Vol. 27 



BULLETIN 



No. 4 



OF THE 



TORREY BOTANICAL CLUB 



APRIL 1900 



A Review of the Species of Lycopodium of North Amer 



By Francis E. Lloyd and Lucien M. Underwood 



(With Plates 2, 3, and 4.) 



The genus Lycopodium as represented in North America has 

 never received a careful revision. Various forms, mostly varietal, 

 have been described from time to time but the treatment in the 

 various manuals has been mainly that accepted by European 

 writers, commencing with Linnaeus and closing with Milde. 

 Meanwhile a large amount of material has accumulated and we 

 are m the position to give the genus a preliminary survey and 

 bring our knowledge of the American species up to the datum 

 line of modern collections. Much still remains to be done to 

 clear up certain outlying forms and limit the range and variations 

 of certain species and, if possible, determine the causes involved. 



The genus Lycopodium as treated by Baker * includes ninety- 

 four species and this may be regarded as a very conservative esti- 

 mate of its extent. Certain features of the range of species are 

 of interest. Five species are circumboreal and are distributed 

 more or less widely throughout the North Temperate Zone. 

 Europe has seven species, viz, L. Selago, viundatum, amwt- 

 inum, clavatum, alpimun, complanatum, and chamaecyparissus, all 

 but the second and last being circumboreal and all being found 

 in North America. 



In extratropical North America, Baker recognized ten species. 

 To these six must be added, of which three are here recognized 

 as species for the first time. L. cernuum, a widely distributed 



1 



* Handbook of Fern Allies, 1887. 

 [Issued 21 April.] 147 



