— 47 — 
lb. Outer walls of the surface cells of the stem normally without pores; (2) stem- 
leaves not or only slightly lacerate at tip. 
3a. Hyaline cells of the branch-leaves bulging yi-yi their thickness on the 
outer side. 
4a. Plants brownish-green rather than reddish-green; (5) outer surface 
of the branch-leaves with rather large elliptic pores. 
Plate XXIII 
(1, 2) Stem-leaves, X 22. (3, 4) Portions of tips of stem-leaves, X 32. (5, 6) Hyaline cells 
from middle regions of leaves of spreading branches, showing pores on outer side, X 343- (7, 8) 
Portions of cross sections of leaves of spreading branches, X 400. 
