1. Aptroot A (1991) A monograph of the Pyrenulaceae (excluding Anthracothecium and Pyrenula) and the Requienellaceae, with notes on the Pleomassariaceae, the Trypetheliaceae and Mycomicrothelia (lichenized and non-lichenized ascomycetes). Bibl Lichenol 44: 1–178
2. Aptroot A (1995) A monograph of Didymosphaeria. Stud Mycol Baarn 37: 1–160
3. Barr ME (1976) Perspectives in the Ascomycotina. Mem NY Bot Gard 28: 1–8
4. Barr ME (1979) A classification of Loculoascomycetes. Mycologia 71: 935–957
5. Barr ME (1983) The ascomycete connection. Mycologia 75: 1–13