The number of species in 1889 was estimated by Saccardo at about 32,000, but of these 8500 were so-called Fungi imperfecti - i.e.
Forms of which we only know certain stages, such as conidia, pycnidia, &c., and which there are reasons for regarding as merely the corresponding stages of higher forms. Saccardo also included about 400 species of Myxomycetes and 650 of Schizomycetes.
Saccardo (1882-1892), of Oskar Brefeld and Von Tavel (1892), of P. E.
P. 77 (1893), and the works of Brefeld, Engler and Prantl, von Tafel, Saccardo and Lotsy already cited.