Aspicilia inornata Arnold

Verh. zool.-bot. Ges. Wien, 27: 550, 1877.
Distribution: N - Ven, TAA, VA (Piervittori & Isocrono 1999). C - Tosc (TSB 10470), Sar.
Description: Thallus crustose, episubstratic, rimose-areolate, <0.5 mm thick, smooth, white, forming large patches, with or (usually) without a dark prothallus. Cortex paraplectenchymatous, indistinctly delimited, 35-50 µm thick formed by 3–5 µm wide polygonal cells, rich in large crystals insoluble in N and small crystals soluble in N; medulla white, filled by crystals resembling those of the cortex, I-; algal layer not extending below the hypothecium. Apothecia lecanorine-aspicilioid, immersed in the areoles, 1-3 per areole, 0.2-0.6 mm across, usually irregular in outline, with a concave to flat, black disc, and a thick but not prominent, dark thalline margin. Epithecium greenish to olive-brownish, N+ emerald green; hymenium colourless, (120-)130-140(-150) µm high, I+ yellowish brown; paraphyses coherent, submoniliform in upper part, the apical cells to 3 µm wide; hypothecium colourless, 40-50 µm high, I+ blue. Asci (6-)8-spored, clavate, the thin outer coat K/I+ blue, the wall and apical dome K/I-. Ascospores 1-celled, hyaline, ellipsoid, 18-24(-27) x (8-)10-12(-15) µm. Pycnidia immersed, with a black to brown, punctiform ostiole and a pale wall. Conidia bacilliform, straight 6-7 x 0.8-1 µm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: on periodically submerged schistose rocks along brooks in upland areas; most frequent in the Alps. According to Roux & coll. (2014) records from lowland areas are due to confusion with other species.
Growth form: Crustose
Substrata: rocks
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly sexual
Periodically submerged (e.g. in creeks)

Commonnes-rarity: (info)

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

pH of the substrata:


Solar irradiation:








Altitudinal distribution:


Predictive model
Herbarium samples

Michel Bertrand - Source: M. Bertrand & al. (2023). Lichens nouveaux ou intéressants pour la flore française. Bull. Assoc. Fr. Lichénologie, 2023, 48(1)
Massif de la Vanoise, étage subalpin.
Barre d’échelle : 10 mm.