1. Heim, R. in Evolution in the Higher Basidiomycetes (ed. Petersen, R. H.) 505–534 (Univ. Tennessee Press, Knoxville, 1971).
2. Thiers, H. D. Mycologia 76, 1–8 (1984).
3. Savile, D. B. O. in The Fungi Vol. 3 (eds Ainsworth, G. C. & Sussman, A. S.) 649–675 (Academic, New York, 1965).
4. Shaffer, R. L. Mycologia 67, 1–18 (1974).
5. Grossman, L. I. & Hudspeth, M. E. S. in Gene Manipulations in Fungi (eds Bennet J. W. & Linda, L.) 56–104 (Academic, New York, 1985).