abruptly narrowly acuminate : vaginule short, hairy : capsule
on a thick pedicel, chestnut-color; jJeristorne dirty yellow;
cilia two or three, stout, as long as the cleft segments ; annulus
very large. — Muse. Frond, iv. 56, t. 22; Bryol. Eur. t. 598.
Ctenidium molluscum, Mitt.
Var. co n d e n sa tum , Schimp. Drooping tufts densely
intricate, velvety ; stems shorter, more robust, less regularly
piimate: leaves broader falcate, the apical close, pectinate,
hooked : capsule shorter-pedicellate. — Syn. 632.
Var. erectum , Schimp. 1. c. Stems erect, less divided;
leaves narrow.
Hab. Stones and rocks, shaded hills and woods, mostly in mountain
regions.
SüBGENüs XXIII. HYPNUM, proper. (PL 6.)
Stems generally creeping, more or less regularly pinnate-
ramulose. Leaves close, falcate-secund, very rarely equally
spreading, ovate-lanceolate, narrowly acuminate ; areolation
linear, minutely quadrate at tlie angles; inner perichætial
leaves sulcate; paraphyllia few. Capsule cylindrical-ohlong;
pedicel smooth ; operculum large, rostrate or convex-conical.
148. H. rep tile , Michx. Plants drooping, in wide loose
tufts, pale or dirty green ; stems branching, subpinnate or
pinnately ramulose ; branchlets erect, incurved : leaves crowded,
lanceolate-acuminate from an oblong base, sharply serrate above,
concave, flat or recurved on the borders ; costa double, short,
dirty yellow; parapiiyllia few and very small, lanceolate or
palmate ; inner perichætial leaves long-acnminate, sulcate, bicostate,
serrate at the apex : capsule suberect or slightly cernuous,
cylindrical, ochraceous, curved above when dry ; operculum
large, yellow, narrowly rostrate from a highly convex-base;
teeth subulate-acuminate, orange at base ; segments cleft between
the articulations; cilia shorter than the segments;
annulus Large, compound. — FL Bor.-Amer. ii. 315; Bryol. Eur.
t. 587. Leshea pallescens, Hedw. Spec. Muse. 219, t. 55, f. 1-6.
H. pallescens, Beauv. Prodr. 67. Stereodon pallescens, Lindb.
FL Crypt. Asiæ Bor.-Orient. in Act. Soc. Sci. Fenn. x. 254.
Var. p ro tu b e r a n s . Plants smaller; leaves narrower, longer
acuminate, serrate all around : annulus narrow, simple. — Lindb.
1. c., as Stereodon. JI. protuberans, Brid. Bryol. Univ. ii. 612.
JJ. pallescens, Bruch & Schimp. Bryol. Eur. t. 586 ; Aust. Muse.
Appal, n. 414.
H a b . Bark and trunks of trees, either decayed or living, in subalpine
regions ; very common and variable, but rare in the plains except north-
ward.
149. H. fe rtile , Sendt. Tufts soft, compressed, yellowish
or pale green ; stems densely pinnate-ramulose, creeping : leaves
long, ovate at base, subulate-acuminate, imbricate, secund,
subeirciimately hooked when dry ; borders reflexed toward the
base, minutely serrulate at the apex ; costa double, yellow and
very obscure, or none ; perichætium long, squarrulose below,
the inner leaves long, erect, gradually acuminate, narrowly
costate: capsule long-pedicellate, incurved-cernuous, oval or
oblong, turgid, soft, darker colored underneath, scarcely narrowed
under the orifice when dry ; operculum large, highly convex,
mamillate and apiculate ; teeth large, ferruginous below ;
segments nearly entire; cilia two or three, perfect, not appen-
dicuLate; annulus large, compound.-—Regensb. Denkschr. iii.
147'; Bryol. Eur. t. 591.
H a b . Prostrate trunks, moist rocks, etc., in woods on hills and mountains;
not common.
150. H. h am u lo sum , Bruch & Schimp. Densely cespitóse,
yellow or pale reddish-brown ; stems slender, fragile, regularly
pinnate-ramulose : leaves hamulose-secund, ovate at base, gradually
narrowly lanceolate-.acuminate, slightly denticulate at the
apex ; costa double, obsolete or none ; areolation narrowly
hexagonal-vermicular, with a single row of slightly enlarged
cells at the angles ; inner perichætial leaves ecostate : capsule
incurved-cernuous, nearly horizontal, oval or oblong-cylindrical ;
operculum higlily convex, long-apiculate ; peristome as in the
last, luit more delicate ; annulus double. — Bryol. Eur. t. 590.
Stereodon liamulosus, Lindb. Muse. Soand. 38.
H a b . Rocky Mountains (Drummond).
151. H. d ep re ssu lum , Mnell. Differs from the last in its
shining yellow color, the leaves more distant, imbricate-secund
or homomallous, ovate-lanceolate, narrowly-acuniinate, subserrulate
at the apex, obsoletely bicostate, the cells elliptical, less
compact, the ,alar enlarged-quadrate and pellucid, the capsule
smaller, turgid-oval, cernuous, the lid shorter, conical-acute,
not rostrate. — Regensb. Flora, Iviii. 91 (1875). IJ. hámulo