S. TENELLUM 
Plate XIX 
<j) Cortical cells of the stem, X 125. (2, 3, 4) Stem-leaves, X 22. (5) Hyaline cell from 
middle region of leaf of spreading branch, showing pores on inner side, X 343. (6, 7) Hyaline 
cells from the middle portions of the leaves of spreading branches, showing pores on outer side, X 
343. (8, 9, 10) Portions of cross sections of leaves of spreading branches, X 400. 
Group 3 
la. Green cells of the branch-leaves in cross section about equally exposed on the 
2 surfaces, truncately elliptic; hyaline cells of the branch-leaves bulging 
more on the outer side; (2) stem-leaves longer than wide, mediumly large, 
(3) somewhat lacerate at tip; (4) hyaline cells of the branch-leaves with 
6-14 medium-sized pores on the outer side and 2-8 pores on the inner. 
Sphagnum angstroemii Hartm. — -Alaska; Yukon (PI. XX). 
