482 



MUSCI. 



of the peristome are certainly simple. The perforation of teeth is by no 

 means of generia value. 



Tayloria splachnoides.— In this genus the teeth are at the base," at 

 least, binarily compound, Hookers representations fig. G. 7 are therefore 

 deficient. From the imperfection of the specimens I have, I cannot say 

 whether the teeth are binarily composed to the summit. The line in- 

 dicating their composition is excessively faint : indeed scarcely discerni- 

 ble with my 1-20. I am likewise incliued to believe that the pairs of teeth 

 arc compound as those of the inner peristome of Bartramia and Funa- 

 ria: if so, this will be a singular case. In the outer peristome, the teeth 

 arise very evidently from the inner capsule. The columella has a re- 

 markably long apiculus. 



The almost universal contraction of the columella is singular ; hence 

 Lyellia is not so remarkable for this property, as for that of extensibility. 



Cinclindotus fontinaloides, e siccis. — The teeth here likewise spring 

 from the inner theca, but the union of this, with the outer towards 

 the mouth of this is very intimate. The teeth are semispirally twisted 

 at first, but they appear subsequently to lose this, and to become 

 straight. They are binarily composed, but the composition does not 

 appear to extend far up, as a 1-20 lens does not demonstrate a longitu- 

 dinal line. 



It has some points in common with Grimmia, but more with Trichos- 

 tomum ! it must likewise be considered as approaching Tortula. The 

 anastomosis that takes place at the base appears to take place chiefly 

 between the pairs of teeth. Suddyah July, 7th. 1S36. 



Diphyscium.— Of this genus I have examined a single theca ; this 

 examination leads me to believe that Diphyscium is scarcely generi- 

 cally distinct. The outer peristome is not at all analogous to the 

 peristome of other mosses, and is a direct continuation of the cellular 

 tissue of the outer theca, and is hence perhaps analogous to an an- 

 nulus. From this continuation the cuticle of the theca is distinct. 

 The inner peristome likewise appears different from almost all others 

 in not originating from the inner theca, it is certainly distint by its 

 structure : which is entirely that of Diphyscium ; still it may be as- 

 sumed to be binarily composed: the narrower lines occupying the 

 bottom of each fold, being the lines indicating composition : the 

 broader and prominent ones indicating the union between the teeth. 

 The greater part of that which is called the outer peristome separated 

 with the operculum. In Diphyscium there is certainly a tendency 

 toward the formation of a similar outer peristome. The operculum 



