— 45 — 
outer side; (4) plant yellowish-green or brownish-green; (5) outer surface 
of the branch-leaves with rather small elliptic pores. 
Sphagnum girgensohnii Russ. 11 — Alaska to Oreg.; northeastern N. 
Amer. (PI. XXII). 
Plate XXI 
(1) Cortical cells of the stem, X 125. (2, 3, 4) Stem-leaves, X 22. (5) Margin of branch- 
leaf, X 250. (6, 7, 8) Hyaline cells from the middle regions of leaves of spreading branches, show- 
ing pores on outer side, X 343. (9, 10, x 1) Portions of cross sections of leaves of spreading branches, 
X 400. 
11 S. mehneri Warnst. 
