New species of Polymeridium from Brazil expand the range of known morphological variation within the genus
2013
Aptroot, André | MENEZES, Aline Anjos | de LIMA, Edvaneide Leandro | XAVIER-LEITE, Amanda Barreto | CÁCERES, Marcela Eugenia da Silva
Five new species of the genus Polymeridium are described from Brazil. All exhibit at least one character that was previously unknown in the genus: P. corticatum has a corticate thallus and 2 ascospores per ascus, P. immersum has the ascomata deeply immersed in the bark under the thallus, P. isohypocrellinum has a red, KOH+ green pigment (iso-hypocrellin) in the ostiole, P. julelloides has short and broad muriform (Julella-like) ascospores, and P. paraproponens has ascomata in groups of two to three. Brazil is clearly the centre of diversity of the genus. Iso-hypocrellin is a new substance for the genus.
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