7. E a d u la com p lan a ta (Z.), Dum.
.Jungermania complamata, Linn. Sp. Pl. 1509 (1753) ; Hook. Brit. Jang. t. 81
(1816).
Radula complánala, Dum. Comm. p. 112 (1822).
Paroicous, imbrieately, widely, and shallowly cæspitose, largish,
pale yellowish-green colour. Stems creeping, stratiose, subpinnate,
cortical cells about 35, similar in size to inner, only with thicker
walls, cells 8 x 10 in diameter; slightly radiculose, rootlets dirty
white, produced from postical side of postical lobes of leaves.
Leaves imbricate, patent to patent-divergent, 60°, unequally
bilobed, quite entire or erose, antioal lobe roundish, slightly convex,
covering the stem, postical lobe about -J- smaller, quadrate, angle
obtuse or subacute, sometimes arcuate ; cells smallish-medium
size, hexagonai, walls thin, trigones very small, lumen full of
chlorophyll granules. Bracts similar in size to the leaves, antieal
lobe elongato-obovate, postical lobe about half the size, ovate, apex
rotundate. Perianth projecting about half beyond the bracts,
oboonical, complánate, mouth wide, truncate, quite entire. Capsule
dark brown, oval ; spores large, about 3 times the diameter of the
elaters, which are bispiral. Perigonial bracts 3-3 pairs, immediately
below the perianth (or on a lateral branch produced from
below it at the apex of whioli is always an imperfect female flower),
closely imbricate, erect or erecto-patent, tumid, unequally bilobed,
antical lobe oval, postical about half the size ; antheridia single,
globose.
Gemmiparous, gemmæ discoid, on the margins of leaves,
rendering them often irregular and erose.
D im e n s io n s .—Stems 1 to 2 inches long, diameter '15 mm., with
leaves 2'25 mm. to 2'5 mm. wide; leaves, antical lobe 1'3 mm. x
I 'l mm., postical lobe '7 mm. x ’5 mm.; cells '035 mm. x '025
mm. ; innermost and perigonial bracts, antical lobe 1'12 mm. x '82
mm. ; postical 7'5 mm. x 5'5 mm. ; perianth 3' mm. x 1'25 mm. ;
capsule 1-25 mm. x '75 mm. ; spores 'OS mm. ; elaters, '2 mm. x
'01 mm. ; antheridia 2'25 mm' x '2 mm.
H a b.— On the bark of trees. Common. 1 to 17. I.
Found on the Continent and in North America.
O bs.— This, the commonest of our British Badulæ, is distinguished
from all the others by its paroicous inflorescence.
The antheridia are normally situated below the young
perianth, but with its maturing, they disappear and the bracts
assume the form of ordinary leaves ; but a lateral young branch,
proceeding From below the perianth, usually bears 3-5 perigonial
bracts with an immature perianth at its apex.
D escription or P late XXVII.—Pig. 1. Plant natural size.
2. Portion of stem, antioal view x 11 (Barmouth, W. H. P.).
3. Ditto x 16 (ditto). 4. Ditto, postical view x 11 (Dove Dale,
W. H. P.). 5. Portion of stem with perianth x 21 (Jack del.).
6. Portion of leaf x 290 (Dove Dale, W. H. P.). 7. Perianth
with bracts x 11 (ditto). 8. Perigonial bracts x 16 (ditto).
9. Young flower, showing ¥ and <? x 40 (Gottsche del.).
Subtribe I I . POR B LLEÆ.
Genus 5. POR EL LA, Dill.
Poreda, Dill. Hist. muse. p. 469 (1741) ; Lindb. in Act. soc. sc. fenn. p. 329 (1869).
Bellincinia et Antoira, Iladdi Jung. Etr. in Mem. Moden. xviii. p. 18 et 19 (1820).
Cavendishia, Gr. and Benn. Nat. Arr. Bi'it. PI. i. p. 689 (1821).
Madotheca, Dum. Comm. p. 111. (1822).
Dioicous. Stems regularly pinnate and feather-like ; branches
lateral, axillary. Loaves incubous, often subopposite, complioato-
bipartite ; postical lobe much smaller, exterior base often decurrent.
Stipules large, basal angles deourrent with a laciniate and críspate
wing.
Flowers ¥ lateral, nearly sessile. Bracts 2-pairs, bilobed,
dentate or ciliate. Perianth short, ovate, frontally compressed,
trigonous on section, mouth plurilaciniate, at first constricted,
afterwards bilabiate or campanulate. Calyptra globose, carnose,
rupturing below the apex. Pedicel very short, not projecting
beyond the perianth. Capsule globose, pale, membranous, divided
nearly to the base into 4 valves. Elaters small, short, bi-trispiral,
free, attenuate at both ends. Spores rather large, somewhat
angular. Androecia shortly spicate; perigonial bracts exactly