The Testudinaceae, a new family of the Pseudosphaeriales, is characterized by astomatous ascomata with a dark peridium which is often made up of plates, by bitunicate asci, and by dark, 2-celled ascospores, about 10 µ long. Keyed out are the genera Testudina, Neotestudina, Lepidosphaeria, Argynna and Pseudophaeotrichum