No. 523] 



THE " SPECIES PLANT ARUM " 



387 



The number of genera can be determined without diffi- 

 culty. The counting of the species is less easy since in 

 some cases it is not quite certain whether under a given 

 name Linnaeus intended to indicate a species properly 

 speaking or merely a form or variety. In my enumera- 

 tion I have included only those forms clearly designated 

 as species, omitting subspecific forms. That the enu- 

 meration here given is conservative is shown by the fact 

 that, while according to the "Codex Linnaeanus" the 

 total number of species in the "Species Plantarum" is 

 5,938, the total of my list is 5,247, divided as follows: 



Genera. Species. 



Phrenogams 1,049 4,630 



Cryptogams 50 617 



Total -..1,099 5,247 



Of the 50 genera and 617 species, 16 genera and 189 

 species are Filices and there are in addition 24 species 

 of the genus Lycopodium which was placed by Linnaeus 

 in Musci. Among the Filices are to be found numerous 

 characteristic species of America and the tropics and in 

 this respect the treatment of the group by Linnaeus is 

 quite comparable with his treatment of phamogams. For 

 nomenclatorial purposes the Filices and Lycopodium are 

 even at the present day treated in the same manner as 

 phamogams, and it is a well-known fact that it is the cus- 

 tom to unite the vascular cryptogams and the phaenogams 

 in floristic works. So far as we are now concerned the 

 higher cryptogams need not enter into the discussion, 

 but from the nomenclatorial standpoint must be classed 

 with pha?nogams and there are therefore left 404 species 

 and 44 genera for all the Bryophytes and Thallophytes 

 described in the "Species Plantarum.' ' But even in this 

 small number is included the genus Spongia under Algae 

 with 11 species, of which at least the greater part are not 

 even plants in any sense. Furthermore, among the Bryo- 

 phytes and Thallophytes there are almost no extra- 

 European species and of the European species a great 



