f '
141. H. W a tso n i, Lesq. & James. Dioecious : plants
loosely cespitoso ; stems erect, pinnately ramulose ; branchlets
close: leaves hamate-secund, short and small, broadly ovate-
ohlong, concave at base, lanceolate, more or less long-acuminate,
subulate, very entire, reflexed toward tlie apex, obscurely bicostate
at the base ; areolation very narrow, sliort-vermicular,
unifornr throughout the leaf; inner pericliætial leaves long
lanceolate-aciimiiiate, subulate, thin and whitish, plicate lengthwise
: capsule long, subcylindrical, slightly cernuous, arcuate and
constricted under the orifice when dry; operculum obliquely
rostrate, muticous. — Proc. Amer. Acad. xiv. 138. II. imponens,
James, Bot. King Exp. 410.
IIa b . On rocks, Bear Eiver Cañón, Uinta Mountains, Utah (Wat son).
Comparable to some varieties of II. uncinatum, and considered by Austin
(Bull. Torr. Club, vii. 6) to be Identical with H. pUcatile, Mitt., H.
Ileiifleuri, Juratzka, etc.
SuBGENus XIX. CRATONEURUM.
Plants varying in size, with few branches, regularly pinnately
ramnlose ; stem thick, covered by a dense felt of radicles
and numerous paraphyllia. Leaves cordate-lanceolate, falcate-
secund, thickly costate, densely areolate ; cells linear, tliose of
the deourrent excavate angles loose, dark, siibopaqiie. Flowers
dioecious. Capsule loiig-pedicellate, large, oblong or cylindrical-
oblong, erect at the neck, cernuous, arcuate when dry. Pedicel
smooth.
142. H. fllic in um , Linn. Leaves rigid, ovate-lanceolate,
not silicate; costa stout, percurrent; borders serrulate; cells of
the basilar deourrent broadly excavate angles abruptly enlarged,
orange-color ; perichætial leaves erect, the inner scarcely plicate,
serrate at the apex : capsule cylindrical-ohlong ; operculum
convex-conical, apiculate ; segments slightly cleft ; cilia 3, as
long as the teeth; annulus simple, narrow. — Spec. PI. 1125;
Bryol. Eur. t. 609. Stereodon JUicinus, Mitt. Amblystegium
fllicinum, Lindb.
Var. trich o d e s, Brid. Stems prostrate: leaves smaller,
more rigid, subsecund or spreading. — Muse. Recent. Suppl. iv.
177. H. duhium, Dicks.
Var. gracilescens, Brid. Very slender, prostrate or
creeping, very tomentose : leaves spreading or subsecund, very
small, bright green. — Bryol. Univ. ii. 531.
Var. elatum, Schimp. Plants in soft yellowish brown
tufts; stems 10 to 15 c.m. long, slender, with few radicles and
paraphyllia : leaves minute, ovate-laiiceolate, spreading or subsecund.
Var. Floridanum, Renault. Leaves nearly entire ; costa
narrower, vanishing in the middle, often scarcely distinct;
radicles and paraphyllia rare; cells of the basilar angles thick-
walled.
H a b . Calcareous springs; not rare in limestone regions. The last
variety in Florida (Fitzgerald).
Very variable, especially in the size and thickness of the plants. It
differs from the next in its more slender habit, the leaves much smaller
more solid, not plicate, and with a thicker costa, the areolation shorter
the annulus of a simple row of cells, etc. ’
143. H. commutatum, Hedw. Tufts deep, rigid, bright
or yellowish green at the surface, brown and generally covered
.with a calcareous deposit within; stems dichotomous-cristate
and pinnately ramulose, very long, erect or prostrate: stem-
leaves more distant, deeply cordate, auriculate-triangular at
base, narrowly lanceolate-acuminate, plicate; upper auricles
flat, denticulate, the lower excavate, entire, orange-colored;
costa stout, subpercurrent ; branch-leaves narrower, more
crowded, all twisted at the apex when dry; areolation very
narrow, long-linear, siihflexuous ; inner perichætial leaves long,
narrowly acuminate, deeply plicate and strongly costate : capsule
curved horizontally, cylindrical-ohlong; operculum convex-
conical, acuminate or apiculate; teeth large, orange; annulus
large, compound. —Muse. Frond, iv. 68, t. 24; Bryol. Eur. t.
607. Stereodon commutatus. Mitt.
Var. falcatum, Muell. Stems stouter, neither tomentose-
radiculose nor pinnately ramidose : leaves larger, more solid,
ovate-oblong, less deeply cordate and less decurrent at base;
areolation longer and narrower; costa more prolonged; peristome
small and the annulus narrower. — Syn. ii. 423. II. fa lcatum,
Brid. Muse. Recent, iii. 63, t. 1, fig. 6; Schimp. Syn.
ed. 2, 743. ^
H a e . Wet rocks, Watkins Glen, N. York; Eocky Mountains, S. Colorado
(Rothrock) ; Mono Pass (Bolander) ; the variety iu Colorado.