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SUMMARY
This study deals with the morphology of the sooty blotch fungus of Trifolium, which has a conidial stage, a spermogonial stage, and a perithecial stage in its cycle of development.
The undulate character of the conidiophores is the result of sympodial branching. Each conidiophore produces a series of conidia. After each conidium is delimited the conidiophore elongates.
The spermogonia and perithecial fundaments are formed co- incidentally within the same stroma, sometimes in separate stromata, in autumn. Each is locular.
The spermogonial stage functions in the production of spermatia that apparently are essential to the subsequent development of the perithecia.
The perithecial stage matures in spring within locules of a dothidiaceous stroma.
The evidence in hand indicates that all parts of the fungus are pigmented with some tint or shade of brown.
Several names have been applied to each of the stages in the developmental cycle of the organism. It is herein regarded as the type of a new genus and is given the name Cymadothea Trifolii (Pers.).