with a proposed new Arrangement of the Genera. 57 



Tribe VI. Bartramiaceje. 



Cells of the leaves parenchymatous. Capsules pyriforin or 

 globose, gymnostomate, peristomate, and diploperistomate. Pe- 

 ristome as in Bryum, but the processes splitting down the middle. 

 Calyptra dimidiate. Small or very large mosses, mostly with 

 rigid papillose leaves, and pyriform or globose capsules : growing 

 on the earth or on rocks. 



Genus 1. Oreas, Brid. ^ 



2. Catoscopium, Brid. 



3. Plagiopus, Brid. 



4. Meesia, Hedw. 



5. Paludella, Ehrh. 



6. Conostomum, Sw. 



7. Bartramia, Hedw. 



Tribe VII. Mniace^e. 



Cells of the leaves parenchymatous, with cartilaginous walls. 

 Capsules oval or cylindrical, gymnostomate, peristomate, and 

 diploperistomate. Teeth four or sixteen : internal peristome of 

 processes and cilia. Calyptra mitriform or dimidiate. Small or 

 very large and beautiful mosses : growing on the earth, on rocks, 

 or on trees. 



Genus 1. Hymenodon, Hook, et Wils. 



2. Fissidens, Hedw. 



3. Octodiceras, Brid. 



4. Mniadelphus, C. Mutter. 



5. Daltonia, Hook, et Tayl. 



6. Cinclidotus, Pal. de Beauv. 



7. Scouleria, Hook. 



8. Georgia, Ehrh. 



9. Leptostomum, R. Brown. 



10. Leptotheca, Schw. 



11. Timmia, Hedw. 



12. Mnium, Dill., including Cinclidium, Sw. 



Tribe VIII. Hypopterygiace^e. 



Cells of the leaves prosenchymatous. Leaves dimorphous. 

 Capsules gymnostomate ? and diploperistomate. Teeth sixteen : 

 internal peristome of processes and cilia. Calyptra mitriform 

 and dimidiate. Very beautiful mosses, with simple or pinnate 

 stems and tristichous leaves, one row of which are smaller and 

 resemble stipules : growing on the earth or on trees. 



Genus 1. Hypopterygium, Brid. 



2. Cyathophorum, Pal. de Beauv. 



3. ? Helicophyllum, Brid. 



