126 CLASS XXII. ORDER II. 



having no lid it falls off closed. (The smallest of 

 mosses, never half an inch high, and more common- 

 ly not the eighth of an inch, and almost sessile.) 

 56. 4 — crisfium^ (earth moss) having a stem, leaves 

 lance-acuminate. 



B. Capsules ivith a lid and nvithout a peristome. 



Sphagnum. Calyptre breaks off transversely, 

 leaving the lower half on the capsule : lid cadu- 

 cous. (Found onlv in swamps. Becomes reddish 

 when old.) — latifolium^ (peat-moss) leaves ovate ob- 

 tuse close-imbricate. 



Gymxostomum. Calyptre wholly falling off: 

 lid caducous — jiyriforvie^ (toothless moss) leaves 

 ovate acute spread, capsule pear-form, lid obtuse 

 pointed. 



C. Capsule luith a lid and furnished with a sijigle 

 peristome, proceeding from the outer surface of 

 the capsule^ or from both inner and outer, 



1. Teeth fewer than 16. 



Tetraphis. Teeth 4, taking their origin from 

 both the inner and outer surface of the capsule. 56. 

 4 — pellucida^ (four-toothed moss) nearly transpa- 

 rent in various parts. 



Splachxum. Teeth 8 : capsule with an um- 

 brella-form apophysis below its base. 56. 4— -am- 

 pullaceum, (umbrella moss) apophysis blubber- 

 like. 



2. Teeth always 1 6, and neither splits connected^ nor 



in pair, 



Grimmia. Calyptre smallish-: peduncle termi- 

 nal. 56. 4 — controversa, (awl-cap moss) leaves 

 lance-linear, serrate at top — alpicola^ leaves obtus- 

 ish, capsule obconic nearly sessile. 



