This book has passed through a number of editions each involving some modifications while retaining the general character of the first. The most substantial changes occurred in the fifth (1983), but that is now out-of-date. Mycology has not been immune from the rapid evolution of biology in the past decade and the preparation was a long way beyond the capacity of the older writer (C.T.I.). So a younger one (H.J.H.) has collaborated with him. Substantial changes have been made throughout, particularly in relation to taxonomy but in general Chapters 1-7 have undergone relatively little...