224 
IOWA ACADEMY OF SCIENCE Voi. XXVIII, 1921 
Numbers 1, 2, 3, 6, and 7 are from Johnson county; 4 is from 
Iowa county ; 5 from Louisa county ; and 8 from Lee county. 
It is evident that the variation in leaf-characters is much greater 
than the keys and descriptions would indicate. This is especially 
true of the number and height of the lamellae. The character of 
the leaf-surface is also a more or less variable quantity. Number 
8 is distinctly papillose, and seems to be typical Macmillani, but 
Nos. 2, 6 and 7 also show papillae more or less distinctly. Of C. 
Macmillani Holzinger says^ that ‘‘this species is at once distin- 
guished by its papillose leaves.” Unless some other distinguishing 
characters can be found it seems that C. Macmillani should be re- 
ferred to angustata. Perhaps it might stand as C. angustata var. 
Macmillani (Holz.). 
Department oe Botany 
State University 
1 Minnesota Botanical Studies, 1903, No. XII, p. 120. 
