KEY TO THE GENERA. xliii 



V. Leaves with enlarged (often brownish) angular cells 

 (acrocarpous). 



/Leaves serrate above 26. Dicranum 



\ Leaves entire, or finely serrulate at apex only 2 



/Cells short, more or less quadrate 3 



\ Cells elongate 22. Blindia 



, /Ls. much crisped when dry ; plant small 23. Dicranoweisia 



■'VLs. not or only slightly crisped 26. Dicranum 



W. Leaves with exeurrent nerve, or with long, fine 

 subulate points into which the nerve runs. 



/Cells not twice as long as wide, usually quadrate or roundish 2 



\ Cells elongate, or with pointed ends 13 



toothed in upper part, or with long, fine, denticulate subula 3 



entire in upper part, or with a few teeth at apex only 7 



/Ls. short, glaucous, mealy-looking; plant small ij. Stzlania 



■'XLs. not glaucous, or else long and narrow 4 



KLt 



papillose, long and narrow, spreading or erect 69. Barttamia. 



smooth, squarrose or secund 5 



.. subulate-setaceous, secund 11. Dilrichum 



ovate or lanceolate, squarrose 6 



with pale zone at margin and wide apex 41. Leptodontium 



without pale margin, tapering to narrow apex 44. Pleurochtzte 



4{l1 



*{L S : 



/Cells rounded, incrassate ; ls. short 48. Zygodon 



'\Cells more or less quadrate or oblong 8 



„/Leaves more or less ovate, orobovate, or large and oblong 9 



\ Leaves ovate-lanceolate, lanceolate, or linear 10 



/Ls. large, opaque with coarse, multind papillae 46. Encalypta 



"\Ls. smooth or finely papillose* 39. Tortula 



/Margin usually recurved ; ls. more or less lanceolate or ovate-lanceolate 11 



\ Margin plane or incurved 12 



{Ls. more or less toothed at apex, not red below 16. Ceratodon 

 Ls. entire at apex, or toothed, and the lower ones red 40. Barbula 



/ Ls. glaucous, serrate near base, entire above 42. Weisia 



\Ls. entire below (or slightly crenulate near base only)** 43. Trichostomum 



/Ls. papillose, serrate 14 



^ \ Ls. smooth 15 



{Ls. very long and narrow ; branches not whorled bg. Bartramia 

 Ls. shorter and wider ; branches often whorled 70. Philonotis 



{Ls. subulate ; cells narrow-oblong*** 21. Dicranella 

 Ls. ovate or lanceolate ; cells rhomboid yy. Bryum 



X. Leaves without exeurrent nerve (acrocarpous). 



/Leaves with basal cells sinuose or nodulose 2 



\ Basal cells not sinuose nor nodulose 3 



f Basal cells very long and narrow, nodulose 30. Rhacomitrium 



[Basal cells shorter, sinuose, or else nerve 2-winged at back above ...29. Grimmia 



{Cells elongate or pointed at the end 4 

 Cells short, usually quadrate or rounded 12 



* This would also include some species of Pottia, not likely to be gathered without fruit. 



** This would include some species of Weisia^ mostly with involute leaf-margin, but hardly likely to 



be gathered without fruit. 



*** Including Dztrickum, hardly to be distinguished without fruit. 



Ki 



