cells -02 mm. x ’025 mm., '025 mm. x '025 mm., '03 mm. x
■02 mm., -04 mm. x '02 mm. ; stipules ’8 mm. x '6 mm., ’4 mm. x
•15 mm.! -4 mm. x -25 mm., -35 ram. x -25 mm., T mm. x A mm. ;
perianth 2' mm. x 1-25 mm.
H ab. On damp shaded rocks or stones, very rare.
1. Eiver side, Fingal Bridge, Devonshire, W. Curnow.
1. South of Ireland, Br. Taylor, Dr. Moore, A. Carroll, &c.
Lough Mangerton, Stewart and Holt.
Found sparingly on the Continent (France), also in North
America. p , -d i
O bs. This is the smallest and most delicate of the British
Porellce, and is nearest related to P. rivularis, which see.
The description of the fertile plant is taken from North
American specimens by Dr. Gottsche, sterile plants only having
been found in Europe.
D escription oe P late XXXIL—Pig. 1. Plant natural size.
2. Portion of stem, antical view x 16 (C. and P. n. 132). 3. Ditto,
postical view x 11 (ditto). 4, 5. Lobules x 24 (Mangerton, Holt
and Stewart). 6. Portion of stem, witli lobules and stipules x 31
(C. and P. n. 132). 7. Lobule x 64 (ditto). 8. Portion of leaf
x 290. 9, 10. Stipules x 24 (Mangerton, Holt and Stewart).
11. Stipule X 31 (ditto). 12. Ditto x 64 (C. and P. n. 132). ^
Genus 6. PLETJROZIA., Duvi.
Jungermania, Weiss, PI. Crypt. Fl. Gott. p. 123 (1770).
Pleurozia, Dum. Eecueil, i. p. 15 (183o).
Fhysiotium, Nees, Nat. Eur. Leb. 3, pp. 6 and 75 (1838).
Involucral bracts two, deeply bilobèd, the upper broad and
convolute, Perianth much exserted, long, cylindrical, mouth
denticulate, decurved and plicate at the apex. Capsule 4-valved,
coriaceous. Elaters hispiral, deciduous. Stipules absent. Leaves
witli postical lobes auriculate, the auricles inflated.
Pleurozia cochleariformis iss), Dum.
Lichmastrum cdpinum p u rpw em n fo liis auriiis oochlmriformihus. Dill. Hist.
muse., p. 479, t. 69, f. 1 (1741).
Mnium Jungermania, Linn. Sp. pi. p. 1579 (175.3).
Jungermania eockleariformis, Weiss, PI. Crypt, p. 123 (1770); Sm. Bngi. Bot.
t. 2500 (1813); Hook. Brit. Jung. t. 68 (1 8L6).
Jungermania purpmrea. Scop. Fl. Cam. 2, p. 347 (1772).
Pleurozia coehlearifmnis, Dum. Syll. Jung. Eu r. p. 38 (1831).
Physiotium cochleariforme, Nees, Nat. Eur. Leb. I l l , p. 79 (1838).
Pleurozia purpurea, Lindb. Muso. Soand. p. 3 (1879).
Dioicous, loosely or closely cæspitose, large, pale to dark
reddish-brown or purple in colour. Stems creeping or ascending,
arcuate, simple or with 1-3 long or short branches, frontally
compressed, 15 cells in diameter, cortical, with second and third
outer layers of cells smaller, reddish-brown, inner whitish, opaque,
walls thick. Leaves incubous, closely imbricate, distichous,
convex, bilobed, antical lobe ovato-rotundate, emarginate to about
a fourth, segments dentate, inflexed, near antical base furnished
with 1—3 teeth, postical lobe about -J- smaller, attached to the
lower portion of the antioal lobe, ovate-parabolic, utriculate, base
contracted, decurrent, on the inner side deeply depressed and
folded longitudinally. At the base of this furrow is a minute
slit with a pendant roundish lip, which is slightly concave ; upon
this is appressed a very delicate lid of somewhat similar shape
but plane, of very delicate cell structure, lianging from the other
side of the slit, both these appendages being suspended witliin
the lobule. Texture of leaf firm, epidermis verruculose, cells
small to smallish, roundish-hexagonal, trigones very large, often
liyaline, lumen deep red or purple, the lip within the lobule is
composed of very delicate cells, tliin walls, no trigones, about
20 X 30, marginal cells subquadrate, still more delicate, about
50 to 60 round. No stipules. Androecia catkin-like, minute,
solitary, produced from the axil of the antical lobe, suhoylindi-i-
cal; perigonial bracts 6-8, closely imbricate, appressed, concave,
ovate or oval, bifid or tridentate; antheridia oval, solitary.