ITALIC 7.0

Rostania effusa A. Košuth., M. Westb. & Wedin

Lichenologist, 54: 15, 2022

Synonyms:

Distribution:

Description: Thallus crustose, homoiomerous, gelatinous when wet, forming a thin, effuse crust of scattered to contiguous, 30-75(-100) μm wide granules resembling blastidia or goniocysts. Upper surface dark green to dark brown, dull, epruinose, semi-translucent when wet. Apothecia often scarce or absent, sessile, up to 0.3 mm across, globose and perithecia-like when young, with an initially punctiform, later flat, red-brown disc, and a thin, persistent thalline margin. Thalline exciple up to 75 µm wide, with a simple pseudocortex; proper exciple euthyplectenchymatous, with small-ellipsoid to rectangular cells, c. 10 µm wide; epithecium brown; hymenium colourless, 85-125 µm high, I+ blue; paraphyses c. 1.5 µm thick at mid-level, the apical cells up to 3(-5) µm wide; hypothecium colourless, up to 20 µm high. Asci 8-spored, cylindrical-clavate, the apex strongly thickened, the apical dome K/I+ pale blue, with a downwardly projecting K/I+ deep blue tubular structure. Ascospores subglobose when young, then more or less cubic with rounded angles and truncate ends, muriform with up to 12 cells in optical view, (8.7-)10-15(-16.3) x (8-)10-12.5(-14.5) µm. Pycnidia unknown. Photobiont cyanobacterial (Nostoc, the cells single or in clusters of 2-4). Spot tests: all negative. Chemistry: without lichen substances.

Note: a recently-described species of nutrient-rich or -enriched bark, widespread in Scandinavia and also known from Slovenia; to be looked for in Italy.

Growth form: Crustose

Substrata: bark

Photobiont: cyanobacteria, filamentous (e.g. Nostoc, Scytonema)

Reproductive strategy: mainly asexual, by isidia, or isidia-like structures (e.g. schizidia)

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

Index Fungorum GBIF