Field Work in the Genus Russula 



247 



of the different collections as well as the dried ones also agree, 

 then one can arrange a complete description of the species from 

 the descriptions of the various collections taken either the same 

 day, or the same year, or even in different years. 



To summarize, each collection of Russula, to be of value, should 

 include a number of specimens, where possible, showing a grada- 

 tion from young to mature forms and any variations in color or 

 size, one which shows to what extent the cuticle is separable, and 

 a lengthwise section. Accompanying the specimens should be a 

 spore print, and a description containing the points outlined 

 above. To these a water-color sketch would be a valuable 

 addition. 



Many of the species of Russula are edible and occur in some 

 abundance through July and August and the early part of Sep- 

 tember. For the benefit of any who may wish to attempt to 

 identify species of Russula which they may find, I append a short 

 bibliography of American literature on the genus. 



Bibliography 



Burlingham, G. S. Russula. North American Flora 9: 201-237. 19 15. 

 Kauffman, C. H. Michigan Species of Russula. Rep. Mich. Acad. Sci. 11 : 

 55-91. 1909. 



Murrill, W. A. Illustrations of Fungi. Mycplogia 4: 166, 289-293. 1912; 



7: 167, 224. 1915; 8: 121-124. 1916. 

 Peck, C. H. New York Species of Russula. Bull. N. Y. State Mus. 116: 



67-98. 1907. 



