4 ANALYSIS OF GEXERA. 



-t- -t- Capsule on a proper pedicel. Vaginule sessile. 



10. Astomum. Plants small. Operculum not easily detached. Calyp- 



tra cacullate. Flowers monoecious. 



11. Gymnostomum. Plants larger. Operculum long-beaked. Calyp- 



tra cucullale. Flowers dioecious. 



12. Ancectangium. Plants cespitose. Stems dichotomous, as in 



i-'leiirocarpi. 



33. Anodus. Plants very short. Capsule small, obovate, long-pedi- 

 cellale. Calyptra cucullate. Flowers monoecious, without para- 

 physes. 



38. Pharomitrium. Capsule immersed, globose. Calyptra oblique, 



plurilobate. Leaves with a long white awn. 



39. Pottia. Capsule small, with a broad orifice. Calyptra cucullate. 



Leaves with a loose hyaline basilar areolation. 



48. Hedwigia. Capsule obovate, immersed. Calyptra mitriform. 



Leaves hyaline, ciliate at the apex. 



49. Pseudobraunia. Capsule long-pedicellate, pyriform. Calyptra 



narrow, cucullate. 



31. Amphoridium. Capsule striate, urceolate. Calyptra cucullate. 



59. Encalypta (1st Section). Capsule oblong-cylindrical. Calyptra 



very long, cylindrical-campanulate. 



60. Calymperes. Calyptra twisted, persistent, plicate, constricted 



at base. 



65. Schistostega. Plants small, delicate, frondlform. Capsule 

 small, globular, pedicellate. Calyptra mitriform. 



70. Pyramidula. Calyptra large, tetragonal, enclosing the capsule 



and dehiscent by lateral slits. 



71. Aphanorhegrna. Capside globose, nearly sessile, splitting trans- 



versely in the middle at maturity. 



72. Physcomitrium. Capsule pedicellate, globose or turbinate. 



Calyptia five-lobate, Avith a long terete straight beak. 



» * Mouth of the capsule furnished with teeth (peristome). 



H- Peristome single. 



++ Teeth of the peristome 4. 



62. Tetraphis. Capsule long-pedicellate, linear. Calyptra mitriform. 



Stems conspicuous. 



63. Tetrodontium. Capsule ovate, Calyptra large, mitriform. 



Plants small, nearly stemless. 



++ ++ Teeth of the peristome 8. 



28. Octoblepharum. Capsule ovate, pedicellate. Leaves thick, 

 membranaceous, of two or more layers of cells. 



++++++ Teeth of the peristome 16. Calyptra mitriform. 

 = Calyptra plicate. 

 » 50. Coscinodon. Teeth cribrose. Operculum very large. 

 -'- 51. Ptychomitrium. Teeth narrowly linear, deeply bifid to near the 

 base. 

 52. Glyphoraitrium. Teeth entire. Calyptra large, covering the 

 capsul(i to below the base, plicate and cleft at base. 

 "^56. Orthotrichum (1st Section). Capsule emerging. Calyptra 

 hairy, campanulate-mitrate. Leaves short, striate when dry. 



