Graphis subregularis A. W. Archer (2001: 266)

Kalb, Jutarat, Lücking, Robert & Kalb, Klaus, 2018, The lichen genera Allographa and Graphis (Ascomycota: Ostropales, Graphidaceae) in Thailand-eleven new species, forty-seven new records and a key to all one hundred and fifteen species so far recorded for the country, Phytotaxa 377 (1), pp. 448-450 : 448-450

Graphis subregularis A. W. Archer (2001: 266) .

Type:— AUSTRALIA. Queensland: Helensvale–Rossville road, 29 km S of Cooktown , 150 m, 15°45’ S, 145°15’ E, on Alphitonia , 5 July 1984, J. A . Elix 17392 ( CANB!, holotype) .

Thallus corticolous, off-white, continuous, smooth, corticate, dull. Lirellae erumpent, with a basal thalline margin, very short, up to 1 mm long, straight or curved, simple, labia convergent, striate, black, not pruinose, disc concealed, ( subregularis -morph). Exciple laterally carbonized; hymenium inspersed (type A); ascospores 8/ascus, hyaline, transversely 11–13-septate, 50–60 × 8–9 μm.

Chemistry: no lichen substances by TLC.

Distribution and habitat:—Probably palaeotropical, reported from Australia (type locality) and for the first time from Thailand, Loei province by Poengsungnoen et al. (2010), where it was collected in a lower montane rainforest and in dry dipterocarp forests. It was not present in our collections.

Remarks:—On a world basis, only one other Graphis species is known to have such small lirellae together with medium-sized ascospores, viz. G. regularis . But this species is easily distinguished in having a completely carbonized exciple and a clear hymenium.