Allographa schummii J. Kalb, Lücking & Kalb, 2018

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

** Allographa schummii J. Kalb, Lücking & Kalb , sp. nov. Fig. 2G .

Mycobank MB 827639

Allographa with apically carbonized exciple, large-sized muriform ascospores an opened disc with a cinnabar red K+ lemon yellow to golden yellow pruina.

Type:— THAILAND. Chiang Mai province: Fang district, tambon Mae Nyon , campsite area of Doi Angkhan , on bark of a ± freestanding deciduous tree, 1565 m, 19°53’42’’ N, 99°02’44’’ E, 3 December 2016, J. & K. Kalb 41897, ( RAMK, holotype) .

Etymology:—The new species is named in honour of our generous good friend and colleague, Dr. Felix Schumm.

Thallus corticolous, lead-gray, up to 6 cm diam., up to 180 μm thick, continuous, corticate, prothallus indistinct, surface smooth to uneven due to clusters of crystals, mostly glossy. Thallus in section with distinct upper cortex, up to 15 μm high, with irregular algal layer up to 120 μm high, medulla filled with clusters of crystals. Lirellae erumpent to prominent laterally with thick, apically very thin thalline margin, labia still visible, elongate, up to 5 mm long and 0.5 mm wide, 0.3 mm high, straight, curved or sinuous, irregularly branched, labia divergent, entire or partly striate, dark gray, not pruinose, disc opened ( negrosina - or symplecta- morph) with cinnabar red pruina. Exciple apically carbonized, up to 50 μm wide,; hypothecium 20 μm high, ± hyaline; hymenium 175–200 μm high, clear, epihymenium with orange crystals, K+ lemon- to golden-yellow. Paraphyses usually unbranched, sometimes furcately branched near the tips; asci elongate claviform, ca. 150 × 30–40 μm. Ascospores 1–2/ascus, hyaline, densely muriform, 17–35 × 1–8- septate, 80–140 × 20–35 μm, not halonate, I+ blue.

Chemistry: stictic acid (major), cryptostictic acid (minor), α- acetylconstictic acid (minor), hypostictic acid (minor), uncharacterized anthraquinone pigment.

Distribution and habitat:—This new species is so far only known from the type locality in northern Thailand where it is growing on smooth on bark of an unidentified deciduous tree in a moist habitat at 1565 m.

Remarks:—This new species is uniquely characterized by the pigmented epihymenium, visible as cinnabar-red pruina from above on the slightly exposed disc. It agrees in gross morphology with Allographa semirigida (Müll. Arg.) Lücking & Kalb , but the latter produces norstictic acid and a closed disc without pigment.

Figures

FIGURE 2. A. Allographa aquilonia (scale = 1 mm); B. Allographa atrocelatoides (scale = 1 mm); C. Allographa daintreensis (scale = 0.5 mm); D. Allographa elongata (scale = 0.5 mm); E. Allographa kansriana; inlet showing end of a terminally muriform ascospore with a gelatinuous cap (scale = 0.3 mm; scale inlet = 3 μm); F. Allographa macella (scale = 0.5 mm); G. Allographa schummii (scale = 0.5 mm); H. Allographa sitianoides (scale = 0.4 mm).