Russulaceae of Kumaon Himalaya is divided into three parts. The first part is the "Introduction" giving a general account of the work done on Russulaceae both at international and national level and justifying the objectives of the study. The chapter on "technical terms" deals with the terms used to designate the characters in Russulaceae of Kumaon Himalaya. This is followed by a chapter on "methodology" depicting the methods of work followed during the course of this study. The chapter on "study area" gives a summary of the different areas surveyed with their names, type of forests, dominant tree species and approx. altitude in meters above mean sea level. The second part deals with the detailed taxonomical descriptions coupled with field photographs, line drawings depicting the macro-and microscopic characters of all the taxa collected from the study area and a parsimonious molecular tree justifying the placement of few confusing taxa. The third part is about the "ecological data" gathered on each taxon during the field survey.