89 
contracted to a subclasping decurrent base with paraphyllose af- 
pendages; margins entire or sinuate-serrulate; costa vanishing 
above the middle; leaf-cells oblong-fusiform to linear-rhomboidal, 
with a darge papilla at the distal end of each below, nearly smooth 
above; branch-leaves ovate or ovate-lanceolate acuminate, sud- 
crispate when dry. Monoicous; perichetial bracts entire or den- 
ticulate; capsule oblong-cylindrical, curved, horizontal; cilia 3; 
segments scarcely rimose; annulus compound; operculum coni- 
cal; spores smooth, .o12 to .O14 mm. 
On wet marshy ground, with a northern range. Greenland 
(Fl. Gr.); Labrador (Waghorne); Canada and British Columbia 
(Macoun); southward to Idaho (Leiberg); Colorado (Wolf & 
Rothrock); Ohio (Sullivant); New York (Clinton); Vermont 
(Faxon), 
Type locality, Megapolitania, Germany. 
ILLust, Schwaegr, Suppl. 2: 1, 158. pl. rg2. 1824. 
Br. & Sch. Bryol. Eur. 5: p/. 486. 1852. 
Husnot, Muscol. Gall. g/. 89. 1894. 
Exsic. Drumm. Musc. Bor. Am. ed. 1, no. 215. S. & L. 
Musc. Bor. Am. ed. 2, no. 414. Aust. Musc. App. no. 305. 
Macoun, Can. Muse. no. 274. 
Rem. Involute forms are found as far south as New Jersey 
and generally referred to the following species. The relation be- 
tween 7h. paludosum and Th. Blandowt is very close, and speci- 
mens are occasionally met with,a satisfactory reference of which 
is very difficult. It is probable that the former is a derivative 
from the latter, the difference due to a more southern habitat with 
a consequent tendency to spread to drier situations. 
11. THurpium PALuDosuM (Sulliv.) Rau & Herv. 
Hypnum paludosum Sul). Musc. All. No. 7. 1846. Mosses 
U.S., 68. 1856. 
Elodium paludosum Austin, Musc. App. no. 306. 1870. Ren. 
& Cardot, Musci Am. Sept. 63. 1893. 
Thurdium paludosum Rau & Herv. Cat. 38. 1880. 
Plants of medium size, in spreading mats, yellow-green ; stem 
4 to 6 cm. long, pinnately branched; branches simple, spreading, 
subcompressed ; paraphyllia numerous, geniculate-branching, fila- 
mentous; stem leaves rather ngid, plicate-striate, oblong-lanceo- 
late, acuminate, the subdecurrent base usually with 7 fo 3 cilia, 
margins revolute below, recurved above, sinuate-serrulate, costa — 
subpercurrent; \eaf-cells oblong to linear-rhomboidal, smooth (in 
