. Apothecia rare, immersed in 2-4 mm wide fertile papillae, 1-5 per papilla, with an initially punctiform, then expanded, 1.5-2 mm wide, black but often white-pruinose disc, and a prominent, wrinkled thalline margin. Epithecium dark brown, K-; hymenium colourless, 250-350 µm high; parapahyses sparingly branched, 1.5-2 µm thick; hypothecium colourless. Asci 1-spored, broadly cylindrical, the apex with a broad ocular chamber, the outer sheath K/I+ blue, otherwise K/I-, Pertusaria-type. Ascospores 1-celled, hyaline, ellipsoid, 180-260(-300) x 70-130(-200) µm, the wall c. 22 µm thick, smooth. Pycnidia black, immersed. conidia cylindrical, 4-5 µm long. Photobiont chlorococcoid. Spot tests: thallus K+ yellowish brown, C-, KC+ fleeting violet, P+ orange-red, UV-; medulla with a strongly bitter taste. Chemistry: picrolichenic and protocetraric acids.
Note: a probably Mediterranean-Atlantic, very poorly known and often misunderstood taxon (e.g. confused with L. mammosa), found on compact siliceous rocks, usually below the montane belt. Several earlier records reported by Nimis (1993: 516) are not accepted here.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)
Poorly known taxon in need of further study

Commonnes-rarity: (info)

Alpine belt: absent
Subalpine belt: absent
Oromediterranean belt: absent
Montane belt: absent
Submediterranean belt: absent
Padanian area: absent
Humid submediterranean belt: extremely rare
Humid mediterranean belt: very rare
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


P.L. Nimis CC BY-SA 4.0 [17240], Brazil. São Paulo. Praia de Peruibe near Itanhaém, in a dense mangrove forest on Laguncularia racemosa, 2 m, 24°10' S, 46°50' W. Leg. K. Kalb 24.02.1978 (Nr. 37602), det. K. Kalb. Dupl. ex Herbario Klaus Kalb. TSB 20878



P.L. Nimis CC BY-SA 4.0 [17240], Brazil. São Paulo. Praia de Peruibe near Itanhaém, in a dense mangrove forest on Laguncularia racemosa, 2 m, 24°10' S, 46°50' W. Leg. K. Kalb 24.02.1978 (Nr. 37602), det. K. Kalb. Dupl. ex Herbario Klaus Kalb.
TSB 20878