TO 

 SIR WILLIAM T. THISELTON-DYER, 



K.C.M.G., C.I.E., LL.D., SC.D., M.A., F.R.S., 

 EMERITUS DIRECTOR, ROYAL BOTANIC GARDENS, KEW, 



to whom I am greatly indebted for much kindly encourage- 

 ment in connection with my work, both previous to and 

 during my official tenure at Kew ; I have great pleasure in 

 dedicating this attempt to introduce to English students 

 those features which collectively constitute the 

 study of Mycology, as understood 

 at the present day. 



GEO. MASSEE. 





