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Brown Leaf Necrosis of Mahonia bealei Caused by Cylindrocladium ellipticum species nova. S. A. Alfieri, Jr., Plant Pathologist, Division of Plant Industry, Florida Department of Agriculture and Consumer Services, Gainesville 32601; C. P. Seymour(2), and E. K. Sobers(3). (2)Chief Plant Pathologist, Division of Plant Industry, Florida, Department of Agriculture and Consumer Services, Gainesville 32601; (3)Associate Professor of Plant Pathology, University of Georgia College of Agriculture Experiment Stations, Coastal Plain Station, Tifton 31974. Phytopathology 60:1212-1215. Accepted for publication 16 March 1970. DOI: 10.1094/Phyto-60-1212.

Cylindrocladium ellipticum sp. nov. is designated as the cause of a leaf spot and marginal necrosis of leaves of Mahonia bealei at Monticello, Florida. Pathogenicity to leaves of Rhododendron indicum ‘Pride of Dorking’ has also been established. Although the fungus superficially resembles C. scoparium, its vesicles are significantly smaller, 9.5-20.4 × 6.8-8.8 µ (average 15.8 × 7.6 µ), than those of C. scoparium, 19.0-37.7 × 8.3-14.5 µ (average 29.6 × 11.9 µ), and its conidia are larger, 47.6-76.2 × 4.1-5.4 µ (average 62.7 × 4.6 µ), as compared with 34-57.1 × 3.5-4.8 µ (average 43.6 × 4.4 µ) for C. scoparium. Conidiophores of C. ellipticum are more numerously branched than those of C. scoparium, and its phialides are mostly reniform, whereas those of C. scoparium are mostly doliform. A detailed comparison of the two species is made.