Pocsia dispersa
Description : Thallus crustose, dispersed, orbicular, inconspicuous (×10 lens), to 0.3 mm diam., grey or white, pellucid, smooth, ecorticate. Photobiont Trentepohlia, cells 4–10 μm diam. Perithecia subglobose, solitary in centre of thallus, 0.15–0.20 mm diam., upper half pale red-brown, lower part grey-white, ostiole punctiform; wall 6–8(–10) μm thick, simple, pale- to dark-brown, paraplectenchymatous, K+ reddish brown, covered near the base with a thin layer of thalline tissue (containing photobiont cells). Paraphyses absent. Periphyses well-developed, persistent, short, to 20 μm long and 1.5 μm thick. Asci cylindrical-clavate to obpyriform, 6–8-spored. Ascospores cylindrical, slightly curved, apices rounded, 7-septate, 25–32 × 4–4.5 μm.
Chemistry : TLC−, all reactions negative.
S: Nelson. On leaves of forest trees, very inconspicuous and easily overlooked. Known also from West Africa and Zaire (Vězda 1982b: 390).
Pantropical
Illustrations : Vězda (1982b: 389, fig. 2); Malcolm & Malcolm (2001: 37, 52).
Pocsia dispersa is characterised by: the foliicolous habit; the minute, inconspicuous, dispersed, orbicular, grey-white thallus to 0.3 mm diam. (×10 lens); central, subglobose, red-brown perithecia, invested near base with a thalline covering; persistent periphyses; an absence of paraphyses; and transversely 7-septate, slightly curved ascospores with rounded apices, 25–32 × 4–4.5 μm.
