at the basal excavated angles. Capsule oblong-cylindrical,
erect-eernuous, on a smdoth pedicel. Operculum shortly convex-
conical.
133. H. ad u n cum , Hedw. Dioecious : stem-leaves falcate-
secund, broadly ovate or lanceolate, gradually long-acuminate,
flexuous or half-twisted at tiie apex, with a thin comjiressed
costa two-thirds of the length of the leaf; those upon the
branclilets smaller, falcate, rarely spreading, soft and thin;
basilar areolation hexagonal-rectangular, larger, inflated, pelliù
oid at tlie decnrrent angles, narrower in the middle, very long,
narrow and rectangular or rhomhoidal-hexangular at the apex ;
hasilar perichætial leaves very broadly ovate, gradually larger
above, ovate and oblong-lanceolate, the inner long-acuminate,
narrowly costate and sulcate, all erect, thin, pale ; capsule cy!
lindrieal or incurved-oblong, arcuate and sulcate when dry;
operculum convex, short-apiculate; teeth brown; segments
yellow, entire or cleft between the articulations ; cilia two or
three, subappeiidiculate; annulus compound, large. — Muse.
Frond, iv. 62, t. 24; Schimp. Bryol. Eur. Suppl. Iljpnum, t. 1.
Var. in te rm ed ium . Stems long, irregularly pimiate-ramu-
lose: leaves abruptly short-acuminate from an ovate base or
long-lanceolate, subsecund; lower branch-leaves ovate, short-
acuminate, ecostate, the middle lanceolate, subfalcate, short-
costate, the upper long-laiiceolate, narrowly acuminate.—
Schimp. 1. c., t. 1, B 1-8.
Vai. KneiflQi, Schimp. 1. c. Stems long, flexuous, soft,
prostrate or ascending, more divided ; branches simple or mi-
eqnally ramnlose: leaves narrowly lanceolate, costate to the
middle; basilar areolation narrower, angular, very large and
hexagonal at the angles; lower perichætial leaves spreading
iroin the middle, the upper deejily Bxûoate. — Amblystegium
Kneiffii, Bruch & Schimp. Bryol. Eur. t. 573. Stereodon
Kneiffii, Mitt.
Vai. p o ly c a rp um , Bruch & Schimp. Stems curved downward,
sleu'der, more branched and ramulose : leaves loose, open,
subfalcate, those of the apex falcate-secund, soft, green, broadly
ovate or oblong, narrowed at base, narrowly lanceolate; areolation
as m the var. Kneiffii: abundantly fruiting. — Bryol.
Eur. t. 605, y. H. pohjcarpon, Bland. Æ Kneiffii, Schimp.
Coroll. 135.
Var. g ra c ile sc en s, Bmch & Schimp. Tufts soft, yellowisli ;
stems slender, erect, sparingly branching, pinnately ramulose,
the upper branchlets longer: leaves smaller, open, falcate or
reflexed from the middle or undulate flexuous at the apex,
lanceolate-acuminate from an enlarged cordate base, costate to
above the middle ; basilar areolation loose, rectangular-hexagonal,
that of the apex long and flexuous-linear ; leaves of the branchlets
narrower, lanceolate-acuminate, uncinate. — Bryol. Eur.
t. 604, fig. 3, 22, 23, and t. 605, ¡S.
Var. ten u e, Bruch & Scliimp. Stem prostrate or ascending,
very slender, pinnately or irregularly ramulose : leaves small,
upon the stems open-secund aud ovate-lanoeolate, on tho
branches very narrow and falcate or flexuous, the perichætia
often aggregated ; like the last, but more slender and prostrate.
— Bryol. Eur. t. 605, S.
Var. h am a tum . Plants very large and regularly pinnately
ramulose ; branchlets spreading, rigid, incurved hamate
at the ajiex : young leaves yellowish green, shining, the old
brown or blackish, all solid, long-lanceolate, acuminate, auriou-
late at the excavated angles ; basal cells oval-rectangular, twice
longer than broad, those of the auricles quadrate, the middle
longer and narrowly hexagonal-rectangular, the apical very
narrow, long, linear-hexagonal, diaphanous; costa stout, solid,
rather broader than thick, reaching nearly to the apex, yellowish
brown : flowers and fruit unknown. — II. aduncum, var. hamatum
and var. giganteum, Bruch & Schimp. Bryol. Eur. t. 606.
H. hamifolium, Schimp. Syn. ed. 2, 732.
H a e . Swampy ground, bogs and ditclies; very variable and common,
but rarely fruiting. Var. gracilescens in limestone springs, Pennsylvania;
var. Kneiffii, with loose leaves (var. laxum, Milde), near Closter,
New Jersey (Austin); and var. hamatum, in peat bogs and on the borders
of lakes in Minnesota, and in swamps near Milwaukee, Wisconsin
(Lesquereux).
134. H. S en d tn e ri, Schimp. Dioecious : tufts deep and
wide, dirty red or bright green at the surface, fuscous or black
within ; plants long, simple, flexuous, pinnately ramulose ;
branchlets involute at the apex : leaves crowded, falcate-secund,
broadly ovate or oblong-lanoeolate, aouminate, hooked, recurved
from the middle, very concave, somewhat glossy, slightly striate
when dry, and slightly decui-rent and excavate at the angles ;
basilar cells long-rectangular, narrower toward the borders.