ITALIC 8.0

Verrucula microspora Nav.-Ros. & Cl. Roux

in Roux & Coll., Cat. Lich. et Champ. Lich. France Métr.: 1314, 2014

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Distribution:

Description: Thallus crustose, areolate, growing on the thalli of Variospora dalmatica. Areoles scattered or forming small clusters, (0.1-)0.2-0.4 mm wide, 0.06-0.15 mm thick, irregularly rounded in outline, mostly flat, brown to grey-brown, darker at margin, usually epruinose. Cortex 7-13 μm thick, of 1-2 layers of brown cells, with a 7-9 μm thick, colourless epinecral layer; medulla white, at least in part I+ pale blue-violet, the lower part with abundant large crystals. Perithecia black, 0.15-0.22 mm across, globose, at first immersed, then clearly projecting. Involucrellum absent; exciple paraplectenchymatous, colourless except around the ostiole, c. 15 μm thick at base; hymenium colourless, I+ reddish; hamathecium of periphyses along the ostiolar channel, pseudoparaphyses in upper part of the perithecium, and paraphyses disappearing early; pseudoparaphyses 15-25 x 2-2.5 μm. Asci 8-spored, clavate, bitunicate, with a thin tholus reacting I-, Verrucaria-type. Ascospores 1-celled, hyaline, broadly ellipsoid, (8-)9-10.5(-11) x (5-)5.5–6(-6.5) μm. Photobiont chlorococcoid. Spot tests: K-, C-, KC-, P-, UV-. Chemistry: without lichen substances.

Note: a rare lichenicolous lichen on Variospora dalmatica on calcareous rocks; widespread in SW Europe, with a few records from the Western Alps (France); to be looked for in Italy.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

paras Variospora dalmatica

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Predictive model

Index Fungorum GBIF

Zschacke, H. (1934) Epigloeaceae, Verrucariaceae und Dermatocarpaceae. In: Dr. L. Rabenhorst‘s Kryptogamen-Flora, Band 9, Abt. 1, Teil 1. Akademische Verlagsgesellschaft, Leipzig, 695 pp. - Public Domain