Graphis epimelaena Müller Arg. (1895: 319)

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 epimelaena Müller Arg. (1895: 319) .

Type:— AUSTRALIA. Queensland, corticola, 1894, Bailey 778 ( G!) .

Fig. 5A .

Thallus corticolous, off-white to whitish gray, continuous, smooth, dull. Lirellae immersed to erumpent with thick lateral thalline margin, short to elongate, straight or curved, unbranched, 2–3-furcate or irregularly branched, labia convergent, slightly divergent with age, entire, black, not pruinose, disc concealed or slightly open, white pruinose ( scripta -morph). Exciple apically carbonized; hymenium clear; ascospores 8/ascus, hyaline, transversely 9–10-septate, 38–50 × 7–9 μm, 9–11-septate, 40–60 × 10–12 μm (holotype, Lücking et al. 2009 and protologue).

Chemistry: no lichen substances by TLC (anal. J. Sutjaritturakan).

Distribution and habitat:—This is a very rare species which is known only from the type collection from Australia. It is growing on the bark in a plantation of scholar trees ( Alstonia scholaris ) in South-Thailand at 20 m. G. epimelaena is a new addition to the Thai lichen biota.

Remarks:—Very similar is G. glaucescens Fée (see below), but this species has an ecorticate thallus and permanently convergent labia, i. e. the disc is never visible from above.

Material from Thailand examined:— Chumphon province: Tha Sae district, tambon Tha Sae , in a plantation of Alstonia scholaris , 20 m, 10°39’08’’ N, 99°10’04’’ E, 7 June 2008, J. Sutjaritturakan 749 (hb. K. Kalb 42472) .

Figures

FIGURE 5. A. Graphis epimelaena (scale = 0.4); B. Graphis erythrocardia (scale = 0.5); C. Graphis flavovirens (scale = 1 mm); D. Graphis gonimica (scale = 0.25 mm); E. Graphis immersicans (scale = 0.5 mm); F. Graphis implicata (scale = 0.5 mm); G. Graphis insulana (scale = 0.7 mm); H. Graphis intricata (scale = 1 mm).