ON CERTAIN LEAF-HAIR STRUCTURES. 255 
In the genus Notholena we have also a group of species 
characterized by the presence of these glands and called the 
Circinalis division. The species are as follows: 
N. trichomanoides, R. Br. A native of J amaica and Cuba. 
It bears a white powder and ferruginous woolly-hairs. 
NV. affinis, Hook. A native of Guatemala and Mexico. It 
bears a sulphur colored meal. 
NV. sulphurea, J.8m. Ranges from California and New 
Mexico along the Andes for some distance. Its indument is 
white or yellow. 
NV. flavens, Moore. Inhabits Central America and bears a 
dense bright yellow indument. 
NV. Hookeri, Eaton. Found on the Andes from Mexico to 
Peru. It bears a very light yellow powder. 
N. Chilensis, Hook. A native of Juan Fernandez. The 
indument is white. ; 
NV. dealbata, Kunze. Inhabits Missouri. The dense coat- 
ing of fine powder is pure white in color. 
NV. Fendleri, Kunze. <A native of New Mexico. Its indu- 
ment is white. 
N. Lemmoni, Eaton. Found in Mexico and is sparingly 
coated with a white powder. 
Of these species I have only examined N. Hookeri and N. 
Lemmont. In the former species the glands consist of two- 
celled stout thick hairs whose apical cell is but slightly more 
developed than the lower one. 
The indument is crystalline, lemon yellow in color, and is 
readily soluble in alcohol and ether. I could discover no 
difference between it and the indument of G. triangularis. 
The hairs of N, Lemmoni bear a very close resemblance to 
