ITALIC 8.0

Placidium fingens (Breuss) Breuss

Ann. naturhist. Mus. Wien, Ser. B, Bot. Zool., 98, suppl.: 38, 1996. Basionym: Catapyrenium fingens Breuss - Stapfia, 23: 79, 1990

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Distribution:

Description: Thallus squamulose, pale to medium brown, the squamules up to 6 mm broad, rather thin (0.24-0.33 mm thick), lobate, scattered to contiguous, fully adpressed to the substrate, with slightly ascending margins, at least the young ones with very thin hairs at the margins (microscope!). Lower surface whitish to pale brown, attached by pale, 6-8 μm thick rhizohyphae. Upper cortex paraplectenchymatous, 35-75 μm thick, with a thin epinecral layer; medulla white, of more or less globose cells intermixed with elongated cells; lower cortex not well-differentiated from the medulla, the cells not arranged in vertical rows, the lowermost ones often brown-walled. Perithecia frequent, laminal, broadly pyriform, immersed in the squamules, up to 0.5 mm across. Exciple colourless throughout; paraphyses absent, substituted by periphyses measuring 30-35 x 2-3 μm. Asci 8-spored, cylindrical, thin-walled, non-amyloid and without an ocular chamber, 70-80 x 11-15 μm. Ascospores 1-celled, hyaline, ellipsoid, thin-walled, uniseriately arranged in the asci, (12-)15-17(-18) x (5-)5-7 μm. Pycnidia multilocular, Dermatocarpon-type, laminal, immersed. Conidia cylindrical to bacilliform, (4-)5-6 x 1-1.5 μm. Photobiont chlorococcoid (Myrmecia). Spot tests: cortex and medulla K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a species described from Macaronesia and also known from the Iberian Peninsula, where it is generally rare; it grows on calcareous soil and fissures of calciferous rocks, from the montane to the alpine belts; to be looked for in Italy.

Growth form: Crustose

Substrata: rocks, soil, terricolous mosses, and plant debris

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

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Predictive model

Index Fungorum GBIF

Oregon State University Herbarium (OSC) Catalog #: OSC-M-051827 Leg. et Det. Bruce McCune Number: 36757a 20 May 2016 Additional Collectors: Daphne Stone, Andrea Ruchty Locality: United States, WASHINGTON, Klickitat, Edge of plateau on Margerum Ranch above Klickitat Latitude/Longitude: 45.8029 -121.1575, 540 m