Attention is drawn to the fact that the development of ascostromatic fungi is so diverse that it is possible to recognize a number of differently organized groups. Some of these groups correspond to the developmental types recognized by Luttrell but it is also shown that his Pleospora-type is not homogeneous, comprising as it does a number of categories, each of which has its own type of development of the ascocarp. To designate structures not indicated before, the new terms tichus, cataphysis, and tinophysis are introduced.