INTRODUCTION TO CRYPTOGAMIC BOTANY. 497 



species are but few, and belong partly to the northern hemi- 

 sphere, partly to South America, below the line. Mielichoferia 

 has representatives also at the Cape, in Abyssinia, and in 

 Kumaon. Schizhymeniwm, Harv., a Cape genus, has a 

 double peristome, the inner of which is beautifully cancellated, 

 and the outer very deciduous. 



V. Pleurocarpi, Bridel. 



Sporangia lateral, growing from purely perichEetial branches. 



554. If there was some room for doubt about the signifi- 

 cance of the fruit-bearing branches in the Oladocarpi, there 

 is none here. They are reduced to so small a size that they 

 bear little or no resemblance to the main branches from which 

 they are developed, and the leaves with which they are beset 

 are purely perichsetial. In one or two cases, as in Fissidens 

 and Ancectangium,, the connection with Acrocarpous mosses 

 is so complete, that there is little to separate them, save the 

 mode of growth; but in the generality of cases there is scarcely 

 any immediate connection with the earlier tribes. 



Ancectangiei. — Sporangium ovate or spherical, gymnostomous. 



Drepanophyllei. — Leaves equitant. Peristome single. 



Fahroniei. — Leaves imbricated. Teeth 16, arranged in pairs. 



Fontinalei, — Aquatic. Sporangium subsessile. Peristome 

 double. 



Cryptotheciei. — Leaves imbricated. Calyptra mitriform. Pe- 

 ristome double. Habit diffuse. 



Uookeriei. — Stems flattened. Leaves imbricated. Calyptra 

 mitriform. 



Neckerei. — Stems mostly compressed and pinnate. Peduncle 

 usually short or wanting. Calyptra dimidiate. 



Hypnei. — Leaves mostly imbricated. Peduncle long. Peri- 

 stome double. Calyptra dimidiate. 



Leucodontiei. — Leaves imbricated. Sporangia erect. Calyp- 

 tra dimidiate. 



Rhizogoniei. — Sterile stems frondose ; fertile periohsetial. Ca- 

 lyptra dimidiate. 



PhyUogoniei. — -Leaves distichous, folded. Peristome single. 

 Calyptra dimidiate. 



Hypopterygiei. — Leaves trifarious, the third row smaller than 

 the others (amphigastra). 



Racopliaoei. — Leaves dimorphous. Calyptra pilose below. 

 32 



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