Muscoloma Itineris Assamici. 471 



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the sporula, but to the generally highly complex appara- 

 tus in which these are contained. 



I am not aware whether any one has explained the opposi- 

 tion of the teeth of the peristomes in Funaria. But looking 

 at the situation of the carinas or plicae that exist in the 

 membrane of the inner peristome, which are invariably 

 alternate with the teeth of the outer peristome, and at the 

 allied genus Bartramia, it is evident that the anomaly arises 

 from the cohesion of the component parts of different pro- 

 cesses, each of which thus becomes strictly compound. 



I have approximated Pterogonium to Neckera, on account 

 of its habit, and the laterality of its setae : in its capsule and 

 peristome it approaches nearly to some Weissise. 



Daltonia I have adopted in the sense of Bridel. Neckera 

 heteromalla, which Dr. Hooker refers to Daltonia, agrees 

 entirely with Neckera in its inner peristome, and must, if 

 attention be paid to its mitriform calyptrae, be referred to 

 Pilotrichum of Bridel, or Daltonia of Mr. Arnott ? I have 

 no opportunity of examining Anomodon, which can only 

 differ in the degree of development of the membrane of the 

 inner peristome, and its adhesion to the base of the outer. 

 As the authors of the Muscologia Brittanica state that their 

 Daltonia agrees well in the inner peristome with Anomodon, 

 there is some reason to doubt the accuracy of the generic 

 characters of both these genera, as given in the book 

 alluded to. 



In Neckera I have included Pilotrichum and Cryphcsa of 

 Bridel, and Daltonia of Arnott. It is certainly a heterogene- 

 ous assemblage, particularly as regards habit. I have been 

 guided in this by the existence of every gradation between 

 the truly dimidiate calyptrae of the true Neckerae and its 

 mitriform state in Pilotrichum. The existence of the appendi- 

 culse, which appear to have first excited attention in 

 Drepanophyllum, is now, I believe, for the first time, pointed 

 out as occurring in Neckera. Neither are they limited 



