Japewiella tavaresiana (H. Magn.) Printzen

in Hertel, Arnoldia, 18: 4, 2000. Basionym: Lecidea tavaresiana H. Magn. in Tavares - Brotéria, N. S., 16: 145, 1947.
Synonyms: Japewia carrollii (Coppins & P. James) Tønsberg; Japewiella carrollii (Coppins & P. James) Printzen; Lecidea carrollii Coppins & P. James
Distribution: N - Lig (Giordani & Incerti 2008). C - Tosc (Loppi & al. 1994, Loppi & Putortì 2001).
Description: Thallus crustose, thinly episubstratic, whitish to pale grey, delimited by a thin, black prothallus. Apothecia lecideine, 0.2-0.5 mm across, round, with a flat, red-brown, finally often blackish disc, and a rather thick, raised, persistent proper margin. Proper exciple well-developed, pale red-brown in outer part, colourless within, of radiating, gelatinized hyphae; epithecium pale red-brown, K+ dull brown, N-; hymenium colourless, 60-70 μm high; paraphyses branched and anastomosing in upper part, the apical cells slightly swollen, with a brown cap; hypothecium colourless, 20-45 μm high, I+ blue. Asci 8-spored, clavate, with a wide apical cushion, Lecidella-type. Ascospores 1-celled, hyaline, ellipsoid, 13-17(-19) x 8.5-10 μm, with a thick, non-layered wall. Photobiont chlorococcoid. Spot tests: thallus K- or K+ pale yellow, C-, KC-, P-. UV-. Chemistry: thallus with atranorin, usually in low quantities.
Note: on smooth or slightly rough bark of small deciduous trees, or on branches and twigs of larger trees, in moist woodlands, especially by streams and bogs below the montane belt. The species is included in the Italian red list of epiphytic lichens as “Critically Endangered” (Nascimbene & al. 2013c).
Growth form: Crustose
Substrata: bark
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual

Commonnes-rarity: (info)

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

pH of the substrata:

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Altitudinal distribution:

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Predictive model
Herbarium samples

Source: http://fungi.myspecies.info/gallery/tavaresiana - Licence: CC BY-NC 3. Photo uploaded by Paul Cannon