The Bladder-cap Mos 



Distribution. In the Rockies and in Maine, also in Europe. 



The Yellow Collar-moss, Splachnum luteum, Linn., 1. c. 



The Yellow Collar-moss differs from the Red Collar-moss in 

 having the margins of the leaves not so coarsely toothed and in 

 having the enlarged portion of the pedicel under the spore-case 

 convex, umbrella-like, bright-yellow, and an inch in diameter. 

 The pedicel is often six inches long. 



The name is from the Latin luteum, a weed, probably a yellow 

 one as the derivatives all signify "yellow." This moss is also 

 found on dung in bogs. The spores are mature in autumn. 



THE BLADDER-CAP MOSS 



Genus PHYSCOMITRIUM, Brid. 



The species of the Genus Physcomitrium rarely live more 

 than one year. They have a delicate texture and grow in loose 

 tufts. The plants are sparingly branched, and bear compara- 

 tively large, soft, obovate or spatula-shaped, taper-pointed leaves 



Plant. 



P. twrbinatwm. 



Leaf. 



with large transparent cells. The spore-cases are ovate or spher- 

 ical, and erect upon immersed or exserted pedicels. They have 

 convex lids but no teeth, and the spore-sac (sporangium) is free 

 from the spore-case wall, adhering to it only by thread-like 

 strands. The veils are lobed at the base and scarcely descend 

 to the middle of the spore-case. 



The generic name Physcomitrium is a combination of two 



207 



