ITALIC 8.0

Heteroplacidium acervatum (Breuss) Breuss

Ann. naturhist. Mus. Wien, Ser. B, Bot. Zool. 98 (Suppl.): 40, 1996. Basionym: Catapyrenium acervatum Breuss - Linzer biol. Beitr., 28, 1: 525, 1996

Synonyms:

Distribution:

Description: Thallus squamulose, of scattered to contiguous squamules usually forming compact, cushion-like aggregates, the squamules 0.3-3 mm wide, 0.25-0.4 mm thick, irregularly rounded to slightly lobed, convex, pale to medium brown, matt, greyish towards the margins; lower surface brown, attached by colourless, 3-5 μm thick rhizohyphae which aggregate in the central parts of squamules into a stipe-like organ. Upper cortex 25-45 μm thick, paraplectenchymatous, with or without a thin epinecral layer; medulla white in upper part, brownish in lower part, of spherical hyphae; lower cortex not clearly delimited from the medulla. Perithecia black, subglobose, up to 0.35 mm wide, immersed in the squamules, without involucrellum. Exciple up to 30 μm thick, pale except near the ostiole; hamathecium of peripgyses, interascal filaments absent; hymenial gel hemiamyloid. Asci 8-spored, clavate, I-, fissitunicate, the wall thickened above, Verrucaria-type, 50- 60 x 11-15 µm. Ascospores 1-celled, hyaline, ellipsoid, 11-13 x 5-6 μm, biseriately arranged in the asci. Pycnidia laminal, black, immersed, of the Dermatocarpon-type. Conidia bacilliform, 4-7 x 1-1.5 μm. Photobiont chlorococcoid (Myrmecia). Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a Mediterranean species growing directly on calcareous rocks, known from the Iberian Peninsula and the Balearic Islands; to be looked for in Mediterranean Italy.

Growth form: Squamulose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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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