GENERAL NOTES ON 



483 



carries away with it, the apex of the columella. In that examined, the 

 part where it separated resembled a membranous cup, terminating the 

 inner membrane. 



Fontinalis capillacea of N. America e siccis. — This of which I have 

 only examined one imperfect peristome is obviously allied to Neckera, 

 from which it differs so far as its peristome is concerned, in the ciliae 

 of the inner one being mutually connected by transverse bars, arising 

 I think from the articulation of the ciliae. These are binarily composed, 

 and appear to have small teeth interposed. The outer teeth are likewise 

 binarily composed, occasionally split along the central line, they are 

 remarkable for being carinate, which though a common character in the 

 inner peristome, appears to be very rare in the outer. 



Tortilla rauralis. — The teeth are connected by a membrane of con- 

 siderable size, opaque, and imperforate ; the teeth are mutually connected 

 towards the base, but to a short extent : the cohesion hower extends in 

 some cases between pairs to a considerable height. The teeth are opa- 

 que ; obsoletely articulate transversely, and scabrellous. They occasional- 

 ly appear as if binarily composed, but this seems to be owing to the deve- 

 lopement of the peculiar tissue, to the existence of which the trabecule 

 of other mosses is attributable. 



Tortula subulatd. — Syntrichia differs certainly in degree from Tor- 

 tula, but so does Buxbaumia from Diphyscium. Yet this latter is 

 adopted by Hooker, but not Syntrichia. In addition the teeth of Syn- 

 trichia are binarily composed, an important difference. 



Pterogonium hiriiUum. — Teeth arise from inner membrane which is 

 excessively fine. They are binarily composed, and opaque, especially 

 below the middle. They are distinctly trabeculate. 



This genus I should be inclined to place next those Weissiae with bi- 

 nary teeth, owing to the great similarity of these organs, and the thecain 

 general. It will be at once distinguished by its lateral fructification. It 

 comes near Leucodon, but as I have no opportunity of examining good 

 specimens of this, I am unable to state whether it agrees with it in the 

 structure of the teeth of the peristome. 



The leaves in Drummond's specimens are scarcely fimbriolate, except the 

 perichaetial ones. Bridel says folia prossus enervia ; in the above speci- 

 mens, they are mediatenus 1 venia. 



Didymodon purpureus e siccis. — Perhaps Bridels Ceratodon is a toler- 

 ably good genus. 



The teeth of the peristome arise very evidently from the inner theca, 



