Brown. — On tJie Genus Orthotrichum. 425 



Section C. 



Calyptra not pilose. Peristome single. 



24. Orthotrichum cyathiforme, sp. nov. 



25. „ acutifolium, sp. nov. 



26. „ hurunui, sp. nov. 



27. „ minutum, sp. nov. 



28. „ brevirostrum, sp. nov. 



Section D. 



Calyptra not pilose. Peristome double. 



29. Orthotrichum avonense, sp. nov. 



30. „ nudum, sj). nov. 



31. „ minimifolium, sp. nov. 



32. „ obtusatum, sp. nov. 



Calyptra pilose. Peristome not found. 



33. Orthotrichum parvulum, sp. nov. 



34. „ arctum, sp. nov. 



Calyptra not found. Peristome single. 



35. Orthotrichum parvithecum, sp. nov. 



36. „ latifolium, sp. nov. 



37. „ subulatum, sp. nov. 



38. „ erectum, sp. nov. 



39. „ robustum, sp. nov. 



Calyptra not found. Peristome double. 



40. Orthotrichum curvatum, sp. nov. 



Section A. 



Calyptra pilose. Peristome single. 



1. Orthotrichum conicorostrum, sp. nov. 



Plants monoecious, yellowish-green, growing in small tufts 

 Jin.— Jin. high, branched by innovations. Branches short, 

 spreading. Leaves imbricating, spreading ; lower ones small ; 

 middle and upper linear-lanceolate, tapering into an acute 

 point from an ovate erect base, sheathing. Margins plain, 

 entire, very concave. Nerve disappearing in the apex. Areola : 

 Upper punctiform, lower oblong. Leaves suberect when 

 dry. Perichcstial leaves erect, small, linear-lanceolate, obtuse, 

 concave. Margins plain, entire. Nerve ending below the 

 apex. Fruitstalk j^in. long, capsule subpyriform, tapering 

 into the fruitstalk. Peristome single, 8, bigeminate, entire. 

 Operculum conic, one-third the length of the capsule. Calyp- 

 tra as long as the capsule, mitriform, plicate, pilose. 



