_ REVUE BRYOLOGIQUE 
lopment beyond enlarging slightly in size, and might be described 
_ almost as scales rather than leaves. 
The creeping shoots in these species of Mnium frequently 
_ become closely intérwoven with radicular tomentum, quite cover- 
_ ing and hiding the accessory leaves, which however in such 
_ cases may be detected on carefully removing the radicles. 
_ These accessory leaves are to be found in several Indian spe- 
cies of Mnium and Ofthomnion ; in O. trichomitrium they are quite 
as highly developed as in O. crispum ; and I have observd them in 
0. Loheri Broth. (where they occur also on the erect S shoots), in 
_ M. javense Fleisch., and M. dilatatum Mitt. In all these they are 
_ triangular or lanceolate-acuminate ; they appear to vary from 
acute to finely acuminate, and: also in the degree of nerving; but 
_ for the most part I have not been able to study sufficient material 
to determine whether these variations are in any way constant 
_for the several species. In 0. crispum and ©. trichomitrium at 
any rate, they are when properly developed finely acuminate 
The Genus ORTHomNIoN Wils. 
In the Supplement to his monumental work on the mosses in 
. Engler and Prantl's Pflanzenfamilien, Brotherus has revived the 
_genus Orthomnion [p.1207 « Orthomnium Wils. in Kew Journ. 
_ Bot. IX, p.368 (1857) »]. In the course ofexamining various species 
of Mnium for the accessory leaves I had occasion to study à num- 
ber of the specimens in the Kew and British Museum Herbaria on 
_ which several of the species are founded, and I think it may be of 
use to refer to them here, the more especially as a good deal of 
confusion exists as to the determinations and the relationships of 
these plants. 
| The original spelling is Orthomnion, and the name should pro- 
_ bably be cited as « Orthomnion Wils. ex Mitt. in Kew Journ. 
Bot. IX, 368 (4857) emend. Broth. » It is based upon two species, 
of which the type is 0. crispum, founded upon four specimens of 
= Herb. Ind. Or. Hook. fil. et Thomson, of which the type specimen _. 
is n° 658 (4) the other numbers being 657, 677, 678. 
oil): Mitten, Musci Ind. Or. p. 142, omits this number altogether, 
_possibly to avoid confusion, since both O. crispum and O.'‘trichomi- 
locality ; but ne 658 stands clearly as the type of O. crispum in the 
original publication, a matter of some little importance, since n° 657, : 
_ the first cited by Mitten in the later work, presents some differences 
_ from 658. He also treats Orthomnion there as a subgeneric division 
_ only. - 
trium were issued under the same number (658), and from the same 
