1. Ahmadjian V (1993) The lichen symbiosis. Wiley, New York
2. Ahti T (1982) The morphological interpretation of cladoniform thalli in lichens. Lichenologist 14:105–113
3. Aptroot A (1991a) A monograph of the Pyrenulaceae (Excluding Anthracothecium and Pyrenula) and the Requienellaceae, with notes on the Pleomassariaceae, the Trypetheliaceae and Mycornierothelia (lichenised and non-lichenised ascomycetes). Bibl Lichenol 44:1–178
4. Systematics Association Spec Vol No 43;A Aptroot,1991
5. Aptroot A, Sipman HJM (1993a) Trichotheliaceae. Flora Guianas Ser E, 2:1–57