The carbonization of the GSK1904529A supplier excipulum occurs rather late in the apothecial ontogeny, Currently there are three species assigned to this genus (Fig. 4): Cruentotrema cruentatum (Mont.) Rivas Plata, Lumbsch and Lücking, comb. nov. Mycobank 563429. Bas.: Stictis cruentata Mont., Annales des Sciences Naturelles, Botanique, Sér. 4(3): 96 (1855). Syn.: Ocellularia cruentata (Mont.) Hafellner and Magnes, Bibliotheca Mycologica 165: 119 (1997). Tax. syn.: Arthothelium puniceum Müll. Arg., Hedwigia 32: 133 (1893). Tax. syn.: Thelotrema rhododiscum Homchantara and Coppins, Lichenologist 34: 135 (2002).
Cruentotrema kurandense (Mangold) Rivas Plata, Lumbsch and Lücking, comb. nov. Mycobank 563430. Bas.: Ocellularia kurandensis Mangold, Flora of Australia 57: 321 (2009). Cruentotrema thailandicum Rivas Plata, Papong and Lumbsch, spec. nov. Mycobank MCC950 solubility dmso 563431. Sicut Cruentotrema cruentatum sed ascosporis 3-septatis minoribusque differt. Type: Thailand. Chiang Mai Province: Doi Inthanon National Park, on roadside; 18° 55′ N, 98° 54′ E, 1185 m; mixed forest, on bark; January 2009, Lumbsch 19955d (MSUT, holotype; F, RAMK, isotypes). Thallus grey-olive, smooth to uneven, with dense, prosoplectenchymatous Selleck EPZ5676 cortex; photobiont layer with scattered clusters of calcium oxalate crystals. Apothecia erumpent,
angular-rounded, 0.6–1.5 mm diam.; disc thickly white-pruinose but usually hidden by a partially splitting thallus layer that exposes a deep red-pigmented medulla (easily mistaken for representing the disc); margin formed by the outer portions of the thallus layer, lobulate to recurved, grey-olive, inner parts red-pruinose. Excipulum prosoplectenchymatous, dark brown or upper half carbonized. Periphysoids absent. Columella absent. Hymenium 70–90 μm high; paraphyses unbranched. Ascospores 8/ascus, 3-septate, crotamiton 15–25 × 7–10 μm, ellipsoid, with thick septa and diamond-shaped lumina (Trypethelium-type), colorless, I– (non-amyloid).
Secondary chemistry: medulla of apothecial margin with dark red, K + yellow green pigment (isohypocrelline). The new species agrees with Cruentotrema cruentatum in all features except for the 3-septate, slightly smaller ascospores. The distinction of the two taxa is supported by molecular data (Rivas Plata and Lumbsch 2011a). Key to the species of Cruentotrema 1a. Medulla in apothecial margin grey-brown with white pruina, K–; ascospores submuriform ……………………………………………………………………………… C. kurandense 1b. Medulla in apothecial margin dark red, K + green ……………………………………………………………………….. 2 2a. Ascospores 3-septate, 15–25 × 7–10 μm ………………………………………………………………………. C. thailandicum 2b. Ascospores submuriform, 20–30 × 8–12 μm ………………………………………………………………….. C.
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