DICEANEI. 277 



at the base, those at the angles subquadrate and rather in- 

 flated; lid obliquely rostrate. 



2. D. falcatum, Hedw. ; densely tufted ; leaves strongly 

 •falcato-secund, lanceolato-subulate ; fruitstalk rather short 

 and thick ; sporangium cernuous, short, obovate, strumous at 

 the base ; lid rostrate. — Hook, ty Wils. t. xvii. ; Eng. Bot. t. 

 1989. 



On rocks and the earth in alpine districts. Bearing fruit 

 in autumn. 



Forming dense dark-green tufts. Stem decumbent at the 

 base, naked below ; leaves strongly falcate, channelled above ; 

 tip serrulate ; leaf-cells as in the last ; sporangium without 

 striae, swollen ; lid large ; peristome larger than in the last. 



3. D. Blyttii, Br. fy Schimp. ; soft, tufted; stems much 

 branched, brittle ; leaves spreading or subsecund from an erect 

 base, lanceolato-subulate, entire; sporangium cernuous, curved, 

 without striae ; ring narrow ; teeth narrow, inflexed when dry, 

 — Hook, fy Wils. t. xxxix. 



On alpine and subalpine rocks. Scotland and Wales. Bear- 

 ing fruit in August. 



Monoicous ; forming dull brownish-green patches. Leaves 

 shorter than in the two last, more delicate, not so inclined to 

 be falcate ; sporangium free from striae, even when dry ; male 

 flower not seated beneath the female, but at the base of an 

 innovation ; ring simple. 



4. D. Scottianum, Turn. ; densely tufted ; stem radiculose ; 

 leaves spreading and subsecund, twisted above when dry, lan- 

 ceolato-subulate, concave, entire; nerve strong, prominent 

 behind, subexcurrent ; sporangium elongated, slightly curved, 

 tapering below ; peristome short, teeth cloven once or twice at 

 the tip only .—Hook. 8f Wils. t. xviii. ; Eng. Bot. 1. 1391, 1977. 



On mountainous rocks. Bearing fruit in summer. 



