634 (34) Musci. (mosses.) 



9. O. Canadense, Br. & Sch. Differs from the preceding species in its 

 more acute leaves, its shortly-exserted capsule smaller and not so constricted 

 under the mouth, and in the 16 cilia of the inner peristome. — Central Ohio : 

 rare; on trees. 



10. <J>. afTlne, Schrad. Larger and coarser than any of the foregoing ; 

 leaves oblong-lanceolate, rather obtuse, revolute (the upper ones rather undulate) 

 on the margins, strongly papillose on both suifaces ; capsule elliptic-oblong with 

 a tapering apophysis, emersed ; cilia as in No. 7 ; calyptra slightly hairy, green- 

 ish. — On rocks. Lake Superior, Agassiz. (Eu.) 



11. O. Specidsum, Nees. Stems elongated, l'-2' high, loosely casspi- 

 tose ; leaves lanceolate, keeled, with recurved margins ; capsule shortly exserted, 

 tapering into the pedicel, indistinctly striated, when dry ribbed near the mouth 

 only ; cilia of peristome 8 ; calyptra large, very haiiy. — Trees ; on banks of 

 the St. Lawrence Eiver. (Eu.) 



12. O. leiocarpuin, Br. & Sch. Size and mode of growth much as in 

 the last ; readily distinguished by its capsule without strias, and entirely smooth 

 when dry; and by the 16 large erose-articulate cilia of the peristome. — Trees, 

 Lake Superior, Agassiz. (Eu.) , 



§ 2. Capsule muck exserted. Monoecious. 



13. O. liUdwigii, Schwasgr. Stems mostly decumbent ; leaves linear- 

 lanceolate, somewhat fasciculate, when diy slightly twisted, the margins plane or 

 slightly undulate ; capsule pyriform, when dry very much contracted and plicate 

 at the mouth ; inner peristome absent ; caly|>tra moderately hairy, laciniate at 

 the base. — On trees, Alleghany Mountains. (Eu.) 



14. O. Hutcllinsise, Smith. Stems aggregated in rather loose tufts; 

 leaves lanceolate, carinate, scarcely reflexed on the margins, when diy erect-ap- 

 pressed, not twisted ; capsule subclavate, with 8 broad strife, the apophysis grad- 

 ually tapering into the long pedicel ; ciUa of the peristome 8 ; calyptra large, 

 copiously hauy. — Eocks; common in mountainous districts. (Tab. IE.) (Eu.) 



15. O. crispum, Hedw. Stems closely tufted ; leaves linear-lanceolate 

 from a dilated base, much contorted and crisped when dry, slightly undulated ; 

 capsule clavate, when dry constricted under the mouth, with 8 strong ribs con- 

 tinued down the veiy long tapering apophysis ; i^eristome with 8 cilia of a dou- 

 ble row of cellules ; calyptra very hauy ; spOrules brown. — Trees, Alleghany 

 Mountains. (Eu.) 



16. O. crispulum, Hornsch. More delicate than the last; leaves nar- 

 rower and less crisped when dry ; capsule shorter, pale, of thin texture, when 

 dry not contracted below the mouth, its ribs less distinct ; apophysis shorter, 

 passing more abmptly into the pedicel; sporules green. — Trees, Alleghany 

 Mountains. (Eu.) 



17. O. Brucliii, Brid. Veiy closely allied to the last two species ; from 

 No. 15 it differs in its less crisped leaves, and deeper-colored larger capsule; 

 from No. 16, by the nan-owed mouth of the capsule and the much longer apo- 

 physis ; from both by its longer pedicel, and the cilia of the peristome of but 

 one row of cellules. — White Mountains, N. Hampshire, Oakes: rare. (Eu.) 



