Life cycle of a new species of Blumeriella (Ascomycotina: Dermateaceae), a leaf-spot pathogen of spirea

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Abstract
Cylindrosporium filipendulae Thuem. was isolated from diseased Spiraea .times. vanhouttei Zabel in Tennessee. On the basis of acervulus formation and conidial morphology. C. filipendulae is transferred to the genus Phloeosporella [P. filipandulae comb. nov.]. Apothecia observed on overwintered S. .times. vanhouttei leaves were determined by cultural methods to be the teleomorph of the Phloeosporella species. Conidia produced in culture by ascospore isolates infected spirea leaves and induced symptoms identical with those caused by the Phloeosporella species. Morphology and development of the teleomorph were compared with those of Blumeriella jaapii (Rehm) v. Arx (=Coccomyces hiemalis Hig.) and found to be quite similar. The new teleomorph is described as a species of Blumeriella [B. haddenii sp.nov.].