with a proposed new Arrangement of the Genera, 55 



16. Dicnemon, Schw. 



17. Pilopogon, Br id. 



18. Dicranum, Hedw. 



Tribe III. Pottiace^e. 

 Cells of the leaves all parenchymatous, often minute, incras- 

 sated and papillose. Capsules astomate, stomate, gymnostomate, 

 peristomate, and diploperistomate. Teeth sixteen or thirty-two, 

 often cohering together : internal peristom^f cilia. Calyptra 

 mitriform, dimidiate, or calymperoid. Small or rather large 

 mosses with chlorophyllose lanceolate or strap-shaped leaves, 

 having terete nerves and smooth or striate capsules : growing on 

 the earth, on rocks, and on trees. 



Sect. 1. Trichostomoidea. 

 Peristome of narrow slender teeth. 



Genus 1. Schistidium, Brid., including Acaulon, C. Muller. 



2. ? Gonomitrium, Hook, et Wils. 



3. Pottia, Ehrh., C. Muller, including Phascum bryoides, P. 

 rectum, P. curvicollum, P. cuspidatum, P. subexsertum, P. splach- 

 noides, P. tetragonum, P. cylindricum, and P. Drummondii ; but 

 scarcely distinguishable from the next genus. 



4. Trichostomum, Hedw. 



5. Barbula, Hedw, 



6. Streptopogon, Wils. 



7. Ceratodon, Brid. 



8. Weissia, Hedw., C. Muller, including Astomum crispum, 

 A. Mittenii, A. multicapsulare, and A. rostellatum of Bryol. 

 Europ. 



9. Syrrhopodon, Schw. 



10. Calymperes, Sw. 



11. Tridontium, Hook. fil. 



Sect. 2. Zt/ffodontoidea. 

 Peristome of broad teeth. 



12. Coscinodon, Spreng. 



13. Glyphomitrium, Brid. 



14. Brachystelium, Rchb. 



15. Gumbelia, Hampe. 



16. Grimmia, Ehrh. 



17. Cryptocarpus, Dzy. et Molk. 



18. Drummondia, Hook. 



19. Zygodon, Hook, et Tayl. 



20. Orthotrichum, Hedw. 



21. Macromitrium, Brid. 



22. Schlotheimia, Brid. 



23. Encalypta, Schreb. 



