BRYOPHYTA. 13 



Ceratodon. Plants cespitose or pulvinate, green, Bometimea 

 yellowish. Stein dividing by innovations from under the peri- 

 clnvtium. Leaves Lanceolate-subulate, clasping al base, spread- 

 ing, with a strong percnrrent costa. Capsule ovate-oblong. 

 Teeth 16, purple, clefl into two equal parts. 



9 1). ( f apsuL ■ 'I or sorra what pyriform, 



13 a, Plants of small sun , stt m short. 



Weisia. Plants cespitose or pulvinate. Leaves lanceolate 

 or linear-lanceolate and subulate, costate, twisted when dry. 

 Capsule long-stalked. Teeth 1G. J. id beaked. 



13 b. Plants of considerable length, consisting 

 of long creeping stems bearing very 



sh<>rt, erect, fertile branchlets. 



Drummondia. Plants forming wide appressed mats. Leaves 

 crowded, reflexed or squarrose when moist, sub-imbricate or 

 crispate when dry, costate. opaque in the upper part, hyaline at 

 the base. Capsule on an erect stalk. Teeth 1G. Lid with a 

 straight beak. 



5 c. Teeth 32. 

 14 a. Teeth thread-like, arising from a tessellated 

 rm idbrane, entirely free above, twisted to the 

 left. 



Barbula. Plants cespitose or pulvinate. Leaves gradually 

 lengthening from the base of the stem upward, diaphanous in 

 the lower part. Capsule erect, oval or cylindrical, stalked. 



14 b. Teeth adhering by their points to the mem- 

 brane-like t<>p of the columella. 

 15 a. Leaves not clasping at the base. 



Atrichum. Plants densely gregarious or cespitose, dividing 

 mostly by basilar innovations or in male plants from the centre 

 of the flowers. Leaves ligulate, crispate when dry, narrowly 

 margined, acutely serrate, costa sub-terete, lamellate. Capsule 

 oval or cylindrical, cernuous or arcuate. Lid long-subulate- 

 beaked. Calyptra toothed at the apex, cucullate. 



15 b. Leaves clasping at tht base. 



