1920] 



TAYLOR— SUCCESSION OF MOSSES 



487 



elimination of such swampy regions may be very 



By 



the filling up of depressions the 

 either as prairie or forest. The 1 



may be made 

 drained deene 



from an economic standpoint 



commercial 



value. 



which will further 



from hydronhvtic to mesoDhvtic conditions will 



number of acres of productive land reclaimed from a state of 

 total non-productivity, and also lead to better health conditions 

 for the inhabitants of the surrounding country. 



TABLE II 



Presence of moss species in associations of hydrarch succession 



Species 



Open water 



Sedge mat 



Tamaracks 



Swamp forest 



Beech-maple 



Amblystegium riparium.. 

 Anomodon rostra tus 



p 





p 

 p 









p 

 p 

 p 





Aulacomnium palustre 





P 

 P 

 P 

 P 

 P 





Brachythecium sirulare 





p 

 p 

 p 



p i 

 p 





Campylium stellatum.. . . 



p 





Campylium hispidulum 







Calliergon cordifolium 





p 

 p 

 p 





Climacium americanum 







Catharinea undulata .... 







P 



Drepanocladus aduncus. . 

 Drepanocladus fluitans.. . 



p 

 p 



P 

 P 



p 









Dicranum scoparium .... 





p 

 p 

 p 

 p 

 p 

 p 

 p 

 p 

 p 



p 

 p 

 p 

 p 

 p 

 p 

 p 

 p 

 p 





Entodon cladorrhizans 





• 





Leucobryum elaucum 









Mnium cusDidatum 









Polytrichum commune 









Rhodobryum roseum .... 









Stereodon haldanianum 









Thuidium delicatulum 









Thuidium recoesiitum. . . 

















Miller are mostly of recent origin 



mosses 



account for the fact that the few species are present. 



is may 

 mosses 



grow 



ery 



prohibiting their spread into distant ponds except when carried by 



animals 



^s previously mentioned, these mosses 

 recovery after periods of desiccation 



must also be able to resist covering to some extent, as these pannes 



*- 



