Abstract
AbstractFive new species of the genusPolymeridiumare described from Brazil. All exhibit at least one character that was previously unknown in the genus:P. corticatumhas a corticate thallus and 2 ascospores per ascus,P. immersumhas the ascomata deeply immersed in the bark under the thallus,P. isohypocrellinumhas a red, KOH+ green pigment (iso-hypocrellin) in the ostiole,P. julelloideshas short and broad muriform (Julella-like) ascospores, andP. paraproponenshas 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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