CLASSIFICATION. 67 



Tribe XVII. Nxkerea. Primary stems creeping, the 

 secondary erect or creeping with forked or pinnate branches; 

 leaves smooth ; cells minute ; capsule generally enclosed in 

 the perichaetium (the leaves immediately surrounding the base 

 of the fruit-stalk} ; calyptra split on one side, conical, often 

 hairy ; peristome simple or double, rarely absent. 



To this family belong Cryphtza, Neckera, Homalia, etc. 



Tribe XVIII. Leucodontece. Primary stems creeping, 

 the secondary erect or pendent, simple or ramose ; leaves 

 solid, subscarious, plaited lengthwise ; leaf-cells in distinct 

 rows, dot-like, angular ; calyptra large, split on one side. 



A tribe well represented in our flora, and comprising 

 Leucodon, Pterogonium, Antitrichia, etc. 



Tribe XIX. Hookeriece. Plants small, soft, sparingly 

 and irregularly branched ; leaf-cells large ; calyptra conical- 

 lobed at the base ; peristome double. 



A tribe of very distinct mosses, comprising the genera 

 Daltonia, Hookeria, Pterygophyllum. 



Tribe XX. Fabroniea. Plants very small ; leaves thin, 

 delicate, ciliate-dentate or entire ; capsule pear-shaped, with 

 a distinct collum, or neck; calyptra split on one side; 

 peristome simple or none. 



A small group, sparingly represented, comprising th'e 

 genera Habrodon and Myrinia. 



Tribe TXI.Leskeace<z. Primary stems creeping ; leaves 

 soft ; cells minute, hexagonal, papillose, and chlorophyllose 

 above, hexagonal-rectangular below ; capsule symmetrical, 

 erect or curved; peristome double; teeth linear-lance- 

 shaped, awl-shaped, segments shorter than the teeth ; cilia 

 none or rudimentary, rarely perfect. 



A group embracing several very widely spread mosses 

 and others equally limited in their distribution, such as 

 Myurella, Leskea,Anomodon($\g. 37), Thuidium (fig. 23), etc 



Tribe ~X33.l.Orthotheciea. Plants in wide yellow mats ; 

 leaves smooth; leaf-cells narrowly rhomboidal or linear, 

 square at the basal angles; capsule erect, symmetrical; 

 peristome double. 



In this group are placed Pylaisia, Homalothecium, 

 Climatium, Orthothecium. 



