Arthonia rubescens (Arnold) Clauzade, Diederich & Cl. Roux

Bull. Soc. Linn. Provence, num. spéc. 1: 28, 1989.. Basionym: Conida rubescens Arnold - in Zopf, Hedwigia, 35, 6: 325, 1896.
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Description: Thallus inapparent, not lichenized, developing inside the thalli of Diplotomma hedinii . Apothecia arthonioid, immarginate, black, flat to slightly convex, single or more often clustered in groups of 1-12, more or less round, 0.1-0.3 mm across, at first immersed in the thallus of the host, then slightly raised. Proper exciple not developed; epithecium brown; hymenium pale brown, I+ dark red; paraphysoids branched and anastomosing, the apical cells brown-capped; hypothecium poorly delimited from the hymenium, colourless. Asci 8-spored, subglobose to ovoid, semi-fissitunicate, with a large apical dome, and a distinct ocular chamber, Arthonia-type. Ascospores 1-septate, not markedly constructed at septum, with unequal cells, hyaline, ovoid to pyriform, 16-21 x 9-11 µm. Photobiont absent. Spot tests: thallus K-, C-, KC-, P-. Chemistry: without lichen substances. Note: described from Austria (Tyrol), to be looked for in Italy.
Note: a lichenicolous fungus growing on the thalli of Diplotomma hedinii; described from Austria (Tyrol), to be looked for in Italy.
Growth form: Lichenicolous fungus
Substrata: rocks
Reproductive strategy: mainly sexual
paras Diplotomma hedinii



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Harrie Sipman – Source http://www.bgbm.fu-berlin.de/sipman/Zschackia/AegeanLichens/CaloplacaAC.htm - As Caloplaca oasis


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


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