Crypthonia, a new genus of byssoid Arthoniaceae (lichenised Ascomycota)

• Crypthonia with 11 species is described as belonging to the Arthoniaceae. The new genus is characterised by (1) white to pale carneous, maculiform ascomata lacking a distinct exciple, (2) a weakly gelatinised, hydrophobic hymenium of paraphysoids, (3) a discontinuous layer of branched ascogenous hyphae in the hypothecium, (4) small, clavate to broadly clavate asci of the Arthonia-type lacking a hemiamyloid ring structure in the tholus, (5) eight small, hyaline, 1-3-septate, thin-walled ascospores per ascus, (6) loosely attached thalli with a byssoid, coloured hypothallus, and (7) a chemistry of mainly beta-orcinol depsidones and tridepsides including psoromic, norstictic, and gyrophoric acids. Rugulosin occurs in C. bella and C. citrina. Crypthonia athertoniensis Frisch & G. Thor, C. bella Frisch & G. Thor, C. brevispora Frisch & G. Thor, C. citrina Frisch & G. Thor, C. olivacea Frisch & G. Thor, C. palaeotropica Frisch & G. Thor, and C. vandenboomii Frisch & G. Thor are described. C. albida (F,e) Frisch & G. Thor, C. biseptata (Aptroot & Wolseley) Frisch & G. Thor, C. mycelioides (Vain.) Frisch & G. Thor, and C. polillensis (Vain.) Frisch & G. Thor are new combinations. The delimitation from similar genera and the position within the Arthoniaceae is discussed.

Subject headings

NATURVETENSKAP  -- Biologi -- Mikrobiologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Microbiology (hsv//eng)

NATURVETENSKAP  -- Biologi -- Ekologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences -- Ecology (hsv//eng)

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art (subject category)