ITALIC 8.0

Porpidia nadvornikiana (Vězda) Hertel

Beih. Nova Hedwigia, 79: 437, 1984. Basionym: Haplocarpon nadvornikianum Vězda - Preslia, 44, 3: 209, 1972

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Distribution:

Description: Thallus crustose, episubstratic, poorly delimited, 0.2-0.5 mm thick, whitish grey to ash grey, continuous to rimose, more rarely rimose-areolate, with initially papillate, later digitiform, 0.1-0.5 mm thick and 1-2 mm high, simple to rarely dichotomously branched isidia with an arachnoid medulla, leaving circular scars when they fall off. Algal layer thick; medulla very lax. Apothecia not always present, lecideine, black-brown, circular in outline, 0.8-1.5(-2) mm across, adnate, with an initially flat, then strongly convex, grey-pruinose disc and a persistent to finally excluded, epruinose proper margin. Proper exciple well-developed, brown-black; epithecium dark brown to greenish brown; hymenium colourless, 95-110 µm high; paraphyses strongly coherent, branched and anastomosing, c. 1.5 µm thick, the apical cells slightly swollen; hypothecium black. Asci 8-spored, elongate-clavate, with a thin, outer amyloid layer and a thickened tholus penetrated by a pore, the sides of which stain I/KI+ deep blue, Porpidia-type. Ascospores 1-celled, hyaline, ellipsoid to ovoid, (17-)18-20(-22) x (6-)8-9(-10) µm, halonate when young. Photobiont chlorococcoid. Spot tests: medulla K+ yellow, C-, KC-, P+ orange. Chemistry: stictic acid syndrome.

Note: a very rare species of ultramafic rocks, growing in humid situations such as along mountain creeks. Known from a few stations from the Carpathians to the mountains of Atlantic Spain; never found in the Alps, where however its presence cannot be excluded where suitable substrata are present. To be looked for in Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

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

Most common in areas with a humid-warm climate (e.g. most of Tyrrenian Italy)

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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