50 College of Forestry 
has been done in the past, although it seems useless to mul- 
tiply species. In fact Murrill (1907, p. 24) has described 
one of the more aberrant western varieties of the poroid 
form as a distinct species, Coriolus subchartaceus. It should 
not be correct, however, to refer one extreme type of a par- 
ticular plant to a distinct species and at the same time not 
have it include all other closely related types of what obyi- 
ously is the same plant, namely the thinner poroid forms 
1Hies SAL 
Capitate cystidium and basidia of poroid form of 
Polyporus pargamenus, X 2,500. 
