MUSCI. 



485 



Certainly allied the Polytrichoideae, to the peristome of which the outer 

 of this genus is certainly analogous. Is the inner a modification of the 

 Epiphragma, so conspicuous in Polytrichum ? 



Encalyptra vulgaris. — Orthotrichoid in the structure of the calyptra, 

 habit and areolation of the leaves. 



Trichostomum aciculare, Trichostomum lanuginosum, Trichostomum 

 fascicular -e. — These three species agree exactly in the structure of the 

 teeth, which in all have a tendency to cohesion, and often to mutual 

 adhesion. Their formation is irregular, and in their opacity they approach 

 those of Grimmia. Of the figures given of many species by Hooker, I 

 can only say, that a priori speaking, the teeth appear to me to be very 

 singular, at the same time the augmentation is sufficiently great for the 

 demonstration of their real structure. The same is applicable to the 

 drawings of Leucodon, and to Bridels figures of Racomitria and Tri- 

 chostomum. 



Bridel says that T. aciculare has a continuous nerve as well asT. 

 fasciculare, but this is not I think correct, either of one or of the other. 



The genus is remarkable for the universal occurrence of lateral inno- 

 vations, the sporules are semi opaque, and burst in water, 



Delin. e siccis, Drumm. N. America Mosses, Suddyah, July, 1836. 



