204, H E P A T IC Æ .
Genus 19. A D E L A N TH U S , Mitten.
Jungermania, Hook, in Bng. Bot, t. 2607 (1813).
Radula, Dimi. Syll. Ju n g , p. 43 (1831).
Plagiochila, G.L.N. Syn. Hep. p. 24 (1844).
Adelanthus, Mitt. in Journ. Linn. Soo. p. 204 (1804).
Sphagnoecetis, H artm. Skand. Fl. ed. 10, 2, p. 144 (1871).
Odontoschisma, Lindb. MSS. in Hartm. Skand. Fl, ed. 10, 2, p. 144 (1871).
Plants cæspitose, pale or dark green. Stems firm, caudex
■creeping, simple or slightly branched, radiculose, suberect, apex
often deeurved or suboiroinnate, producing from near the base
postical flagella which are minutely leaved and radiculose. Leaves
suooubous, moderately large, alternate, obliquely rotund or ovate,
decurvo-seound, antioal margin incurved, subentire, postical subplane,
very often spinulose-dentate ; cell rather large to minute,
guttulate, pachydermous, trigones distinct, marginal cells minute,
opaque. Stipules none or very rare and minute. Inflorescence
dioicous, cladogenous, postieal. Bracts Ç tristichous, the innermost
slightly smaller than the leaves, apex bifid or variously
incised. Pistillidia 12-15, Perianth pyriform or fusiform,
turgid, 3-5 angled, mouth denticulate. Calyptra a little smaller,
carnose, below the middle 3-5-stratose, sterile pistillidia surrounding
it. Capsule oval, 4-valved, bistratose. Androecia amentiform ;
antheridia solitary, very rarely two.
A d e la n th u s d e c ip ien s [Hook.), Mitt.
Jungermania decipiens. Hook, in Bng. Bot. t. 2507 (1813) ; Brit. Ju n g t 50
(1810).
Radula decipriens, Dum. Syll. Ju n g . p. 43 (1831).
Plagiochila decipiens, Dum. Eecueil, p. 15 (1835).
■Gymnanthe decipiens. Mitt. Jo u rn . Linn. Soc. 11, p. 160 (1863).
Adelanthus decipiens, Mitt, in Jo u rn . Linn. Soc. p. 264 (1864).
Odontoschisma decipiens, Lindb. MSS. in H artm. Skand. Fl. 11, p. 144 ; Lindb.
Soc. Faun, e t Fl. Fenn. 13, pp. 357-363 (1874).
Dioicous, densely cæspitose, flagelliferous, medium size, dark
ohve green when growing, below and when dry, dark brown in
colour. Caudex prostrate, intrioately branched below, producing
A D E IA N T H U S . 205
erect or ascending fastigate stems, stems blackish, firm, simple,
rarely furcate or subramose, apices decurved ; cortical cells 30-36,
lurid, opaque, 10-12 cells in diameter, inner slightly smaller, subpellucid
; flagella postical, few, only on the lower part of stem,
with very minute, tristichous, distant, subquadrate-rotund, pellucid,
rudimentary leaves, hearing fasciculate rootlets, tender, fragile,
towards the ends of the flagella destitute of leaves, but producing
numerous rootlets. Leaves incubous, lower smaller, subimbricate,
appressed, upper larger, more crowded, deourvo-secund, rarely
disticlious-patulous, obliquely inserted, antical base long and
gradually decurrent, subrhomboid or obliquely orbiculate, entire,
apex rotundate retuse, apioulate or spinose, bi-tri-lobate, antical
margin incurved, postical subplane or slightly concave. Texture
thick, epidermis a little rough ; cells medium to rather large in
size, hexagonal, walls firm, angles thickened or trigones distinct,
marginal cells distinct, thicker, subquadrate. Stipule on stem
none or rudimentary. Inflorescence ? postical, on very short
branches produced from near base of stem, rarely from middle.
Bracts about 9, in threes, tristichous, outermost minute, scale-
like, innermost a little shorter than the leaves, apex more or less
deeply bifid, segments patulous, free or subeonnate at the base,,
subentire ; Ç branches excavate, cavity pyriform. Perianth twice
as long as the stem leaves, projecting far beyond the bracts,
narrowly obovate, pyriform, turgid, above obtusely tri- (rarely
4-, 5-) gonous, mouth at first connivent, afterwards subtrifid, subdenticulate
or ciliolate. Calyptra a little smaller than the
perianth, pyriform, firm texture, composed of 3 layers of cells,
apex afterwards irregularly trifid, at base surrounded by few
(about 12?) sterile pistillidia. Androecia postical, whitish,
slender, julaceous or roundish, concinnate, produced from the
whole length of stem, but chiefly from near the base ; perigonial
bracts 12 pairs or less, closely imbricate, subcymbiform or cuccu-
late, very concave and subsaocate, but scarcely complicate, slightly
unequal, very often entire, rarely bidentulate, areolation very
pellucid; antheridia solitary, shortly stipitate; perigonial bracteoles
everywhere present 2—4 times smaller than the bracts, subrotund