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Abstract
A new species of rust fungus, Maravalia perae on Pera sp. (Euphorbiaceae), from Brazil is proposed. Spermogonia are type 5 and aeciospores and urediniospores are asymetrically obovoid to ellipsoid, with a concave side and 3(–4) equatorial germ pores. Teliospore walls are 2–5 μm thick at apex around the apical germ pore. This set of characters differentiates M. perae from other species of Maravalia. A revised key to all known Maravalia species, including the newly discribed species, is provided.
The authors thank FAPERJ, FAPESP and CNPq in Brazil and NSF in United States of America for financial support and the curator of Instituto Biologico de São Paulo Herbarium (IBI) for loans of examined specimens.