GENERAL REMARKS. 371 

 Plate CXII. Fig. I. 



Bartramia and Funaria are in the structure of the theca 

 and peristome very nearly allied. The opposition of the 

 teeth of the peristomes in the latter arises from cohesion ; 

 each tooth of the inner being composed of two ciliolae, be- 

 longing to different teeth. 



This is indicated by the line which may be observed run- 

 ing along the centre of each, not being a continuation of the 

 plication, as is invariably the case in all others, and by the 

 analogy of Bartramia, in which the cilia of different teeth 

 are aproximated in pairs, but do not cohere.* 



These genera agree likewise in the incompletion of the 

 longitudinal line, indicating the composition of the outer 

 teeth. This line is interrupted in Bartramia, and appears 

 totally obsolete in Funaria. Bridel observes under Bartamia 

 Bryol. Univ. 2-32. " Habitus proprius vix tantella ad Weis- 

 sias ramosas accedens." This affinity so far as habit is 

 concerned, is very strong, and is borne out by the structure 

 of the sporules, and the apparent simplicity of the teeth of 

 the peristome. 



With regard to the value of this latter character ; it would 

 appear that not much reliance is to be placed on it, at least 

 in certain of the subdivisions. 



As I have before observed in Weissia and Bartramia, it va- 

 ries in some species of Neckera ; it is nearly, perhaps quite 

 complete ; and in one species is accompanied by a simi- 

 lar incompletion of the teeth of the inner peristome, a very 

 unusual character. In one species of Pterogonium, No. 589, it 

 likewise occurs ; but here it is perhaps observed by the opacity 

 of the teeth. 



In a species of Bryum, it is likewise complete. In Dicra- 

 noideae, in which I include Dicranum, Grimmia, Tremato- 

 don, Trichostomum and Didymodon, this composition is 



* Vide Bartamia tomentosa Muse. Exot. 1. t. 19. 



