-96- 



Plate XXI. 



Rhacomitrium aciciilare. (t) Plant, Xi. {2) Leaf-margin near tip, X400. (3) Leaf, Xi7- 

 (4) Portion of cross section through lower part of leaf, X5S0. (5) Plant, Xi. (6) Cross section 

 through leaf-margin near tip, XSSo. (7), (8) Inner perichaetial leaves, X17. (9) Capsule, X17. 

 (10) Cells of leaf-base, X-100. (11) Cells of leaf-middle, X400. (12) Cells of leaf-tip, X400. 



cylindric, not narrowed at the mouth, its body 2.2-2.6 mm. long. Peristome 

 teeth usually divided into 3 or rarely 2 divisions; divisions unequal, smooth. — 

 British Columbia to California. 



