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Summary
The perfect stage of Diplodia gossypina proves to be a Physalospora closely related to P. malorum.
The perfect stage of this fungus, which is provisionally called Physalospora gossypina, is distinguished from P. malorum by having slightly larger perithecia and ascospores.
The pycnospores of the two fungi are easily distinguished by their size, color, and the relative number of septate spores.
Diplodia gossypina cannot be distinguished at present from Diplodia natalensis on morphological grounds, but D. natalensis is able to grow at higher temperatures than D. gossypina.
Botryosphaeria fuliginosa, as used by Ellis and Everhart, includes species belonging to both the genera Botryosphaeria and Physalospora as now understood. It was apparently never a valid name for any of these fungi. The name Botryosphaeria Ribis G. & D. is now applied to the Botryosphaeria on cotton.