Lepra graeca (Erichsen) Hafellner

in Hafellner & Türk, Stapfia, 104: 171, 2016. Basionym: Pertusaria graeca Erichsen. - Rabenh. Krypt.-Flora, 9, 5, 1: 624, 1936.
Synonyms: Pertusaria graeca Erichsen
Distribution: C - Sar.
Description: Thallus crustose, episubstratic, whitish grey, 1-2 mm thick, with an uneven to verrucose-papillate surface, without a distinct prothallus. Sterile warts papilliform, isidia-like, 0.5-1 mm thick and high, constricted at base, with a regularly round, somewhow paler apical part; fertile warts larger, 1.5-3 mm wide, up to 1 mm high, convex, some of them bearing apothecia, some sometimes bearing soralia. Apothecia immersed at the top of fertile warts, often confluent, forming a round to irregularly shaped, 1-1.5 mm wide, reddish but white-pruinose disc surrounded by a slightly raised thalline margin. Epithecium almost colourless to pale grey; hymenium colourless, 270-480 µm high; paraphyses 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, narrowly ellipsoid, 160-280 x 50-80 µm, the wall 5-9 µm thick, smooth. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P-; upper part of medulla and apothecial disc K+ brownish yellow, P+ yellow turning red. Chemistry: fumarprotocetraric acid, sometimes with variable amounts of succinprotocetraric or protocetraric acids.
Note: an eu-Mediterranean epiphytic species known from Corsica, Sardegna and Greece, much misunderstood in the past, whose ecology and distribution are very poorly known. It could prove to be just an epiphytic form of Lepra mammosa. The indicator values reflect the situation observed in Sardegna. It is included in the Italian red list of epiphytic lichens as “Data Deficient” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
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: absent
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

Erichsen C.F.E. 1936. Pertusariaceae. - In: Dr. L. Rabenhorsts Kryptogamenflora von Deutschland, Österreich und der Schweiz. Bd. IX, Abt. 5, T. 1. Akad. Verlagsges., Leipzig, pp. 321-512, 513-728. - Public Domain