198 МВ. W. MITTEN ON THE SPECIES OF 
* Perianth free (— Eujungermannia, Spruce). 
CORDIFOLIA (Jungermannia cordifolia, Hook.). 
RIPARIA (Jungermannia riparia, 'Tayl.). 
ARIADNE (Jungermannia Ariadne, Тау!.). 
ғозчомвкохтогокв (Jungermannia fossombronioides, Austin). 
S1EBoLDII (Jungermannia Sieboldii, Sande-Lacoste). 
** Perianth with one or both involucral leaves adherent. 
ТоменунмтамА (Jungermannia Junghuhniana, Nees). 
rorvnuiza (Jungermannia polyrhiza, Hook.). 
HYALINA (Jungermannia— Nardia Eucalyz, Lindb.). 
oBovATA (Jungermannia obovata, Nees). 
vIRGATA, Mitt. 
iNFusca, Mitt. 
RADICELLOSA, Mitt. 
CRENULIFORMIS, Austin. 
*** Perianth with more than one pair of leaves coadunate. 
HasskARLIANA (Alicularia=Nardia Eucalyz, Lindb.). 
SCALARIS (Nardia, S. Е. Gray; Alicularia, Corda). 
COMPRESSA (Jungermannia Nardia, S. Е. Gray = Mesophylla, Dum.). 
In the Jungermannie the greatly preponderating condition of the perianth is to be 
free from the involucral leaves, and it is here assumed to be the normal state, and the 
adhesion of one leaf in P. hyalina and of two in many other species are departures 
leading directly to the condition observable in P. scalaris. In all the species above 
mentioned the form and structure of the perianth or colesule is the same, and little 
different from that ascribed to Jungermannia, its altered appearanee in P. compressa 
and P. scalaris being due to the adhesions of the subtending leaves. 
The species referable to Solenostoma and Plectocolea are all destitute of the incised 
involucral leaves which characterize those included in Jamesoniella and Syzygiella, 
Spruce, and in this particular agree with Liochlena and Mylia. 
LOPHOCOLEA, Dum. 
16. L. compacta, sp. n. (Plate LI. figs. 21-23.) Caulis prostratus, repens. Folia 
explanata rotunda rotundo-ovatave, apice obtusissima, integerrima, retusa vel 
oblique truncata breviterque bidentata, e cellulis rotundatis limitibus obscurioribus 
areolata. Amphigastria basi libera, caule parum latiora, ovato-quadrata, bifida, 
utrinque unidentata. Folia involucralia conformia, amphigastrio parvo. Perian- 
thium oblongum prismaticum, angulo dorsali superne alato, labiis rectangulatis 
dentatis. 
Creeping on bark amongst Stereodon circinalis, Challenger’ Exp. 
Caulis crassiusculus uncia brevior, cum foliis explanatis 2 mm. latus. Folia olivaceo- 
viridia obscura. 
Allied to the Australian L. heterophylloides, but smaller; no truly bidentate leaves 
have been seen, and it is inodorous. 
