CRYJ?TOGAMIA-- MUSCI* 



11. HYPNUM. 



OBS. In Plate IV. there is given a figure in outline of the leaves of the Hypna 

 here described ; and as the same terms will, as far as possible, be used throughout 

 to designate the same forms, the figures maybe useful in ascertaining the species of 

 the other genera of mosses. The number of the figures in the plate corresponds to 

 the number of the species in the text. 



Leaves imbricated all round) erect, and straight. 

 f Leaves entire. 



1. H. serpens, stems creeping, matted, with short slender bran- 

 ches ; leaves small, patent, ovate-acuminate, the nerve evanes- 

 cent ; fruitstalks not 1 inch ; capsule curved, cylindraceous ; lid 

 conical, short. 



Hob. On trunks of trees, and decaying wood, common. 

 Spring, 



2. H. plumosum, stems creeping, matted, irregularly branched ; 

 branches numerous, short, erect; leaves ovate-acute, thickish, 

 the nerve reaching half way ; fruitstalks smooth, ^ inch ; capsule 

 urceolate, subcernuous ; lid conical. 



Hob. On rocks at the sides of rivers and rivulets, liable to 

 be overflowed, common. Spring. 



The specific name is unsuitable, for the moss has nothing 

 plumy about it, and is one of the least beautiful of the 

 genus. The leaf is liable to considerable variation in its 

 figure ; and I have seen it with the margin distinctly ser- 

 rated* 



3. H. populeum, stem creeping, matted : branches numerous, 

 erect ; leaves lanceolate-acuminate, nerved throughout, obscurely 

 serrulate at the points, the margins slightly reflexed ; fruitstalks 

 scarcely 1 inch, smooth ; capsule ovate, cernuous ; lid conical. 



Hob. On trees and stone walls, not rare* Spring, 



