334 Proceedings of the Royal Irish Academy, 
Teeth of peristome deeply cleft in filiform 
processes ; calyptra cuculliform ; capsule 
striated, swollen at the neck into a short 
struma, , . . . . .7. Cekatodon. 
Teeth of peristome entire ; capsule oval, 
striated, 8. EHABDOWEissrA. 
Teeth of peristome perforated ; capsule without 
annulus, . . . . , .9. Blindia. 
Teeth of peristome connivent, irregular, 
fragile, . . . . . . .10. Cynodontitim. 
Teeth split half way down, . . . .11. Arctoa. 
Teeth slightly split, sometimes entire, . .12. DiCHODONTrtjivr. 
Teeth, cloven half way down, into two unequal 
portions, . . . . . .13. DrcRANTjvi. 
aa. Teeth of peristoma, clovea nearly to the base into 32 divisions. 
Calyptra fiinged at the base, . , .14. Campylopus. 
Calyptra not fringed at the base, . . .15. Dicranodontium. 
Leaves distichous. 
Teeth of peristome split into irregular seg- 
ments, or entire, . . . . .16. DlSTICHIUM. 
Tribe 3. Grimmie^. 
Perennial mosses, with more or less elongated stems, having dichotomous 
or fastigiate branches, growing gregariously or in close tufts. Leaves 
short and persistent, not rarely with hyaline or piliferous points ; 
areolation dense and dot- like. Peristome single, of 16 teeth, 
variously perforated or cleft into two or three segments. 
Genera. 
Calyptra small conico-subulate, setse, geni- 
culate, . . . . . . .17. Campylostelium. 
Calyptra mitriform, lobed at the base, . .18. Grimmia. 
Calyptra, small, not extending to the mouth of 
capsule, lacerated or entire at base, . 19. Schistidium. 
Calyptra mitriform, plicate, nearly covering 
the capsule, ...... 20. Glyphomitrittm. 
Calyptra mitriform, deeply furrowed, . .21. Ptychomitrium. 
Calyptra with subulate rough beak, membra- 
naceous and multifid at base, . . 22. Racomftriuji. 
