The first edition of the present book, entitled “British cup fungi and their allies,” was welcomed among others with the words “. . . the only reasonably complete synthesis of modern thought on Ascomycete classification known to this reviewer.” (Korf in Mycopath. Mycol. appl. 16: III. 1962). These words have lost nothing of their truth and could have been written with equal justification to greet the second edition; for it continues to be the best general book we have on Ascomycete taxonomy. But is it the kind of book that leaves nothing to be desired? Certainly not. The following may seem, and probably will be considered by some, to be mere details, but I have yet to meet the author who would maintain that details do not matter. Date of publication. — Through no fault of the author the date of publication has been printed as 22.IV. 1968. However, the publisher personally intimated that the first copies were delivered on the 10th of May, 1968.