-56- 



near the tip; (4) seta red below, paler above, 1-2 cm. long; (5) stems 

 up to ICQ mm. long. 



Ditrichum flexicaule^^ (Schwaegr.) Hampe— Alaska to B.C.; north- 

 eastern N. Amer. 



2b. Marginal 2 or more rows of cells at leaf-middle square or nearly so, 

 not irregular; (3) leaf-margin incurved, serrulate above; (4) seta 

 pale yellow, 1.5-2.5 cm. long; (5) stems up to 10 mm. long. 

 Ditrichum montanum Leib.— Wash, and Idaho. 



Plate XIII. — Ditrichum Schimperi 

 (i) Leaf, X22. (2) Leaf, X22. (3) Leaf, X22. (4) Cells of leaf-base, X 400. 

 (5) Cells of leaf-middle, X400. (6) Leaf-tip, X400. (7) Capsule, X18. 



2c. Marginal 2 or more rows of cells at leaf-middle rectangular and about 

 2-4 times as long as wide. 

 3a. Leaves not revolute, almost entire, abruptly narrowed; (4) seta dark 

 red, 1-2.5 cm. long; (5) stems up to 10 cm. long. 



Trichostomum flexicaule B. & S.; Distichium macounii Miill.; Leptotrichum flexicaule hrevi- 

 folium Kindb.; Ditrichum brevifolium Paris; Ditrichum flexicaule brevifolium Barnes; Ditrichum 

 elatum Kindb. 



