81 
148. Leucolepis. Stem-leaves (principally above) 
with elongate cells; branch-leaves with round-polygonal, 
small cells. Capsule symmetrie; endostome orange; cilia 
not appendieulate. Habit of Thamnium. 
B. Stem not tree-like. 
a. Capsule lateral. 
Il. Rhizogoniece. Capsule asymmetric and curved, 
149. Rhizogonium. Leaves smooth, setiform; upper 
cells small and rotundate, the basal ones subquadrate. 
b. Capsule terminal. 
aa. Leaves sheathing; upper cells usually papillose. 
Ill. Zimmiec. Capsule symmetric. Leaf-cells small, 
round-hexagonal. 
150. Timmia. Capsule not striate. Habit of Poly- 
trichum. 
bb. Leaves not sheathing, smooth or (in some species 
of Aulacomnium) papillose above. 
IV. Aulacomniec. Leaves usually papillose; cells 
small, generally rotundate. Capsule ae asymmetric, 
usually striate when dry. —— 
151. Aulacomnium. Stem often with pseudopodia 
(sterile gemmiform shoots). 
V. Mniece. Leaves smooth; cells polygonal, mostly 
. large. Capsules generally symmetric, not striate, often 
clustered Subterranean stem generally rhizomatic, often 
stoloniferous. Lowest leaves mostly squamiform. Tufts 
generally loose. 
152. Mnium. Capsules symmetric, often clustered ; 
1 endostome orange; cilia not or indistinctly appendiculate. 
Leaves serrate or entire; cells nearly uniform, generally 
us tound-hexagonal, in one species suboval-oblong. . Para- 
.— Pphyses claviform. | 
7 153. Roellia (new genus). chews nues, soli- 
~ tary; endostome hyaline; cilia not appendiculate. Leaves 
a serrate; cells diversiform, mostly vote doen or n a: : s 
uppermost oblong-oval. 
