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Cylindrocladium heptaseptatum sp. nov. on Fronds of Polystichum adiantiforme from Honduras. E. K. Sobers, Associate Professor, Department of Plant Pathology, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton 31794; S. A. Alfieri, Jr.(2), and J. F. Knauss(3). (2)Assistant Director, Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Gainesville 32602; and (3)Assistant Plant Pathologist, University of Florida, Agricultural Research Center, Apopka 32703. Phytopathology 65:331-333. Accepted for publication 11 October 1974. DOI: 10.1094/Phyto-65-331.

Cylindrocladium heptaseptatum sp. nov. was isolated from fronds of Polystichum adiantiforme plants imported into central Florida from Honduras. Its morphology and pathogenicity were compared with that of C. pteridis and C. quinqueseptatum. The three species produced similar symptoms on leaves and stems of Annona squamosa, but lesions on fronds of P. adiantiforme differed in shape and color. The three species are readily distinguished by the length, width, and number of septations of their conidia, by the shape of their phialides, and by the number of conidiophore branches.