Pyrenula inspersicollaris 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 : 203

Pyrenula inspersicollaris Aptroot & M. Cáceres , sp. nov. ( Fig. 4D–E )

Mycobank #811022

Pyrenula similar to P. septicollaris , but differing by the inspersed hamathecium, ascospores 3-septate, 17–20 × 5.5–6.5 μm.

Holotype: — BRAZIL. Sergipe: Areia Branca, Parque Nacional Serra de Itabaiana , S slope; 10˚44’35”S, 37˚20’25”W; alt. c. 400 m; on bark of tree; 10 May 2014, M.E.S. Cáceres & A. Aptroot 21754 ( ISE; isotype: ABL).

Thallus thin, corticate, dark brown, somewhat glossy, without pseudocyphellae, without prothallus. Ascomata emergent from the bark but fully covered by thallus, pyriform, 0.3–0.5 mm diam., usually 2–7 fused, without clearly fused walls but with fused ostioles. Wall carbonized all around. Ostiole lateral. Hamathecium inspersed with hyaline oil droplets. Ascospores 8/ascus, brown, irregularly biseriate, 3-septate, 17–20 × 5.5–6.5 μm, lumina mostly rounded, 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 close to the common pantropical species Pyrenula septicollaris (Eschw.) R.C. Harris (1989: 101) , which also grows in the same location, in most characters, but differs by the inspersed hamathecium.

Additional specimen examined: — BRAZIL. Sergipe: Parque Nacional Serra de Itabaiana, S slope ; 10˚44’35”S, 37˚20’25”W; alt. c. 400 m; on bark of tree; 10 May 2014, M.E.S. Cáceres & A. Aptroot 21788 ( ISE; ABL, topotypes) .

Figures

FIGURE. 4. Pyrenula celaticarpa (isotype ABL); A, habitus showing convex, dark red to almost black ostioles; B–C, ascospores; D–E, P. inspersicollaris (isotype ABL); D, ascospore; E, habitus showing a raised shared ostiole surrounded by immersed ascomata;. A, E: bar = 0.5 mm; B: bar = 10 μm; C–D: bar = 5 μm.