486 MR. E. S. SALMON : REVISION 
Piate 24. 
Fig. 10. Part of mature sorus of unilocular sporangia. x 375. 
ll. Large eryptostoma. x 375. 
12. Sorus round large cryptostoma. x 140. 
13. Rhizoids penetrating into host plant. x 140. 
14. Part of same. x 375. 
A Revision of the Geras Symblepharis, Montagne. By EaNEsT 
SrawuEY Saimos. (Communicated * by E. M. Homes, 
F.L.S.) 
[Read 2nd June, 1898.] 
(PLATES 25 & 26.) 
THE genus Symblepharis was established by Montagne in Aun. 
Sci. Nat. sér. IT. viii. p. 252 (1837), for the reception of a 
Mexican moss, which he named S. helicophylla. 
In this species the sixteen teeth of the peristome are more or 
less completely united below iu pairs, and so form eight groups. 
Each group, or pair of teeth, is separated from the next, as 
Montagne remarked, by an interval about equal to the width of 
a simple tooth (Pl. 25. fig. 2). | 
The teeth of S. helicophylla, when wet, are strongly connivent 
into a cone (fig. 1). 
These two peristome characters were considered of generic 
value by Montagne, and from the first—the distinct arrange 
ment of the teeth in pairs—the genus derives its name. 
Mitten, in his work on Indian mosses (1), sank Symblepharis 
in Leptotrichum, Hampe; and in his remarks on Leptotrichum 
Reinwardti, Mitt. (Gyrophyllum Reinwardti, Dozy & Molkenb.), 
said: * Habitus omnino precedentis [Z. himalayanum, Mit 
quocum structura adeo convenit ut nulla methodo natural 
separari potest. Peristomium dentibus equi-distantibus dieranis 
ab eo L. himalayani et specierum aliarum Symblephari gener 
adscriptarum diversum, sed differentia hecce momenti ejusdem 
ut in speciebus Orthotrichi generis censenda est." as 
But although the acceptance of the genus Symblepharts © 
defined by Montagne would lead, as Mitten pointed out, to . 
separation of species closely allied, we find that, if we do away 
