Obs-—One of the most distinct species of this genus, smaller
than most of them, but more robust than A. curta; its colour and
the acute serrated leaf-lobes distinguish it from them all.
The late Prof. Lindberg, in his “ Muse. Soand.” (1879), stated
that the Jung, umbrosa of Schrader (1797) was without doubt the
same as the Jung, convexa of Scopoli (1772), so along with others
I adopted the older name. Prof. Howe, in his admirable
“ Hepaticæ and Anthocerotes of California,” says, “ it is very
probable that it may be so, yet, as Scopoli describes the perianth
as oval and dentate at the apex, while those of 8. umbrosa are
oblong and entire at the mouth, we prefer to retain for this species
a name concerning the correct application of which we can have
no doubt,” so I gladfy follow my friend Prof Howe in retaining
this very characteristic one.
D escription of P late XCVL—Pig. 1. Plants natural size.
2. Stem X 31 (15, Austin, Amer. Hep.). 3-7. Leaves x 24
(20, C. & P. Hep. Brit.). 8. Portion of leaf x 290 (Woodhead,
Whitehead & W. H. P.). 9. Bract x 31 (Husn., Hep. Gall,
n. 66). 10. Perianth x 24 (Goathland, W. H. P.). 11. Pistillidia
X 85 (Husn. Hep. Gall. n. 66). 10. Perigonial bract
X 31 (Woodhead, Whitehead & W. H. P.). 13. Antheridium
X 85 (ditto).
Genus 21. DIPLOPHYLLUM, Bum.
lia, Mich. Nov. PI. Gen. p. 8, tab. 5, fig. 9 (1729); Linn. PI. Suec.
1st ed. p. 335(1745); Hook. Brit. Ju n g . (1816).
Diplophyllum, Dum. Recueil, 1, p. 15 (1835).
Scapania, M itt, in Hook. Fl. Tasm. 2, p. 233 (1858).
Branches axillary, proceeding from the inner base of the leaves.
Leaves conduplicate, unequally bilobed, the antical lobe smallest.
Stipules absent. Involucral bracts small, similar to the leaves.
Bracteole absent. Perianth free, sessile, erect, terete, subcylin-
drical, pluriplioate, mouth denticulate. Capsule coriaceous,
4-valved.
1. Diplophyllum albicans (Z.), Dum.
Ilepaticoides albescens fo liis p i n n a t i s , Bot. Pa r., p. 100, t. 19, f. 5 (1723).
Jungermania repens fo liis cordatis caxinatis, Mich. Nov. pi. gen. p. 8, t. 15, f. 9
(1729).
lAchenastrum auricidatum, p in n u lis cmgustis planis recurvis. Dill. Hist. Muse.,
p. 492, t. 71, f. 20 (1741).
.Jungermania albicans, Linn. Sp. pi. p. 1599 (1753), Hook. Brit. Ju n g . t. 25
(1816).
Diplophyllum albicans, Dum. Eecueil, p. 16 (1835).
Dioicous ; growing in loose or matted tufts, medium size, of a
green, greenish-brown, or often reddish-brown colour, as if singed.
Stems simple or subramose, ascending; radiculose, rootlets short,
close, dirty-white, ascending to apex of stem. Leaves bifarious,
contiguous, conduplicate, unequally divided to about the vittate,
margin entire or subdenticulate, often erose ; antical lobe half the
size of the postical, incumbent, 30°-40°, lanceolate, acute or
rounded ; postical lobe slightly ascending 60°-80°, lanceolate or
ovate-lanceolate, acute or rounded, cells snbquadrate, small or
rather minute, cell-walls thick, no trigones. Bracts similar to
leaves, only larger. Perianth terminal, obovate, 5-plicate at the
upper portion, mouth contracted, laoiniate-dentate, hyaline.
Perigonial bracts in the middle or at the end of the stem,
usually 4 to G pairs, often a little smaller, more erect; antheridia
1 or 2 in the swollen base of the antioal lobe, oval, very large.
Fruits March, April.
D imensions.—Stems from inch to 2 inches long, diam. '2 mm.
to '5 mni.; leaves, antioal lobe 1' mm. x '5 mm., postical 1'75 mra.
X -75 mm., antioal 'G mm. x ’25 mm., postical '9 mm. x '4 mm, ;
cells -0175 mm., '02 mm. ; bract, antical lobe 1'25 mm. x '5 mm.,
postical 1'7 mm. x '75 mm. ; perianth 2’ mm. x 1' mm. ; perigonial
bract, antical lobe '75 mm. x '5 mm. ; postical lobe 1'24 min.
X '5 mm.; antheridia ’3 mm. x '2 mm.
H ab.—Grows everywhere, on rocks and banks in shady woods
or by roadsides, on the ground or walls; very common, from the
lowlands to considerable heights, 1 to 18. I. C.
Found on the Continent, Madeira, North and South America,