PLATES 



The preparation of the plates is the work of Miss Gladys Baker. 

 The habit sketches are nearly all hers and a number of her diagrams 

 made from paraffin sections and originally published elsewhere, have 

 been redrawn. Spores, capillitium and other microscopic structures 

 were drawn in pencil, with the aid of a camera lucida, by the junior 

 author, the spores always and the other structures frequently under 

 an apochromatic oil immersion lens. It is hoped that the repro- 

 duction of the spore drawings at a uniform magnification of 1200 

 diameters will facilitate comparison of these critical characters. 



