West Inverness, S. M. Macvicar. South of Ireland, Miss
Iluichins, Dr. Taylor, Dr. Spruce, PF. Wilson, Dr. Carrington, &c.
Found on the Continent (France).
O bs.—-The most curious character about this plant is the
inner upper enclosed horseshoe-shaped lobe which Dr. Gottsche
was the first to observe, and who seemed to think it had some
function which we do not understand, for in an allied Lejeunea
from the Straits of Magellan, the inner structure of which was
very similar to our species, he found in the pouch-like lobe the
chitinous remains of many small animals which had been unable
to find their way out of this trap-like arrangement.
A closer investigation of this species will reward the student
with particulars which are hardly to be expected in a work of
mere descriptive botany.
As will be seen from the description and drawings, it is a
species which cannot be confounded with any other British one.
D escription op P late XX. — Fig. 1. Plants natural size.
2. Plant X 31 (Borrowdale, W. H. P.). 3-7. Leaves x 31 (ditto).
8. Leaf x 31 (Cherbourg, France, Corbière). 9. Basal lobe of
leaf x 64 (ditto). 10. Upper lobe of leaf x 64 (ditto). 11.
Portion of leaf x 290 (Borrowdale, W. H. P.). 12-14. Stipules
X 64 (ditto). 15, 16. Bracts x 31 (Cherbourg, Corbière). 17.
Bract x 31 (Borrowdale, W. H. P.). 18, 19. Perianths x 31
(Cherbourg, Corbière). 20. Apex of perianth, showing mouth
x 31 (ditto).
Tribe II. JÜNGEEMANIEÆ.
Subtribe I. R A D U L EÆ .
Genus 4. R A D U L A , Dum.
CoMdoUeoe, sp. Eaddi Jung. Etr, in Mem. Moden. xviii. p. 22 (1820).
Martinellii, Gr. ik B. Nat. A rr. Br. PL i. p. 690 (1821).
Radulæ,sp. Dum. Comm. p. 112 (1822).
Radula, sect. Radvlotypus, Dum. Syll. Jung. p. 38 (1881).
Radula, Dum. Recueil, p. 14 (1885); Nees, Nat. Eu r. Leb. I l l , p. 145 (1838).
Stems laxly pinnate or dichotomous ; branches lateral, arising
from the outer base of the leaves. Leaves incubous, complicate,
bilobed, postical lobe smaller than the antioal, inflexed, producing
rootlets. Stipules absent. ¥ flowers polygonous, fruit terminal on
short branches or at the base of the fork. Perianth campanulate,
compressed or suhterete, truncate, mouth dilated. Bracts entire^
1-pair, somewhat similar to the leaves, deeply bilobed. Calyptra
pyriform, persistent, free, opening below the apex. Pedicel stout,
composed of 6 to 8 concentric layers of alternate cells. Capsule
oval-oylindricai, dividing to the base into 4 valves. Elaters
numerous, long, slender, attenuate at both ends, bispiral, deciduous.
Spores large, globose. Androecia spicate ; perigonia
bracts 3-15 pairs, small ; antheridia 1 or 2 (rarely 3) in the ventricose
base of the bracts.
1. Badula voluta, Taylor.
Radula valuta, Tayl. MS. G.L.N. Syn. Hep. (1844).
Dioicous, shallowly cæspitose, medium size, pale yellow to
yellowish-brown. Stems procumbent, pinnately branched. Leaves
laxly imbricated, incubous, divergent to patent-divergent, unequally
bilobed, antical lobe broader than high, subrotund, obtuse,
quite entire, slightly undulate, crossing the stem, deourrent at its
postical base, postical lobe about one-third its size, broader than
high, subrotund-cordate, plane, undulate or with margin slightly
recurved, crossing the stem, aurioulate at the base ; texture somewhat
flaccid ; cells small, 4-, 5-, or G-angled, walls moderately
thick, without trigones. Androecia on short lateral catkin-like
branches, perigonial bracts 3, 4 pairs, closely imbricate, erect,
turgid, bilobed, lobes oval, postical rather shorter.
Female plant not known.
D imensions. — Stems 1 to inches long with leaves 2 ‘ to
3- mm. wide, diameter '2 mm. to ’3 mm.; leaves, antioal lobe
1- 6mm. X 1-9 mm., postical lobe '9 ram. x 1- mm., antical 1'5 mm.
X 1-5 mm., postical '5 mm. x -6 mm., antioal I 'l mm. x 1'2 mm.,
postical -5 mm. x '7 mm. ; cells '02 mm. x '02 mm., -02 mm. x
•025 mm.; male catkin 3' mm. xU5 mm., 2'5 mm. x U25
mm. ; perigonial bracts, antioal lobe 1'2 mm. x '6 mm., postical