Isolations were made from blighted pigeon-pea (Cajanus cajan) plants from different locations in India. A species of Phytophthora was consistently obtained from these locations and was proved to be the causal organism involved in the disease. Based on the sporangium shape and size, oogonium and oospore formation, temperature requirements, and pathogenicity tests, we have classified these isolates as P. drechsleri f. sp. cajani. The use of formae speciales was considered appropriate because of the specificity of these isolates to pigeon pea and Atylosia spp., wild relatives of the pigeon pea.
Mycologia, the official journal of the Mycological Society of America, publishes papers on all aspects of the fungi, including lichens. Subjects appropriate to the journal are fungal physiology and biochemistry, ecology, pathology, development and morphology, systematics, cell biology and ultrastructure, genetics, molecular biology, evolution, applied aspects, and new techniques. Mycologia has been published as a bimonthly journal continuously since 1909 as a continuation of the Journal of Mycology, which was founded in 1885, and has been the official publication of the Mycological Society of America since the formation of the society in 1932.
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