title: A new species of Pseudorobillarda, an endophyte from Thuja occidentalis in Canada, and a key to the species.
abstract: Pseudorobillarda monica sp. nov. is described and illustrated. The endophyte was isolated from living leaves and bark of twigs of a Thuja occidentalis bonsai (>90 years old) at the Montréal Botanical Garden and ornamental trees in Montréal urban plantations. This pycnidial fungus is typical of the genus in morphology but clearly differs from other species in Pseudorobillarda by the distinct size of the conidiomata and the shape and size of conidia and paraphyses. Its taxonomic placement is discussed and a key to the species of Pseudorobillarda is provided.
authors.affiliation: Institut de recherche en biologie végétale and Département de sciences biologiques, Université de Montréal and Jardin botanique de Montréal. 4101 est, rue Sherbrooke, Montréal, Québec, H1X 2B2 Canada.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Vujanovic
authors.forename: Marc
authors.initials: M
authors.lastname: St-Arnaud