THE POLYTRICHACEZ OF WESTERN NORTH AMERICA 28 5 
current or vanishing, keeled. Cells round-quadrate, distinct. Peri- 
chetial leaves ovate, sheathing at base, erect, narrower, subulate to 
apex, their cells round and pellucid. 
Calyptra with a few hairs above. 
Capsule long, subcylindric, slightly arcuate, contracted under the 
mouth, ventricose below, with numerous stomates.— On wet clay 
banks.— Rocky Mountains and coast of British Columbia; 
Washington; Oregon. 
3. Oligotrichum incurvum (Huds.) Lindb., in Hartm. Skand. FI. 9 
eate22 1. 45) (1804) 
Oligotrichum hercynicum Lam. & DC. FI. Fr. 3 ed.,2:492 (1805). 


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Fig. 7. Oligotrichum incurvum. 
1 = Plant with capsule, dry, X 1. 2 = Moist plant, X 1. 3 = Capsule, X 5. 
4 = Peristome, X 150. 5 = Leaf showing upper side with lamelle and in- 
curved margin, X 15. 6 = Leaf from back showing ridges, those on vein toothed, 
x 15. 7 = Leaf-tip showing serration of margin, X 65. 8 = Cross section of leaf 
showing lamelle on upper side and ridges on back, X 65. 9 = Cross section of leaf 
margin X 250. 10 = A few lamelle in cross section, X 250. 
