Platythecium maximum (Groenh.) Z.F. Jia & Luecking

Jia, Ze-Feng & Luecking, Robert, 2017, Resolving the genus Phaeographina Muell. Arg. in China, MycoKeys 21, pp. 13-32 : 26

Platythecium maximum (Groenh.) Z.F. Jia & Luecking comb. nov.

Phaeographina maxima Bas.: Groenh., in Blumea, Suppl. 5 (H. J. Lam Jubilee Vol.). 107, 1958. Type: Indonesia, Sumatra, Groenhart 9453 (BO, holotype, not seen, but original image in protologue seen).

Description.

Thallus saxicolous, crustose, surface grey, smooth; apothecia lirelline, elongate, subimmersed, single and branched, 1-20 mm long and 0.2-0.3 mm wide, with lateral thalline margin; labia conspicuous; discs open, dark; proper exciple completely carbonized; hymenium clear; 8 ascospores per ascus, brown, ellipsoid, muriform, 4/1-2-locular, 14-16 × 8-9 µm, I–.

Chemistry.

Not tested.

Notes.

This species is similar to Platythecium serpentinellum (Nyl.) Staiger in the brown ascospores and to P. allosporellum (Nyl.) Staiger in the carbonized hypothecium. The type material is different from any known species in the genus, it is here recombined as a separate species.