[DICRANELLA. Plant smaller than in _Dicranum_, and less robust, areolation rectangular at the base, in other respects similar.]
LEUCOBRYUM (17). Caps., lid and peristome as in _Dicranum_. Leaves spongy, composed of a double layer of loose cellular tissue, white or pale glaucous green, sub-secund, nerve indistinct. 49.
FISSIDENS (71). Caps. cernuous or erect, more or less truncate, teeth long and tapering from a lanceolate base, cleft half way into unequal segments, geniculate, barred; fruit in some species _cladocarpous_, leaves vertically distichous. 135.
CERATODON (18). Caps. sub-cylindrical unequal, with a short ventricose or strumose neck; teeth deeply cleft, or of two equal subulate portions connected below by prominent trabeculæ, of two differently coloured laminæ, the outer red, the inner and broader yellow. 49.
CAMPYLOPUS (20). Caps. oval or oblong, regular or gibbous on upper side, tapering at base, striated, lid conico-subulate or rostrate, teeth deeply bifid; calyptra large, fringed at base; leaves with a broad nerve. 50.
DICRANODONTIUM (19). Caps. elliptical smooth, teeth linear-lanceolate, cleft nearly to base into unequal portions, obliquely striate; calyptra not fringed at base. 49.
* * * * Teeth 32, in pairs, narrow or filiform.
DIDYMODON (25). Caps. erect, sub-cylindrical, teeth 32 (16 Wilson) linear-lanceolate, _not obviously united by a basilar membrane_, tender and fugacious, entire or perforate. 58.
TRICHOSTOMUM (26). Caps. erect, sub-cylindrical or oval, smooth, teeth 32 in unequal pairs (often so united as to appear 16 simple or perforate teeth), connected by a narrow basilar membrane, persistent. 60.
DISTICHIUM (24). Caps. as in last; teeth 32 (16 Wilson) not confluent at base, linear-lanceolate, entire, perforate or cleft, with a medial line; leaves _distichous_, setaceous from a sheathing base. 58.
TORTULA (27). Caps. mostly erect ovate-oblong, smooth, teeth 32 very long filiform _twisted_, articulate papillose, outer cellules yellow, inner red, often united into a membrane at base; leaves not distichous. 63.
CINCLIDOTUS (28). Caps. immersed ovate or oval, smooth, teeth 32 perfect or rudimentary, adhering at top to columella, contorted, anastomosing at base. 74.