MOSSES WITH A HAND-LENS IX 



PAGE 



Capsule dehiscing by four valves, as in the 

 Hepatic^, almost exclusively alpine or sub- 

 alpine. Andreaeaccae. 15 



Capsule dehiscing by an operculum ; peristome 

 of 16 jointed teeth 8. 



Peristome single (very rarely lacking), with 

 teeth not imited in pairs, but usually per- 

 forate or bifid, richly colored and rarely re- 

 flexed when dry. Plants often hoary with 

 colorless leaf apices, nearly all growing on 

 rocks. Grimmiaceac. 5' 



Peristome double (with one or two exceptions), 

 teeth often united in pairs, rarely perforate, 

 usually reflexed when dry, inner peristome 

 of very narrow linear erect segments. 

 Plants very rarely hoary, mostly tree-grow- 

 ing Orthotrichaceac. 78 



Peristome of four large distinct unjointed teeth 



Georgiaceae. 17 



Peristome having an inner plaited whitish cone ; 

 outer peristome of shorter teeth often pres- 

 ent. Odd plants best recognized by ^ refer- 

 ence to the illustrations Buxbauiniacciw. 28 



Peristome lacking, or of more than four teeth. . . .10. 



Peristome of 32 to 64 short teeth, joined at the 

 tips to a membrane which nearly closes the 

 mouth of the capsule ; calyptra densely hairy 

 with long whitish hairs (except Catharinca) ; 

 leaves with numerous vertical lamellae on 

 the upper surface of the costa. Plants large 

 and very dark colored, growing on soil. .. . 



Polytrichaceae. 18 



Peristome when present consisting of 16 to 32 

 plainly articulate teeth, frequently lacking; 

 mouth of capsule not closed by a membrane. .11. 



Capsules cleistocarpo lis. .. .i?rj!c/ii'n in Dicranaccac. 36 



Capsules cleistocarpous. . .^4jio«(4i»i in Tortulaceae. 37 



Capsules gymnostomT-s ; leaf-cells small, dense 



Poitia and Weisia in Tortulaceae. 91, 64 



