SUMMARY
The family Microascaceae is discussed in light of past and present research. New concepts of the family are put forward which encompass the results of this research and two new species, Microascus giganteus and Petriella musispora are described. Lophotrichus, Kernia and a new genus, Petriellidium, based on Allescheria boydii Shear are included in the Microascaceae for the first time. Characters of possible future taxonomic interest are also discussed.