DISTRIBUTION OF MOSSES. 291 



belong strictly to Atlantic North America, not considering the stragglers 

 of widest distribution which are also found on the western declivity of 

 the Rocky Mountains. The number of genera occurring in Alabama 

 endemic to this part of the North American continent is small; although 

 it is difficult to state it with exactness on account of the different 

 views held by authors in regard to their limitation. The following are 

 exclusively Eastern North American : 



Drummondia. Clasmatodon . 



Thelia. Pylaisiella. 



Fully 60 per cent of the genera are represented in the warmer parts 

 of the globe, chiefly in tropical America. Such are the following, which 

 are of an almost exclusively tropical distribution : 



Leucobryum. Schlotheimia. Cryphaea. 



JSyrrhopodon. Rhizogonium. Orthostichella. 



More or less numerously represented in tropical America are the 

 following: 



Sphagnum. Ptychomitrium. Polytrichnm. 



Dicranella. Funaria. Fabronia. 



Campylopus. Bryum. Entodon. 



Tremalodon. Bartramia. Thuidium. 



Fissidens. Philonotis. Rhynchostegium. 



Trichostomum. Catharinea. Eurhynchium. 

 fiarbula. 



Among genera more feebly represented in the Tropics arer 



Mollia. Leskea. Plagiothecium. 



Dicranum. Hedwigia. Amblysiegittm. 



Desmatodon. Brachyihecium. Hypnum. 

 Physcomilrium. 



The following species of the Alabama flora occur in tropical America, 

 those with an asterisk being exclusively American : 



Sphagnum compactum. (West Indies.) Funaria calve scens. (Cosmopolitan; West 



* Sphagnum portoricense. (West Indies.) Indies, Mexico, etc.) 



* Trematodon longicollis, (To Brazil.) * Polytrichum tenue. (Brazil.) 



* DicraneUa debilis. (West Indies to Bra- Rhizogonium spiniforme. (West Indies 



zil.) and Mexico.) 



Leucobryum glauoum. (West Indies.) Thuidium delicatulum. (West Indies and 



* Leucobryum pumilum. (West Indies. ) Mexico. ) 



* Fisffidens polypodioides. West Indies.) Thuidium micropliyllum. (West Indies 



* Trichostomum macrostegium. (Cuba.) and Mexico.) 



Funaria hygrometrica. (Cosmopolitan; * Raphidostegium microcarpum. (Brazil.) 

 West Indies, Mexico, etc.) 



Exclusively of northern distribution extending to the Boreal zones 

 are the following: 



SpUaer ocephalus. Fontinalis. Camptothecium. 



Mnium. Dichelyma. Stereodon. 



Amplioridium, Climacium, 



