12 GUIDE TO CRYPTOGAMS. 



mostly entire, rarely erose-denticulate at the apex, often tipped 

 with a whitish hair. Capsule emerging. Teeth lanceolate, 

 purple, lngroscopic. Calyptra often hairy. 



6 b. Calyptra cuculliform. 

 8 a. Leaves 2-ranked. 



Fissidens. Leaves conduplicate below, alate on the back, 

 the upper part expanded into a simple vertical lamina, with 

 a percurrent or excurrent costa. Lid and peristome as in 

 Dicranum. 



8 b. Leaves spreading every way. 

 9 a. Capsule cernuous and inclined, unequal. 

 10 a. Capsule with a long narrow collum. 



Trematodon. Plants loosely cespitose, short, sparingly 

 branched. Leaves lanceolate-subulate, costate, cells large, 

 especially at the base. Capsule long-stalked, oblong, slightly 

 arcuate. Teeth 16. Narrowly lanceolate, cleft to near the base, 

 or lacerate, purple. Lid long-subulate. 



10 b. Capsule with a short broad collum. 



11a. Capside when ripe, greenish, surface 

 smooth. 

 12 a. Plants loosely cespitose, green, some- 

 times yellowish, not spongy. 



Dicranum. Stem usually once or more forked, radiculose 

 at base, or covered thickly for its whole length with radicles. 

 Leaves spreading, mostly secund, lanceolate-subulate or long- 

 lanceolate, costate, cells at the basal angles often larger and 

 colored. Teeth 16, bifid, purple at base. Lid subulate-beaked. 



12 b. Plants densely cespitose or pulvi- 

 nate, whitish, spongy like Sphag- 

 num, soft 'when moist, brittle when 

 dry. 



Leucobryum. Leaves close, thickish. Capsule, peristome 

 and lid as in Dicranum. Calyptra large, whitish. 



lib. Capside when ripe very dark red, 

 striate and deeply furrowed. 



