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SUMMARY
This study involves the developmental cycle of the imperfect fungus Cercospora sordida, long known to infect the foliage of Tecoma radicans. As structures, not previously known, this fungus has been found to produce, on fallen leaves, during late summer and autumn, spermogonia and carpogonia, the initials of the perithecial or ascogenous stage. By the following spring the ascogenous stage will have matured within the tissues of decaying leaves.
The peritheciaL stage is herein briefly described as Mycosphaerella Tecomae, and evidence of genetic connection with Cercospora sordid a is presented. Evidence of connection is as follows: (1) Cultures isolated from conidia are identical in appearance with those isolated from ascospores; (2) Cercospora conidia are formed in young cultures, both those isolated from conidia and those isolated from ascospores; (3) Cercospora conidiophores and conidia are abundantly produced from the ostiolar region of the perithecia of M. Tecomae.