ITALIC 7.0

Placidiopsis cinereoides Breuss

Öst. Z. Pilzk., 5: 84, 1996.

Synonyms:

Distribution:

Description: Thallus squamulose, of contiguous to slightly overlapping squamules, forming a compact rosette. Squamules 0.5-2 mm wide, 0.2-0.4 mm thick, finely lobulate to crenate, flat to slightly convex, the peripheral ones often somewhat elongated and radially arranged; upper surface whitish to greenish grey-brown, epruinose; lower surface dark with brown rhizohyphae. Upper cortex up to 20 μm thick, of roundish-subangular cells, overlain or not by an epinecral layer; medulla subparaplectenchymatous, white but becoming brownish in lower part, where it merges with a thin paraplectenchymatous lower cortex of more densely aggregated cells. Rhizohyphae brown, c. 4 μm thick. Perithecia subglobose, 0.2–0.4 mm across, immersed in the squamules. Exciple colourless to brownish; paraphyses absent, but periphyses present around the ostiole. Asci 8-spored, narrowly clavate, thin-walled, apically slightly thickened, with a small ocular chamber, K/I-. Ascospores (0-)1 septate, sightly constricted at septum, hyaline, narrowly ellipsoid to fusiform, (20-)22–28(-30) x (6.5-)7–8(-8.5) μm, biseriately arranged in the asci. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: on siliceous rocks in rather shaded situations; described from Spain; to be looked for in Italy.

Growth form: Squamulose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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