Pyrenula albonigra Aptroot, D.S. Andrade & M. Cáceres, 2015

Aptroot, André, Andrade, Dannyelly Santos, Mendonça, Cléverton, Lima, Edvaneide Leandro De & Cáceres, Marcela Eugenia Da Silva, 2015, Ten new species of corticolous pyrenocarpous lichens from NE Brazil, Phytotaxa 197 (3), pp. 197-206 : 201

Pyrenula albonigra Aptroot, D.S. Andrade & M. Cáceres , sp. nov. ( Fig. 2C–D )

Mycobank #811018

Pyrenula with pale grey corticate thallus which also covers the ascomata except for a wide black ostiole, ascospores 3-septate, 17–20 ×

7–9 μm.

Holotype: — BRAZIL. Sergipe: Capela, Refúgio de Vida Silvestre Mata do Junco ; 10˚32’S, 37˚03’W; alt. 150 m; on bark of tree; 11 February 2014, D.S. Andrade T2 A27 ( ISE; isotype: ABL).

Thallus thin, corticate, mineral grey, somewhat glossy, without pseudocyphellae, surrounded by an up to 1 mm wide black prothallus line. Ascomata superficial, hemispherical, 0.3–0.4 mm diam., single, covered by the thallus except for a wide black spot around the ostiole. Wall carbonized all around. Ostiole apical, black. Hamathecium not inspersed with oil droplets. Ascospores 8/ascus, brown, irregularly biseriate, 3-septate, 17–20 × 7–9 μm, lumina diamond-shaped, separated from the wall by a thick layer of endospore. Pycnidia not observed. Chemistry: Thallus UV –; no substances detected with TLC.

Ecology and distribution: —On smooth bark in undisturbed Atlantic rain forest. Only known from Brazil.

Discussion: —This species is characterized by the pale grey corticate thallus which also covers the ascomata except for a strongly contrasting wide black spot around the ostiole.

Figures

FIGURE. 2. Pyrenula abditicarpa (isotype ABL); A, habitus showing depressed ostioles; B, ascospores; C–D, P. albonigra (isotype ABL); C, habitus showing ascomata covered by thallus except for a wide black spot around the ostiole; D, ascospores. A & C: bar = 0.5 mm; B: bar = 20 μm; D: bar = 5 μm.