times recurved; costa sometimes simple. Capsule usually 
20 
simple. Stem bi-tripinnate; the naked part long; para- 
phyllia numerous. : 
IV. Thamniece. Upper leaf-cells generally round- 
rhombic, the middle suboval. : 
40. Thamnium. Endostome with appendiculate cilia. 
Pedicel of the capsule smooth. Alar leaf-cells few, small 
and not much distinct; costa simple. Stem with fasciculate 
branches or pinnate; the naked part mostly long; para- 
phyllia none. 
Fam. 12. Thuidiacez (new fam.) 
A. Costa of the leaves short, mostly double, or — 
indistinct. y 
a. Leaves erect or appressed when moist, not 
recurved; costa double or indistinct. Capsule suberect. 
Branches erect; paraphyllia wanting. 
41. Myurella. Leaves cochleariform; cells rotun- 
date. Branches julaceous. eui 
b. Leaves patent or spreading when moist, some- 
inclined. Branches decumbent; paraphyllia few or wanting. 
42. Heterocladium. (haves spreading and claviculi- 
form or subfaleate when moist, generally dimorphous; 
those of the stem seldom appressed when dry; middle cells 
oval-oblong. 
48. Pseudoleskeella (new genus.) Leaves not sprea- 
ding when moist, appressed when dry, not seldom homo- 
morphous; cells generally round-oval. 
. B. Costa of the leaves long and simple, tios 
subpercurrent. ; 
44. Pseudoleskea.. Leaves homomorphous. Stem 
not regularly pinnate. 
Leaves sometimes not papillose, not seldom folcale, 
mostly patent when dry; cells oval-oblong or narrower. 
Stem usually with paraphyllia. : 
. 4b. Thuidium. Leaves dimorphous. Stem pinnate. 
Leaves xus Papilio not falcate, appressed or 
