— 12 — 
divided nearly to base into 2 parts. Spores 10-14^. — Alaska and Yukon to 
Oregon and Montana. 
In very dry situations the hyaline points are sometimes much longer than 
the typical eastern form. 
Plate XI 
Rhacomitrium lanuginosum. (1) Plant, Xi. (2) Leaf, X17. (3) Margin of hyaline leaf- 
tip, X400. (4) Parts of leaf-tip, X200. (5) Cells of leaf-middle, X400. (6) Cells of leaf-base, 
X400. (7) Cross section of leaf-margin at base of hyaline tip; xy, boundary line between green 
and hyaline portions,. X550. (8) Capsule, X17. 
