. Bulletin of the British Museum (Natural History) Botany. . Fig. 15 Species of Myriotrema. (a) M. terebratulum (Hale 50 222). (b) M. thwaitesii (Hale 50 221). (c) M. wightii (Wheeler 12 465 in US). See Fig. 7i for scale. Observations. The dull appearance of the thallus surface can be correlated with the poorly organized cortex. This trait, together with the P+ unknown, sets the species apart from others in the M. album complex. The substance reacts H2S04+ dull orange and falls a little below the 'praestans' unknown from Dominica (see Hale, 1974a: 12). It may be related to thamnolic acid. 37.
. Bulletin of the British Museum (Natural History) Botany. . Fig. 15 Species of Myriotrema. (a) M. terebratulum (Hale 50 222). (b) M. thwaitesii (Hale 50 221). (c) M. wightii (Wheeler 12 465 in US). See Fig. 7i for scale. Observations. The dull appearance of the thallus surface can be correlated with the poorly organized cortex. This trait, together with the P+ unknown, sets the species apart from others in the M. album complex. The substance reacts H2S04+ dull orange and falls a little below the 'praestans' unknown from Dominica (see Hale, 1974a: 12). It may be related to thamnolic acid. 37. Myriotrema wightii (Taylor) Hale in Mycotaxon 11 : 135 (1980). (Fig. 15c) Endocarpon wightii Taylor in Lond. J. Bot. 6:155 (1847). Type: India, Madras, Wight (FH-Tayl.—lectotype; BM, G—isolectotypes). Thelotrema subconcretum Leighton in Trans. Linn. Soc. Lond. 27: 169 (1869). Type: Sri Lanka, Peradeniya, Thwaites C. L. 172 (BM—lectotype; G, NY, PC, PDA, S, UPS, W—isolectotypes). Leptotrema wightii (Taylor) Mull. Arg. in Flora, Jena 65 : 499 (1882). For additional synonymy see Sailsbury, 1971a : 5 and Hale, 1974a : 43 and 1978a : 55. Icones. Redinger, 1936 : 112 fig. 71—Salisbury, 1971a : 6 fig. 1.—Hale, 1978a : 55 fig. 15a (errone- ously given as fig. 15b). Thallus pale tannish mineral gray, 4-7 cm broad, thick and almost coriaceous, shiny, smooth and continuous, grainy; cortex lacking, a heavily pored polysaccharide sheet covering the underlying tissues; medulla dense and cellular, to 600 //m, organized in vertical blocks with algae in columns, with or without deep red crystalline masses, dense colourless crystals also present; apothecia immersed in the medulla, 02-03 mm diam, the exciple fused, often poorly developed; pore round, 0-05-0-1 mm diam, white rimmed; hymenium 180-200 //m; spores brown, muriform, 10-14 x 14-18 //m, 2 x4 loculate, uniseriate, I—. Chemistry. No substances present except for K+ purple pigment. Habitat. On Diospyros ebenum in shade at
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