Mosses and Lichens 



Veil (calyptrd). Conical, split up one side, falling early. 

 Spore-case. Spherical, grooved longitudinally. 



Pedicel (seta). Slender, |an inch high. 



Teeth (peristome). Outer teeth regular, 

 densely cross-barred, inner segments 

 shorter than the teeth and cleft, cilia imper- 

 fect or none. 



Annulus. None. 



Spores. Mature in spring. 



Distribution. Universal. 



B. pomiformis. 



Bartramia pomiformis. 



B. pomiformis. Leaves. 



THREAD-MOSS 

 Genus LEPTOBRYUM, Schimp. 



The species of the Genus Leptobryum live but one year, the 

 plants are unbranched above, new growths coming only from 

 the base. The generic name from the Greek XeTrro?, slender, and 

 Ppvov, a moss, refers to the slender character of the plants. 



The leaves are narrow, glossy, and turn in different directions. 

 The apex is like an awl and the cells are narrowly rhomboidal 

 above, looser toward the base and rectangular-six-sided. 



The spore-cases are inclined or pendent, long-necked and 

 thin-coated with convex lids tipped with a small point. The 

 teeth are double, the intermediate hair-like segments having cross- 

 bars projecting beyond the edge. 



There are but few species known at present, one of these is 

 found in North America. 



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