185 
Gametophyte in dense glossy yellow-green mats ; stems creep- 
ing, closely applied to the substratum, rhizome like, 4-6 cm. long, 
sending up erect julaceous, densely foliate branches ; branches 
terete-foliate, 5-20 mm. long; branchlets few; branch leaves 
erect, closely and regularly imbricate, broadly ovate-lanceolate to 
triangular-ovate, cordate-auriculate, 1.5—2 X 0.6—0.8 mm., concave, 
2 to 4 times plicate, distantly and finely denticulate; costa extending 
24 —34 length of leaf; median leaf-cells linear, 12-15 : 1; basal and 
alar cells rhomboidal to quadrate; stem leaves broader, deltoid 
to triangular-ovate : dioicous (?) ; perichaetium 2.5 mm. long ; the 
leaves sheathing at base with loosely erect tips ; the inner ovate to 
ovate-lanceolate, abruptly narrowed to a long filiform acumination, 
distantly dentate-serrate above, thinly costate; the outer more 
strongly serrate and nearly ecostate. Sporophyte 15 to 25 mm. 
high ; seta smooth, dark chestnut; capsule dark chestnut, 2-2.5 
mm. long without operculum, oblong-cylindric, erect and sym- 
metric; teeth of peristome dark red-brown; segments narrowly 
linear, from a rather narrow basal membrane, yellow-brown ; cilia 
single, slender. 
Type locality, on palmetto trunks, St. Augustine, Fla., Feb., 
1877 (J. Donnell Smith); on roots of cypress, Roseville, Fla. 
(J. D. S.); Louisiana (Langlois). SE 
No capsules except such as were old and deoperculate have 
been seen. The species is beautiful and distinct. It is distin- 
guished from B. &ventrosum by its much greater size and brilliant 
color and lustre. Austin’s type is a small form of the species ; 
this, perhaps, led him to confuse it with B. dzventrosum. 
16. BRACHYTHECIUM BIVENTROSUM C. Muell. Bull. Torr. Club, 5: 
49. 1874. 
Gametophyte loosely caespitose, light green ; plants small and 
slender ; stems creeping, subpinnately branching ; branches slender, 
3-8 mm. long, julaceous, terete-foliate ; branch leaves appressed- 
imbricate, lanceolate to narrowly ovate-lanceolate, gradually nar- 
rowed to a long slender point, serrulate with small distant teeth, 
concave or bisulcate at base; costa extending 24 the length of 
the leaf; median cells linear, 10—13:1; basal cells shorter 
