284 



FRYE 



2. Oligotrichum aligerum Mitt., in Joiirn. of Linn. Soc, 1864, p. 



48, t. 8. 



Name derived from aliger = wing; referring to the conspicuous 

 lamellae on the back. 



Plants dioicous, loosely caespitose, gregarious; male plants shorter, 

 prohferous 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 7.-ith capsule. 3 = Capsule. 4 = Calyptra, with its few hairs. 5 = Hair 

 of calyptra. 6 = Peristome. 7 = Leaf, showing lamellae on upper surface. 8 = 

 Leaf-tip. 9 = Cross section of leaf showing lamelL-e. (After SuUivant). 



Leaves open or spreading, oblong-lanceolate, smooth, blunt, 

 pointed, with lamellae on both sides. Margin plane, entire at base- 

 short-dentate above middle. Lamellas on upper side 5 — 7,^ wavy 

 from side to side; lamellae on back 6 — 8, high, dentate. Vein per- 



' Brotherus, in Engler & Prantl: Die natiirlichen Pflanzenfamilien, Teil. i, Abt. 3 

 s. 674, shows 1 1 in a figure. 



