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Maie infl. gemmiform, a x illa r ; the b ra c ts ovate, acuminate, nerve
obsolete.
H a e .— Fallow fields and wet heaths. Not uncommon. Fr._5_6.
N. Wales (Bowman). Kinnalrd (Gardiner 1844) ! ! Welburn (Spruce). Near Shotover
(Boswell) ! Hale, Ashley and Helsby (Hunt) ! ! Newtimber and Pylcomb Downs
(Davies i86z) ! ! Haversham head, Westmoreland (Barnes 1871) I Mere Cheshire
(Wilson 1844) ! ] / / .
Great confusion exists in the early authors between this species and the
last, and AnUdium alternif. and after the latter is separated, we still find the
majority of references to PL suhdatum belong to the present plant, due no
doubt to the fact that it is by far the commonest species on the continent,
while PI. suhdatum is much more frequent with us. Hedwig’s beautiful figure
well shows the male infl. and the position of this, with the long perich. bracts
suddenly dilated at base, enable us readily to indentify PI. alternifolium.
3. D I T R I C H U M T i m m .
(Fl, Megapolit. 216 (178S). )
Plan ts cæspitant, dwarf, or tall and slender, living on the ground or
on rocks. Le a v e s lanceolate-subulate, smooth and glossy, the areolation
narrowly re c tangular above, la x and hexagono-rectangular at base.
C a lyp tra narrow, cu cu lla te . Capsu le on a slender stra ight seta, usually
e re c t, oval or subcylindric, annulate ; peristome erect, o f i5 longish
teeth cleft to base into two filiform a r ticu la te papillose legs, fixed on a
short membrane. Spores very small, smooth.— Deriv. Sts two, tpef hair.
Hampe in Regens. bot. zeit. 1867, p. 181, points out that this genus was
founded by Timm on D. fasilhm, and must supersede his own Leptotrichmn
not only by right of priority, but also because the latter was already in use
for a genus of Fungi. About 25 species are known; but L . vaginans of
Scliimper’s Synopsis, 2 ed. 140, and of Sullivant’s Exsicc. is only a variety of
D. tortile, and differs from L. vaginans Sull. leones, (see L in d b e r g Revis,
crit. ic. Fl. Danica, p. 107.)
C l a v i s t o t h e S p e c i e s .
Leaves squarrose. Capsule very narrow, cylindraceous.
Leaves erecto-patent or secund. Capsule ovate or elliptic.
Paroicous. Leaves patent, setaceous.
Dioicous. Leaves subsecund or falcate.
Stems short, straight; leaves lanceolate-subulate.
Capsule cylindric, lid shortly rostellate.
Capsule elliptic, lid conic, obtuse.
Stems tall, slender, flexuose; leaves flexuose, falcate.
tcmiifolmm.
subulaUm.
tortile.
homomallum.
flexicaule.
Sect. I . TRICHODON [ScJdmp.]. Plants dwarf, slender ; leaves sheathing
at base, suddenly subulate, flexuoso-squarrose. Capsule narrowly cylindraceous.
I . DITRICHUM TENUIFOLIUM [Schrad.) Lindb.
Dioicous ; stem short ; leaves flexuoso-squarrose, sheathing at base,
subulate. Capsule on a slender pedicel, v ery narrowly cylindraceous,
lid conical. (T. X IV , E.)
SYN.— Trichostomum tenuifoUum S c h r a d . Journ. Bot. ii, P. i, 58,(1799).
Trichostomum cylindricum H e d w . Sp. musc. 107, t. 24, f. 7-13 (i8oi). B r id . Sp, musc. I,
230 (1806), Mant. 83 ( 18 19 ), Bry. univ. i, 4 9 1 (1826). S c h k u h r Deutsch. Kr. Gew!
P. II. 79, t. 35 (1810). S c h w a e g r . Suppl. I, P. i, 142 (1811). W a h l e n b . Fl. lapp. 332
(1812). F u n c k Moost. 25, t. 16 (1821).
Dicranum cylindricum W e b . M o h r Bot. Tasch. 202 (1807). R o e h l . Deutsch. Fl iii
70 ( 18 13 ) .
Didymodon cylindr. W a h l e n b . Fl. suec. ii, 734 (1826). S o m m e r p . Suppl. Fl. lapp 52
(1826). H a r tm a n Skand. Fl. H o o k . Br. Fl. ii, 32 (1833).
Ceratodon cylindr. F u e n r . in Reg. bot. zeit. 1829, P. 2, erg. 31. B r . S c h . Bry. eur. fasc.
29-30, t. 3 (1846). W i ls . Bry. Brit. 85, t. 39 (1855). H a r tm . Skand. Fl. 7 ed. Fl. Dan.
Suppl. t. 114, f. 2. Hobk. Syn. Br. m. 49 (1873).
Ängstroemia cylindr. C. M u e l l . Synops. 1, 441 (1849}.
Trichodou cylindr. Schimp. Coroll. Br. eur. 36 (1856). Synops. 140 (i860), 2 ed. 138 (1876).
B e r k . Handb. Br. m. 275 (1863). M i l d e Bry. Siles. 134. (1869). D e N o t . Epil. Briol.
I ta l. 570 (1869).
Trichodou tenuifoUus L in d b . Eur, Trich. 225 (1864).
Ditrichum tenuifoUum L in d b . Musci Scand 27 (18 7 g ).
Dio icous ; gregarious or in small y ellowish green tu fts ; stem short,
slender, simple or but little divided. L e a v e s pa tent, flexuose, squarrose,
crisped when dry ; the lower small, ovato-subulate, upper lanceolate-
subulate, perich. bra cts from a broad sheathing base, suddenly capillaceo-
subulate, th e nerve broad, forming the whole upper part o f subula, and
denticulate in th e upper h a lf ; cells firm, narrow, elongated. Capsule
on a lon g v ery slender pale reddish seta, leptodermous, v ery narrowly
cylindraceous, slightly incurved in the middle, brown, erect or inclined ;
lid conic, ra the r obtuse, red ; annulus broad, revoluble ; teeth o f per.
pa le red, the legs long, filiform, rough.
Male plant more slender, in distinct tu f t s ; perig. b ra c ts convolute
concave, subulate, antheridia numerous w ith slender paraphyses.
H a e .— Fallow fields and wet sandy ground ; rare. Fr. 5 6.
and Stockton forest, York (Spruce) ! ! Bowdon, Cheshire (Hunt
1868)!! Glen Prosen (Fergusson 1867)!! Ardingly and Tilgate, Sussex (Mitten).
Beltnst (Drummond 1830). Lancashire and Derbyshire (M/ilsoii). Fruit very rare.
This species has been tossed about under various genera, but is clearly
at home in the present one ; it must be carefully discriminated from Dicranella
crispa and Grevillei which have similar leaves.
Sect. 2. EU D IT R ICH UM Lindb. Plants slender, short or elongated.
Leaves divergent, subsecund or falcate, lanceolate-subulate. Capsule oval or
subcylindric.