Abstract
This paper is a continuation of a study of Polyporus palustris Berk. & Curt. and two similar species associated with brown rot of southern conifers and hardwoods. Monospore cultures from fruit bodies developed in cultures, which were isolated from rots and designated as Polyporus sp. (10) and as Polyporus A (6), failed to pair with P. palustris or Polyporus spraguei Berk. & Curt. but were interfertile among themselves, indicating the presence of a third species. The identification of this undetermined species was made possible after monospore cultures were obtained from isolate No. FP 105065-Sp, which fruited in culture. This culture was isolated from a well-developed basidiocarp growing on a pecan (Carya sp.) stump in Mississippi. The basidiocarp was determined as Polyporus meliae Underw. by Dr. J. L. Lowe. Single-spore cultures from this isolate and those of all cultures listed in TABLE I were interfertile when paired in all possible combinations using methods described in earlier publications (9, 10). This complete compatibility indicates that all isolates belong to a single species, P. meliae.
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