CLASS XXII. ORDER II. 12/ 



Maschalocarfus Calyptre small : peduncle 

 arillary : stem sarmentose. 5 6. 4 — julaceum^ (creep- 

 ing moss) ascending, leaves ovale acute nearly as 

 long as the peduncle. 



3. Teeth alrjays 16, and s/ilit' 



DicRANUM. Each tooth split part of the way 

 from the tip towards the base, incurved and solid. 

 (Muhlenberg found 23 species in North America.) 

 56. 4 — bryoides^ (fork moss) leaves 2-rowed com* 

 pressed, capsule terminal erect. 



Trichostomum. Each tooth split quite down 

 to the base, erect and filiform. 56. 4 — pallidum^ 

 (hair-mouth moss) stem simple short, leaves capil- 

 lary and sheathing. 



4. Teeth 16, 32 or 64, connected. 



PoLYTRicHUM. Tips of the teeth all meet In a 

 flat membrane, which extends over most of the 

 mouth of the capsule : calyptre mostly composed 

 of hair. 56. 4 — junijiermum^ (hair-cap moss) cap- 

 sule square, leaves lance-linear with rough keels. 



5. Teeth 16, 32, or 64, in fiairs. 



DiDYMODON. Capsule without any apophysis 

 below its base. (The sfilachnum^ having teeth 

 sometimes in pairs, is best distinguished from this 

 genus by its apophysis.) 56. 4 — linear e^ (double- 

 tooth moss) leaves linear. 



D. Cafiaule luith a lid^ and furnished with a single 

 peristome firoceeding only from the inner surface 

 of the cafisule. 



Barbula. Peristome consists of twisted fila- 

 ments. 56. 4 — ajiiculata^ (spiral-tooth moss) stem 

 short, leaves remoiish lance-oblong. 



DiPHAscuM. Teeth vein-like, lying on a conic 

 plaited membrane ; capsule inflated almost sessile 



M 



