MUSCI AND НЕРАТІСЖ RECORDED FROM JAPAN. 197 
* Challenger’ Exp. 
Caulis cum foliis expansis 3mm. latus. Folia olivaceo-viridia, e cellulis parvis rotun- 
datis, plerumque inanibus, areolata, fere 2 mm. longa, 1 mm. lata. Perianthium 2 mm. 
longum, apice supra folia involucralia parum exserto. 
This differs from the preceding in the more ovate rotund form of the leaves, which are 
so disposed on the dorsal side that the stem is not visible between them, and the radicles 
so abundant in that species are in the present inconspicuous. 
18. PLECTOCOLEA VIRGATA, sp. п. Caulis a rhizomate repente assurgens erectus. Folia 
inter se remotiuscula rotundata patulo-expansa convexave, involucralia duo inferne 
cum perianthio ovato triplicato, ore parvo denticulato, demum laciniato, usque ad 
tertiam partem ejus longitudinis coadunata. 
< Challenger’ Exp. 
Caules satis crassi, pallidi, cum foliis expansis 1:50 mm. lati, radicellis pallidis purpu- 
reisque paucis. Folia 1 mm. breviora, e cellulis rotundis hexagonisque inanibus, parie- 
tibus angustis areolata, pallida. Perianthium 1:50 mm. longum, basi purpureo tinctum. 
Much less in all its parts than P. infusca, and with the foliage so arranged that the 
stem is everywhere visible. Its habit appears different from the fertile stems being 
erect, accompanied by others arcuate and sterile. 
14. P. Segoro, Mitt.—Jungermannia Sieboldii, Sande-Lacoste in Ann. Mus. Bot. 
Lugd. Bat. i. 288, t. 8 (1864). 
Hakone Pass, Bisset. 
This differs from both the preceding species in having a conspicuous stipule; it is 
described and figured with the involucral leaves notched; this is not observable in our 
specimens; but the apices of the involucral leaves are so flexuose-sinuate as to produce 
the appearance of their being bilobate. 
15. P. вогүвні2А, Mitt.—Jungermannia polyrhiza, Hook. 
Recorded by Sande-Lacoste in Miquel; and a barren specimen collected by Maingay 
may belong to it. 
When Solenostoma and Plectocolea were used in the ‘ Journal of the Linnean Society’ 
(Botany), viii. p. 156, neither Gray’s nor Dumortier’s genera had been resuscitated, nor 
had the distinctions between these two different groups of species been sufficiently consi- 
dered. Solenostoma was intended to include all those which correspond in perianth with 
the Jungermannia spherocarpa and other similar species in which the mouth is 
contracted into a tubular orifice similar to that of the Frullanie and .Lejeunie, and 
Which only is rendered dentate by the bursting through of the capsule at its egress. Іп 
Plectocolea the apex of the perianth is not contracted into a tube, but is more or less 
evidently dentate, not different from that usually ascribed to Jangermansia. АП the 
Japanese species are so evidently congenerie with the original species (P. radicellosa) 
that they have been here kept together, and their position in the group to which they 
belong, when seen from a point of view different from that commonly accepted, сап be 
best shown by arranging some of the best known species in a descending series, thus :— 
