No. 441.] 



NOTES AND LITERATURE. 



635 



the plant in question is to be included under another name here ; this 

 makes the total number of species to be credited to the Flora some- 

 what uncertain; but leaving out about 50 forms, which may be con- 

 sidered as erroneously or uncertainly reported, the following species 

 or named varieties and forms will approximately represent the extent 



Cyanophyceae 99 26 



Chlorophyceae 65 76 



Phaeophyceae 1 147 



Rhodophycea? 9 214 



Total 174 463 



This is really a much richer list than any one had before supposed 

 probable ; the proportion of Cyanophyceae is exceptionally large, com- 

 paring well with the same order in regions which have long been 

 studied by resident botanists. Dr. Setchell is well known as a spe- 

 cialist on the Cyanophyceae, and in the expedition along the coast of 

 Alaska recognized many forms which would probably be overlooked 

 by most collectors. The Laminariacece are also well represented, 

 and to Dr. Setchell is due the clear presentation and arrangement 

 of these perplexing plants. 



that of the northeast coast of America. Comparatively few marine 



and the common species are mostly found also in northern Edrope, 



apart from this element there are a few cosmopolitan species, common 

 to both sides of the continent. A few species are common to the 

 Flora of eastern Asia, and a few are common to the European Flora 

 but not found on the west side of the Atlantic ; the remaining species, 

 about half of the whole, in the case of the red Algae more than half, 

 are, as far as known, limited to the Pacific coast of the United States. 

 As regards the fresh water Algae, the case is quite different ; nearly 

 all the species are cosmopolitan, some in all latitudes, some in tem- 

 perate regions only; very few are limited to this region ; it is inter- 

 esting to note that most of the cosmopolitan marine species are of 

 the Cyanophyceae and Chlorophyceae, orders more largely fresh 

 water than marine. It is probably accidental that the four species 

 of Characeae, all European, are reported from Alaska only, in the 



