Pyrenula abditicarpa Aptroot & 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 : 199-200

Pyrenula abditicarpa Aptroot & M. Cáceres , sp. nov. ( Fig. 2A–B )

Mycobank #811017

Pyrenula with the ascomata 1–2 mm deep immersed in the bark underneath the thallus, ascospores distoseptate muriform, 7–9 × 3–7- septate, 50–55 × 23–25 μm.

Holotype: — BRAZIL. Sergipe: Areia Branca, Parque Nacional Serra de Itabaiana ; 10˚45’37”S, 37˚22’15”W; alt. c. 250 m; on bark of tree; 18 September 2013, M.E.S. Cáceres & A. Aptroot 18593 ( ISE; isotype: ABL).

Thallus thin, corticate, olive brown, smooth, closely following the rough bark, without pseudocyphellae, without prothallus. Ascomata 1–2 mm deep immersed in the bark underneath the thallus, pyriform, 0.6–0.8 mm diam., single. Wall carbonized all around. Ostiole apical, pale brown, depressed. Hamathecium not inspersed with oil droplets. Ascospores 8/ascus, irregularly biseriate, brown, distoseptate muriform, 7–9 × 3–7-septate, 50–55 × 23–25 μm, lumina mostly rounded. 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 deeply immersed ascomata and the mid-sized muriform ascospores. It would key out in couplet 48 in key A in the world key (Aptroot 2012: 16).

covered with the species; E, habitus showing aggregated ascomata; F, ascospore. C & E: bar = 0.5 mm; D: bar = 1 cm; B & F: bar = 10 μm.

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.