284 FRYE 
2. Oligotrichum aligerum Mitt., in Journ. of Linn. Soc., 1864, p. 
48, t. 8: 
Name derived from aliger = wing; referring to the conspicuous 
lamellz on the back. 
Plants dioicous, loosely czespitose, gregarious; male plants shorter, 
proliferous from the center of the antheridial disk. Stems 1—3 cm. 
tall, slender, radiculose at base. 

Fig. 6. Oligotrichum aligerum. 
1 = Antheridial plant; d = antheridial disk through which the stem has grown. 
2 = Plant with capsule. 3 = Capsule. 4 = Calyptra, withits few hairs. 5 = Hair 
of calyptra. 6 = Peristome. 7 = Leaf, showing lamelle on upper surface. 8 = 
Leaf-tip. 9 = Cross section of leaf showing lamellae. (After Sullivant). 
Leaves open or spreading, oblong-lanceolate, smooth, blunt, 
pointed, with lamelle on both sides. Margin plane, entire at base- 
short-dentate above middle. Lamelle on upper side 5—7,° wavy 
from side to side; lamelle on back 6—8, high, dentate. Vein per- 
6 Brotherus, in Engler & Prantl: Die natiirlichen Pflanzenfamilien, Teil. 1, Abt. 3 
s. 674, shows 11 in a figure. 
