Nine new lichen species and 64 new records from Sri Lanka Author Weerakoon, Gothamie Author Aptroot, André text Phytotaxa 2016 2016-10-19 280 2 152 162 http://dx.doi.org/10.11646/phytotaxa.280.2.5 journal article 10.11646/phytotaxa.280.2.5 1179-3163 13651969 Porina monilisidiata Weerakoon & Aptroot , sp. nov. ( Fig. 2C–D ) Mycobank No.: MB 817613 Porina with shiny, olive green thallus, isidia numerous, corticate, mostly simple, but some branched, wavy to moniliform, cylindrical, c. 0.005 mm diam. and c. 0.3–0.8 mm high; ascomata low conical, c. 0.7–1.2 mm diam., fully covered by a thin layer of thallus through whichs the dark ascoma appear grey-brown, with a black, 0.1–0.3 mm wide ostiole; ascospores consistently 9-septate, 65–75 × 10–13 μm. Type: — SRI LANKA . Sinharaja, on bark of tree, 17 February 2015 , G.Weerakoon & P.Wolseley Si73B ( holotype PD , isotype F). Thallus corticate, smooth or slightly rugulose, covering araes up to 10 cm diam., shiny, continuous, thin, olive green, surrounded by a thin black prothallus. Isidia numerous, corticate, concolorous with thallus, mostly simple, but some branched, wavy to a bit moniliform, cylindrical, c . 0.05 mm diam. and c . 0.3–0.8 mm high. Algae trentepohlioid. Ascomata low conical, c . 0.7–1.2 mm diam., fully covered by a thin layer of thallus through which the dark ascoma appear grey-brown, with a black, 0.1–0.3 mm wide ostiole. Ascospores consistently 9-septate, 65–75 × 10–13 μm. Pycnidia not observed. Chemistry. Thallus UV–, C–, K–, KC–, Pd–. TLC: No substances detected. Distribution and habitat: —On tree in wet lowland tropical rain forest. Only known from Sri Lanka . Discussion: —This species is characterized by the combination of 9-septate ascospores, low perithecium warts of a colour that is markedly different from the thallus, and coralloid isidia. Isidia occur in about a dozen other species of Porina , if the genus is taken in a wide sense. Harris (1995) and Cáceres et al. (2013) give a comparison of several tropical isidioid species. In most species isidia are regarded as a constant character by most authors, although McCarthy (1993) accepts one species, viz. P. tetracerae (Afz. in Ach). Müll. Arg. ( Müller 1885: 401 ), which has only “occasionally isidioid outgrowths”. Such material was previously described as Clathroporina isidiifera R.C. Harris (1995: 171) . The new species differs by much longer ascospores that are 9-septate, and by much longer isidia than any of the isidiate species described in Porina s.lat.