Porina monilisidiata Weerakoon & Aptroot, 2016

Weerakoon, Gothamie & Aptroot, André, 2016, Nine new lichen species and 64 new records from Sri Lanka, Phytotaxa 280 (2), pp. 152-162 : 157

publication ID

https://doi.org/ 10.11646/phytotaxa.280.2.5

persistent identifier

https://treatment.plazi.org/id/03968782-FFF5-FF8E-FF7D-302216D1FB31

treatment provided by

Felipe

scientific name

Porina monilisidiata Weerakoon & Aptroot
status

sp. nov.

Porina monilisidiata Weerakoon & Aptroot View in CoL , sp. nov. ( Fig. 2C–D View FIGURE 2 )

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.

PD

Dutch Plant Protection Service, Culture Collection of Plant Pathogenic Bacteria

Kingdom

Fungi

Phylum

Ascomycota

Class

Lecanoromycetes

Order

Ostropales

Family

Porinaceae

Genus

Porina

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