A STUDY OF THE SPECIES OF ENTYLOMA ON NORTH AMERICAN COMPOSITES

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Abstract
A study of the species of Entyloma on North American composites suggests that almost every form can be assigned to one of two phyletic groups. E. polysporum contains most of the forms with densely crowded, rather large teliospores and no conidia. E. Davisii on Rudbeckia hirta and, probably, a fungus on Lepachys columnaris are segregated from it. E. Compositarum contains most of the forms with smaller, uncrowded spores and abundant conidia. E. arnicale and possibly one or two other forms may be regarded as segregates from this species.Emended descriptions of E. polysporum and E. Compositarum are given to clarify the differences between these two species. Corrections are also made in the identification of some exsiccati specimens.Comparisons are made with European forms to the extent that material has been available, but far more study of European specimens is needed to allow assessment of some species.Species concepts for these fungi are discussed, and criteria are suggested for adequate morphological studies.

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