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Plate V. — Pleuridium alternifolium 



(i) Plant, XI. (2) Plant, X3- (3) Spore, X550. (4) Leaf, X32. 

 2. SwARTZiA (Cynodontium, Distichium) 

 Plants in dense matted tufts. Stem dichotomous, tomentose. Leaves in 

 2 ranks, not crowded; vein excurrent in the awn. Calyptra cucullate. Seta 

 pale yellow, long, slender, twisted. Capsule small; lid conic; peristome single, 

 divided to base; teeth 16, perforate or split. Spores rough. — ^(Honor of Olaf 

 Swartz, an 18th-century botanist.) 



la. Leaves very rough at apex; capsule erect, cylindric,. about 3-4 times as 

 long as wide. 



Swartzia montana^ (Lam.) Lindb. — Arctic America to Wash, and 

 Ariz.; northeastern N. Amer. 



Plate VL — Swartzia montana 

 (i) Plant, XI. (2) Leaf, X18. (3) Cross section of leaf-vein, X 400. (4) 

 Portion of subula about its middle, X400. (5) Leaf-tip, X400. (6) Cells of leaf- 

 middle, X400. (7) Cells of leaf-base, X400. (8) Capsule, X22. 



Distichium capillaceum. B. S. G. 



