11 1 its numerous varieties tins species seems to pass into the last. Tliere
is, however, a constant difference in its more rigid leaves, broader and
cordate at base, the costa stouter and percurrent, and the areolation
sliorter and tliick. The capsule is generally more solid, of a unifoiiu
brown color, not red at the mouth; the operculum a little longer, sharply
acute and often rostellate.
121. H. o r th o c la d o n , Beauv. Plants in large deep somewhat
loose dark green tufts ; branchlets numerous, erect, 1 or 2
c.m. long or more : stem-leaves broadly ovate-cordate at base,
acuminate, those of the branches narrower, open-ereot, concave,
entire or obscurely serrulate ; oosta thick, subpercurrent ; colls
thick, chlorophyllose, subrhomboidal ; perichætial leaves erect,
the inner membranous, plicate-striate, distinctly and obtusely
dentate above, cuspidate by the excurrent very broad costa:
capsule large, loiig-cylindrioal, narrowed into a long collum,
slightly incurved, cernuous, yellowish brown; pedicel long,
flexuous, red; operculum large, highly convex, conical-apiculate;
peristome of II. serpens; annulus simple, narrow.—
Prod. 72; Sulliv. Icon. Muso. 199, 1.122. II. varium. Hook. &
Wils., Drumm. Muse. Amer. (Coll. II.), n. 142. II. serpens, var.
varium, Muell., in part. II. serpens, var. orthocladon, Aust. 1. c.
Hab. Margins of swamps and springy places, on the ground, on stones,
and decayed logs; very common, and very difficult to separate from the
last species.
122. H. irrig u um . Hook. & Wils. Plants drooping, cespitose
; stems rigid ; branches suhpinnately ramulose : leaves
solid, spreading and subsecund, opaque, deltoid-ovate, ohcordate
or decurrent at base, acuminate, subserrulate, costate to the
apex; basilar areolation much enlarged: capsule oblong or
strongly arcuate and contracted below the mouth when dry,
pale brown; operculum as in the last species; teeth orange
below, with a broad hyaline border ; annulus of a triple series
of cells. —Wils. Bryol. Brit. 361. AmUystegium fluviatile,
Bruch & Schimp. Bryol. Eur. t. 566, not Swartz.
Var. spinifolium. Tufts greenish black ; stems long, rigid,
thick, immersed, flexuous, prostrate, irregularly pinnate : leaves
appressed, strict, solid, narrower, sublinear, cuspidate by the
very thick excurrent costa. — H. fluviatile, James, Proc. Acad.
Phil. 1855, 447. H. noterophilum, Sulliv. & Lesq. Muse. Bor.-
Amer. Exsicc. n. 348 ; Sulliv. Mosses of U. States, 78.
H a b . Niagara Falls, Trenton Falls, and Little Falls, New Jersey; the
variety in limestone springs, Pennsylvania [Porter).
123. H. fluviatile, Swartz. Tufts flat, soft, dirty green ;
stems with few radicles, prostrate, denudate of leaves in the
lower part by maceration ; branchlets few, suberect : leaves
more or less remote, open, ovate or oblong-lanceolate, concave,
the borders recurved at base ; costa very thick, abruptly dissolved
below the apex ; areolation very loose, oblong-ovate,
larger at the base, but uniform ; perichætial leaves erect, oostate :
capsule long-cylindrical, arcuate, solid, yellowish brown ; peristome
normal.-—Muse. Sueo. 63. Amblystegium fluviatile,
Bruch & Schimp. Bryol. Eur. t. 567.
H a b . On rocks, Closter, New Jersey (Austin); Ontario (Mrs. Roy).
124. H. adnatum, Hedw. Plants depressed, in wide flat
pale green or yellowish mats; stems creeping, irregularly
branching, closely ramulose ; branchlets short, distichous : leaves
close, erect-spreading, ovate or oblong, gradually aouminate,
very concave and entire, ecostate or shortly histriate at base ;
areolation pellucid, subrhomboidal, prosenoliymatous, elongated
at base, smaller, quadrate and opaque at the basilar angles;
outer perichætial leaves ovate, narrowly aouminate, spreading,
the inner larger, erect, oblong, abruptly acuminate, coarsely and
irregularly dentate below the point, more distinctly costate to
the middle : capsule erect, cernuous, oblong, unequal, gradually
narrowed to a short pedicel, reddish above, yellowish below ;
operculum pale, convex-conical, more or less long-pointed ; teeth
yellowish; cilia one or two, nearly as long as the entire segments;
annulus persistent.— Spec. Muse. 248, t. 64; Sulliv.
Mosses of U. States, 78, and Icon. Muse. 197, t. 121.
H a b . Shady woods on stones or on trees near the surface of the
ground ; common and variable.
125. H. comp actum, Muell. Plants small, in very compact
tufts, reddish brown within, greenish on the surface ; stems
slender, 2 or 3 c.m. long, erect, fasciculately ramose, tomentose-
radiculose to near the apex ; branches closely foliate : leaves
erect-spreading, ovate-lanoeolate, gradually acuminate, deourrent
at base, concave, serrulate on the borders especially below,
thickly costate to near the apex ; areolation loose, narrowly
rhomhoidal, fusiform, with few smaller quadrate al.ar cells ;
perichætial leaves ohlong, more abruptly acuminate, distinctly
serrulate at the apex, narrowly costate : capsule erect or slightly
inclined, oblong, thin, constricted under the broad orifice, long