11. L e jeu n ea B o ss e ttia n a , Mussai.
Massalongo, Nuovo Giorn. Bot. Ita l. voi. xxi. p. 487
(1880).
Dioicous, intricately cæspitose, minute, yellowish-green.
Stems subdichotomous or subpinnate, more or less radiculose,
rootlets few, fasciculate, pale. Leaves imbricate, patent, 50°-60°,
bilobed, antical lobe somewhat convex, ovate, apices more or less
attenuate-acuminate (rarely only acute), usually incurved, upper
surface echinate, postical lobe about to ^ the size of the antioal,
subquadrate to roundish-quadrate, tumid at the keel, upper
portion plane, margin not incurved, unequally dentate-spinulose,
exterior surface echinate like the antical lobe, texture opaque :
cells very minute, 4-, 5-, and 6-sided, walls distinct, no trigones
or thickened angles ; papillæ conical, one to each cell. Stipules
absent. Stylus also wanting. Female flowers on short branches,
subtended by an innovation. Bracts similar to the leaves, only
larger, postical lobe with margin more finely dentate-spinulose.
Bracteole wanting. Perianth projecting more than half beyond
the bracts, oval to pyriform, upper portion obtusely 5-angled,
epidermis muricate. Androecia unknown.
D imensions. — Stems about J of an inch long, '05 mm.
diameter, with leaves '85 mm.-l' mm. wide; leaves, antical lobe
•45 mm. x -25 mm., postical ^225 mm. x ^15 mm., antioal -45 ram.
X ^275 mm., postical ^225 mm. x ^15 mm.; cells •0125 mm.;
papillæ -0125 mm. long x •Ol mm. wide at the base ; bract, antical
lobe -5 mm. X -25 mm., postical -25 mm. x -15 mm.; perianth
•6 mm. X ^45 mm., ^55 mm. x ^4 mm.
O b s .—Differs from Lejeunea calcarea, Lib., with w'hioh it has
been confounded hy British botanists in its dioicous inflorescence,
more opaque texture, slightly larger size, leaves a little more
spreading, echinate postical lobe, with margin more dentate-
spinulose, and not incurved, as in L. calcarea (the margin of which
cannot be seen without dissection), and by the entire absence of
the styliform appendage, usually found between the stem and the
leaf of L. calcarea, Tbe above mentioned characters show this
plant to be a distinct species, and was discriminated by the Italian
botanist, Prof. Massalongo, from specimens collected in Italy by
Dr. Rossetti.
Original specimens from Dr. Taylor of Lej. echinata comprise
both this species and Lej. calcarea, but as Prof. Massalongo was
the first to recognise its distinctness, his name justly deserves to
be preserved.
From other British Lejeuneoe it is at once separated by its
echinate leaves.
H ab.'—On limestone rooks, amongst mosses, and often intermingled
with L. calcarea. Lib. Rare.
8. Millers Dale, Winnats, Ravensdale, Derbyshire, G. A. Soil.
10. Limestone Cave, Gordale, Yorks, Dr. Carrington. I. Near
Dublin, 1880, Dr. Taylor. Muoross Desmesne, Killarney, Dr.
Carrington, 1861.
Found on the Continent (Italy, Dr. Bossetti).
D escription op P late XVII. — Fig. 1. Plants natural size.
2. Stem, antical view x 24. S. Portion of stem, postical view x 64.
4-7. Leaves x 64. 8. Leaf x 85. 9. Portion of leaf x 290.
10. Papillæ X 290. 11. Bract x 64. 12. Periantli x 31. 13.
Cross-section of perianth x 31. 14. Apex of perianth x 31
(Winnats, Derbyshire, G. A. Holt).
12. L e jeu nea m in u tis s im a [Sm.).
Jmgermania minutissima, Smith, Bng. Bot. t. 1G38 (1806), Hook. Brit. Jung,
t. 52 (1816).
Jungermania inconspicua, Raddi in Act soc. Modena (1818).
Lejeunea Taylori, Spruce, in Trans. Bot. Soc. Edinb. vol. iii. p. 12 (1849).
Lejeunsa inconspisua, de Not. in G. and R. Hep. eur. n. 45, Dum. Hep. Eu r.
p. 18 (1874).
Lejeunea minutissima (Sm.), Spruce Journ. of Bot. p. 86 (1881).
Monoicous, closely but shallowy or loosely cæspitose, minute,
pale green to whitish. Stems filiform, geniculate, flexuose,
creeping, irregularly branched. Leaves hifarious, alternate, distant
or approximate, erecto-patent to erect, subrotund, almost all the
length complicate, very concave or turgid, postical lobe very little