“In the course of time, more than 69,000 species of fungi have been recognized and described. It has been estimated that the total number of fungal species, known and as yet unknown, is of the order of 1.5 million.

A comprehensive list of all fungi that have been incriminated as opportunistic human pathogens may well exceed 400 species.”

Source: Principles and Practice of Clinical Mycology – Page 1 By C. C. Kibbler