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Flowei-s monoecious or dioecious.
100. H. trich o p h o rum , Spmce. Tufts white, dark green ;
plants prostrate, nuich branched: leaves distichous, flattened,
ovate or oblong, concave, filiform-apiculate, irregularly undulate!
plicate lengthwise, recurved, entire on the borders, marked at
base by double short striæ instead of nerves; areolation loose,
hyaline; perichætial leaves flliform, acuminate, flexuous at the
apex: capsule suberect or subincurved, oblong, a little constricted
under the orifice when dry and empty, slightly inflated
at the collum, brown, darker when old;, operculum conical, in-
fl.ated at base, muticous ; peristome pale, soft, the teeth linear-
lanceolate, sometimes bifid or irregularly perforated at the apex,
the segments split or lacerated between the articulations, whitish
when dry, hyaline when moist; ammlus of a triple series of
small cells rem.aining attached to the lid. —Ann. M,ag. Nat. Hist,
ser. 3, 111. 276. Leskea pilifera, Swartz, Siimm. Veg. Scand. 41.
Plagiothecium piliferum, Bruch & Schimp. Bryol. Eur. t. 496.’
II. denticidatum, var. Donianum, Drummond Muse. Amer.
n. 165.
IIab. Portage River, British America {Drummond) ; Oregon (Ilall).
* * Teeth more densely articulate; basilar membrane broader ;
segments with intermediate cilia : leaves two-ranked. ’
101. H. p u lc h e llum , Dicks. Monoecious: plants small,
densely cespitulose, glossy green; branches crowded, erect,’
fastigiate: leaves crowded, subcomplanate, secund, lanceolate
or gradually tapering from the base to an acute point, entire,
ecostate : capsule suberect, oblong or obovate ; operculum short,
conical, obtusely apiculate; peristome pale yellow; cilia two,’
a little shorter than the segments. — Crypt. Fasc. ii. 13, t. 5.
Leskea pulchella, Hedw. Spec. Muse. 220, t. 55. Plagiothecium
pidchellum, Bruch & Schimp. Bryol. Eur. t. 497. Stereodon
ptdchellus, Mitt. Journ. Linn. Soc. viii. 39. Plagiothecium
nitidum, var suberectum, Lindb. Faun. Flor. Fenn. ix. 34.
Var. n itid u lum . Plants slightly stronger and less compact :
leaves longer and long-acuminate : capsule thicker, ovate-oblong,
mclined or subcernuous. — AZ nitidulum, Wahl. FI. Trapp. 370.
Plagiothecium nitidulum, Bruch & Schimp. 1. c., t. 498 P
mtidum, Lindb. 1. c. Isopterygium nitidum, Lindb. Muso
Scand. 39.
H a b . Rocky Mountains (Drummond). The variety on roots of trees
near the gronnd ; New York (C. II. Peck, Austin) ; Fort Colville (Lyall).
Also a form from Davis Straits (Taylor), according to Mitten.
102. H. geminum. Monoecious : branches ascending, interlaced
: leaves ovate or ovate-acuminate, open, variously curved,
subsecund or subfalcate, the borders minutely serrulate or entire ;
costa thick, ascending to the middle ; cells long and narrow, a
few of them shorter at base ; perichætial leaves erect, the inner
broader and longer, short-acnminate : capsule oval-cylindrical,
suberect, gradually narrowed at the neck; segments narrow;
cilia two, nearly as long. — Stereodon geminus, Mitt. Journ.
Linn. Soc. viii. 39, t. 7.
I Ia b . Rocky Mountains, at 6 ,0 0 0 to 8 ,0 0 0 feet altitude ; associated with
the last (Lyall).
Somewhat like II. pulchellum, but witli leaves more gradually narrowed
from a wider base, tlie thin but broad nerve continued to the niiddle, the
margins more or less evidently serrulate from tlie base to the apex, and
tlie cells only half as long and narrower. — (Mitten.)
103. H. m ic an s, Swartz. Monoecious : plants small, in
very loose flat tufts, whitish yellow or fulvous, shining ; stems
prostrate, rooting, irregularly divided into few branches and
short branchlets : leaves loose, compi-essed, the lateral spreading
at right angles, thin, soft, ovate-lanceolate, narrowly acuminate,
obscurely serrulate above ; costa basilar, gemmate, indistinct ;
cells narrowly linear, those of the .angles few, quadrate-oblong;
inner perichætial leaves more or less abruptly acuminate, coarsely
serrate at the base of the point : capsule very small, ovate-ohlong,
slightly incurved on a slender comparatively long pedicel; lid
conical, short-acuminate or mamillate ; segments nearly entire,
as long as tho teeth ; cilia one or two, short, nodose. — Muhl.
Cat. 104, and Adnot. Bot. 175, according to authentic specimens
in Muhl. Herb, examined by Sullivant and reported upon by
letter to James and Austin. II. albidum, Muell. Syn. ii. 280;
Sulliv. Mosses of U. States, 71, and Icon. Muse. 179, t. 112.
II. tenerum. Hook. & Wils. in Drumm. Muso. Amer. (Coll. II.),
n. 108, 109.
Var. fu lv um . Larger ; branches long, flattened, sometimes
floating, fulvous or dark brown when old. — II. fulvum. Hook.
& Wils. in Drumm. 1. c., ii. 110 ; SuUiv. 1. c. 80, and Icon. Muso.
205, t. 125.
H a b . On much decayed wood in moist places; the variety in bogs;
Southern States.