194 MR. W. MITTEN ON THE SPECIES OF 
to P. asplenioides; but the perianth shows it to be different; instead of a truncate 
mouth its mouth is oblique, and more deeply cleft on the ventral side. 
9. PLAGIOCHILA TRAPEZOIDEA, Lindenb. Sp. Hep. 112, t. 22, and 
3. P. ВЕЕРНАВОРНОКА, Lindenb. Sp. Hep. 102, t. 21, are enumerated in Miquel's 
‘Prolusio’? by Sande-Lacoste. The first of these in foliage is near the preceding 
species, but has a perianth nearly as in P. asplenioides ; the second has its leaves 
with ciliiform teeth. 
4. P. FURCIFOLIA, sp. n. Caulis gracilis dichotomus viridis. Folia patentia ovato- 
oblonga, sinu acuto plus minus profundo, laciniis lanceolatis acutis furcata, margine 
dorsali recta recurva, ventrali uni- bidentato, e cellulis erossiusculis rotundis areolata, 
mollia, fragillima. 
On dead bark, * Challenger ” Exp. 
Caulis 2 em. altus, cum foliis completis З mm. latus. Folia sordide viridia, fere 
omnia ubique cruribus diffractis incompleta. 
Not unlike small specimens of Р. punctata, Tayl., when the apices of the leaves are 
all broken off, as is generally the case, so that an entire leaf is found with difficulty, the 
two crura being snapped off at their bases. 
5. P. тАРОХТСА, Sande-Lacoste in Ann. Mus. Bot. Lugd. Bat. i. 290 (1864). 
* Challenger’ Exp. 
Compared by the author to P. spinulosa, from which there can be little doubt the 
‘Challenger’ specimens are correctly referred. No perianths have been seen; but the 
whole appearance is so similar to that of Р. orientalis, Tayl., that it may prove identical. 
Probably no species of the great genus Plagiochila has fared worse in the hands of 
describers and delineators than the British P. spinulosa. Dillenius described it, * Hist. 
Muse.’ 489, and figures it t. 70. f. 15, with unusually branched stems, which he collected 
on Snowdon. То this Dickson, fasc. ii. 14, affixed the name Jungermannia spinulosa : 
« frondibus erectis ramosis, foliis obovatis dentato-spinosis. Hab. in Alpibus Scoticis,” is 
all he says about it. In Hooker's ‘ Brit. Jung.’ the figure of the stem is life-like; and 
the ala on the perianth, which is imperfect, is obvious, although not mentioned in the 
description of figs. 5 and 6. The leaves are described as they appear when looked at 
in situ, obovate; when, however, they are removed from the stem their true form is 
ovate-deltoid : the perianths described as lateral and axillary are found in that position, 
left so by innovations; at first they are terminal. Lindenberg (Sp. Hep. 6, t. 1) follows 
Hooker in saying the leaves are obovate, and he did not see the ala. In Lindenb. & 
Nees’ Synopsis Hepat. p. 25, the leaves are “ obovato-cuneiformibus semicordatisque." 
The perianth, when more fully grown, is for half its length exserted above the invo- 
lucral leaves, obconic, the mouth with rounded lips, the ala dentate іп its upper part, 
reaching from the mouth to the base. Male plant and capsules alike unknown. 
From this species Taylor separated his P. punctata, on account of its denser areolation ; 
and the leaves, described in the Synops. Hepat. 626 as *' obovato-cuneatis subrotundisve, ” 
