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Six new species of the lichen genus Pyrenula (Pyrenulaceae) from Northeast Brazil

CLÉVERTON DE OLIVEIRA MENDONÇA, ANDRÉ APTROOT, MARCELA EUGENIA DA SILVA CÁCERES

Abstract


Six new Pyrenula species are described as new to science, viz. Pyrenula aurantiothallina C. O. Mendonça, Aptroot & M. Cáceres, with orange thallus with KOH+ purple anthraquinone, simple low conical ascomata, inspersed hamathecium, and ascospores 3-septate, 19.5–22.5 × 7–8.5 µm, generally somewhat constricted at the septa; Pyrenula coccinea C. O. Mendonça, Aptroot & M. Cáceres, with yellowish brown thallus and ascomata with 6 to 25 together immersed in a pseudostromata with partly fused outer walls but separate, apical ostioles, covered with red pruina, ascospores 3-septate, 15–18(–20) × 5–6 µm; Pyrenula diamantinensis C. O. Mendonça, Aptroot & M. Cáceres, with thallus yellowish brown, corticate, partly with a layer of whitish pruina, with (often eroded) pseudocyphellae, ascomata flattened to subglobose, numerous, partly covered by a layer of whitish pruina, 0.3–0.5 mm diam., mostly with 2–10 sideways touching but not totally fused, clypeus in upper half much thicker than below, ascospores 3-septate, 26–33 × 11–16 µm, lumina mostly obliquely quadrangular; Pyrenula lilacina C. O. Mendonça, Aptroot & M. Cáceres, with lilac thallus, simple ascomata, and ascospores 3-septate, 31–37 × 11–14 µm; Pyrenula supralaetior C.O. Mendonça, Aptroot & M. Cáceres, which is similar to P. laetior Müll. Arg., but with ascospores 25–31 × 11–13 µm; and Pyrenula violaceastroidea C. O. Mendonça, Aptroot & M. Cáceres, with ascomata pyriform, aggregated by 3–6 perithecia with a shared ostiole but without joint walls (parmentarioid), ostiole, ascomata and thallus partly covered by wine-red to purplish, KOH+ purple, anthraquinone. They were all found by the first author during several recent field trips in the North and Northeast of Brazil.


Keywords


Pyrenulaceae, Bahia, Chapada Diamantina, Neotropics, lichenized fungi, Lichens

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DOI: http://dx.doi.org/10.11646/phytotaxa.286.3.4

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ISSN 1179-3155 (print); ISSN 1179-3163 (online)

Published by Magnolia Press, Auckland, New Zealand