Arthonia sampaianae (Diederich & Etayo) Ertz & Diederich

in Ertz & al., Bibl. Lichenol., 91: 123, 2005.. Basionym: Plectocarpon sampaianae Diederich & Etayo - Nordic J. Bot., 14, 5: 595, 1994.
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Description: Thallus inapparent, not lichenized, developing inside gall-like formations on the thalli of Nevesia sampaiana. Apothecia arthonioid, single or in groups of 2-5, rounded, 0.2–0.5 mm across, immersed in 0.5-1 mm wide galls, dark brown to black, flat, without a proper margin. Epithecium brown, K+ olive; hymenium brownish, 100-140 μm high, K+ olive, I+ red; paraphysoids branched and anastomosing, 2-4 μm thick, the apical cells pigmented, not markedly enlarged; hypothecium colourless. Asci 4-8-spored, clavate, semi-fissitunicate, with a large apical dome, and a distinct ocular chamber. Ascospores 3-septate, slightly constricted at septa, at first hyaline then turning brown, ellipsoid, 20-26 x 6-8 μm, with a 0.5-4 μm thick perispore which becomes dark brown at maturity. Photobiont absent. Spot tests: K-, C-, KC-, P-. Chemistry: without lichen substances.
Note: a lichenicolous fungus growing on the thalli of Nevesia sampaiana; known from several countries in Western Europe, to be looked for in Tyrrhenian Italy.
Growth form: Lichenicolous fungus
Substrata: bark
Reproductive strategy: mainly sexual
paras Nevesia sampaiana



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