282 FRYE 



THE WEST NORTH AMERICAN SPECIES, A COMPARISON AND KEY. 



I. Lamellae straight; capsule with few stomates. 

 2. Leaf margin plane. 

 3. Lamellae on upper side 4-7 ; 3-6 cells high. 

 4. Lamellae on back low or wanting i. 0. paralleliim. 



I. Lamellae wavy from side to side; capsule with numerous stomates. 

 2. Leaf margin plane. 

 3. Lamellae on upper side 5-7 ; 3-7 cells high. 



4. Lamellae on back high 2. 0. aligerum. 



2. Leaf margin incurved. 

 3. Lamellae on upper side 10-13; 6-12 cells high. 



4. Lamellae on back low or wanting 3.O. incunum. 



1. Oligotrichum parallelum (Mitt.) Kindb., in Eur. and N. Amer. 



Bryin., p. 156, (1897). 

 AtricJmm parallelum Mitt., in Journ. of Linn. See, 1864, p. 48, t. 8. 

 Atrichum leiophyllum'^ Kindb., in Bull. Terr. Bot. Club. 17: 275, 



(1890). 

 Oligotrichum leiophyllum Kindb., in Eur. and N. Amer. Bryin., 



p. 156 (1897). 



Probably so named because there are often tooth-like processes 

 parallel to the vein on the backs of the leaves. 



Plants dioicous, loosely caespitose, dark green; antheridial plants 

 more slender, the antheridial disks cupshaped. Stems simple, 

 erect, 1—3 cm. tall. 



Upper leaves half open, incurved when moist, slightly undulate, 

 ligulate-lanceolate, often marked on the back by small thin tooth- 

 like processes parallel to the vein; lower leaves shorter, oblong, more 

 obtuse. Margin plane, sharply dentate from the middle or below. 

 Lamellae on upper side4 — 7, straight. Vein percurrent, sometimes 

 with 1 — 3 longitudinal dentate lamellae on back. Cells round- 

 hexagonal, basal cells narrow. Perichaetial leaves oblong, convolute 

 at base, gradually narrowed, lanceolate. 



Capsule as 1:3—4, subcylindric, slightly arcuate, contracted 

 under the mouth, with few stomates. — On soil. — Kodiak Island, 

 Port Etches, and Douglas Island, Alaska; Vancouver Island, and 

 Rocky Mountain region of British Columbia; Washington. 



* See Proc. Wash. Acad. Sci., 4: 326, (1902). 



