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Remarks (public):Subfamily Fissurinoideae is here established for a strongly supported clade being sister to the remaining Graphidaceae, here delimited as subfamilies Gomphilloideae and Graphidoideae respectively (Fig. 1; Rivas Plata and Lumbsch, 2011; Rivas Plata et al., 2011a-c). The subfamily spans the entire range of morphological and chemical variation found in Graphidoideae and is difficult to characterize phenotypically (Fig. 2-4). The three subfamilies are, however, genetically distinct, and one character restricted to subfamily Fissurinoideae are the trypethelioid ascospores with diamond-shaped lumina occurring in four of the five genera (Frisch et al., 2006; Rivas Plata and Lumbsch, 2011). Not all species of the subfamily exhibit that character, but this type of ascospores is typical of Clandestinotrema, Cruentotrema, Dyplolabia, and a number of species currently classified in Fissurina. 
Description type:Original description 
Description:Ascomata rounded to elongate, immersed to sessile. Excipulum hyaline to carbonized. Periphysoids sometimes present and sometimes with warty tips. Columella structures sometimes present. Hamathecium and asci non-amyloid. Ascospores transversely septate to muriform, colorless, non-amyloid to (weakly) amyloid in a few species, septa thin to thickened, lumina rectangular to lens-shaped or rounded or diamond-shaped (resembling ascospores of Trypetheliaceae). Secondary chemistry variable, mostly no substances or stictic or psoromic acid as major, rarely lecanoric acid or pigments in ascomata. 
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