302 BRYACEjE. 



This genus differs from Bryum chiefly in the habit and in the 

 usually narrower areolation ; still there is a facies about the 

 plants belonging to it by which they may be generally known at 

 once, produced by the narrower leaves, the stems usually more 

 slender, less frequently innovating below the inflorescence and 

 consequently not as a rule producing the densely crowded tufts so 

 usual in Bryum. The nerve, too, always (in our own species) 

 ceases below the point or at any rate fails to reach beyond it, 

 whereas in Bryum it is generally more or less excurrent. The 

 fruit generally shows a more marked differentiation between the 

 capsule and neck than is usual in the latter genus. 



{Ls. wide-ovate, entire, with reddish border of narrow cells 10. Tozeri 

 Ls. not evidently bordered 2 



J" Ls. very decurrent, the lower obtuse ; tufts red within 6. I.udwigii 



\Ls. not or scarcely decurrent, usually acute or acuminate 3 



{Cells wide, over 15 MS capsule very short and small 4 

 Cells narrow, under 15 /i; capsule longer or larger 5 



/Plant soft, 1-3 inches ; leaves glaucous-green 9. albicans 



^\ Plant rigid, \-\ inch; leaves not glaucous 8. carnea 



/Capsule long and narrow, with long neck 6 



-•\Capsule oblong or pyriform, neck short 8 



,/Neck very long, longer than capsule ; peristome with cilia 2. elongata 



\Neck shorter than capsule ; cilia absent or rudimentary 7 



/Male flower gemmiform ; lid of capsule usually acuminate 1*. acuminata 



' \Antheridia naked in axils of comal ls. ; lid usually muticous j. polymorpha 



o/Upper ls. very long, shining, reddish at base .3. cruda 



\ Leaves shorter, not red (except the nerve) 9 



/Paroicous, antheridia in axils of upper leaves 10 



"\Dioicous II 



/Ls. acute, serrate above ; capsule usually contracted below mouth 4. nutans 



\X&. subacute, often cucullate, subentire ; capsule small at mouth ...4*. cucullata 



{Upper ls. nerved to apex, usually mixed with foliaceous gemma? j. annotina 

 Leaves not nerved to apex 12 



/Leaves widely ovate, incurved when dry 7. commutata 



\ Leaves narrow, straight and appressed when dry 7*. gracilis 



A. POHLIA. 



Slender ; leaves suddenly elongate, and narrow in the comal 

 tuft, with narrow, linear-rhomboid cells ; not bordered, nor 

 distinctly dimorphous. Capsule inclined or horizontal, long- 

 necked, oblong. Inner peristome with a narrow membrane, 

 cilia absent or rudimentary; processes entire or only slightly 

 perforated. 



1 . Webera polymorpha Schp. (Pohlia polymorpha Hornsch., 

 Braithw. Br. M. FI.) (Tab. XLI. I.). 



Variable in habit and in the size of its parts. Slender, 

 loosely tufted, usually about half-an-inch high ; stems almost 



