Platygramme elaeoplaca (Zahlbr.) Z.F. Jia & Luecking

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

Platygramme elaeoplaca (Zahlbr.) Z.F. Jia & Luecking comb. nov.

Phaeographina elaeoplaca Bas.: Zahlbr., Ann. Mycol. 30: 431, 1932. Type: Fujian: Chung 596 d (W, lectotype!, fide Nakanish on annotation label 1973).

Description.

Thallus corticolous, crustose, surface yellowish-grey, somewhat greenish, waxy, flat to slightly rough; apothecia lirelliform, sessile, black, elongate, single, not branched, 1-5 mm long and 0.2-0.4 mm wide; labia entire, exposed; discs closed, or slightly opened; proper exciple apically carbonized, thick; hymenium inspersed; 1 ascospore per ascus, brown, elongate-ellipsoid, densely muriform, 80-110 × 20-30 µm, I+ red-brown.

Chemistry.

No lichen compounds detected.

Notes.

This species is similar to Platygramme commutabilis , but the latter differs in having ascomata covered with a whitish thallus layer. Platygramme platyloma has a distinct, lateral thalline margin covering the ascomata, as well as larger ascospores (see above).