THE BRYOLOGIST 
Vol. XXI January, 1918 No. 1 
THE RHACOMITRIUMS OF WESTERN NORTH AMERICA 
[ Concluded ] 
T. C. Frye 
4. Rhacomitrium cyclodictyon Card. & Ther. Proc. Wash. Acad. Sci. 
4: 308. 1902. 
Plants densely caespitose, small, blackish-brown or reddish-brown. Stems 
depressed, 6 cm. or less long, pinnately much-branched; branches crowded, 
erect, short, 3-5 mm. long; short tuft-like lateral branches wholly wanting. 
Leaves when dry suberect, hardly flexuous; when moist erecto-patent ; up to 
1.25 mm. long, up to .5 mm. wide, ovate-lanceolate, muticous; margin entire, 
revolute below, only 1 cell thick throughout; vein somewhat slender, 35-40/* 
Plate I 
Rhacomitrium cyclodictyon. (1) Plant, Xi. (2) Leaf-tip, X400. (3) Leaf, X17. (4) Leaf, 
X90. (5) Capsule, X17. (6) Cells of leaf-base, X400. (7) Cells of leaf-middle, X400. (8) 
Part cross section of leaf near its tip, X400. 
The November number of The Bryologist was published December 5, 1917. 
