262 CHECKLIST OF THE FERN ALLIES. 



Lycopodititu clftrafHiH- L. 



Lycopodium clavatam f. m-onostdchyon Hook. 



Lycopodium complanatum L. 



Lycopodium complanatum chamcecyparissus (A. Br.) 



Lycopodium chamacypartssus A. Br. 



Lycopodium tristachyon Pursh. 



Lycopodium complanatum /. flabelliforme Fernald 

 Lycopodium cotmtldiiutiun f. Wibbei Haberer 

 Lycopodinm lucidulum Michx. 

 Lycopodium lucidulum porophyl am (Lloyd Under\\.) 



Lycopodium porophylum Lloyd & Undenv. 

 Lycopodium lucidulum f. occidentale Clute 

 Lycopotliutn, inundatum L. 

 Lycopodium inundattim /. Biyelovii Tuckerm. 

 Lycopodium obsctirum L. 



Lycopodium dendroideuni Michx 

 Lycopodium sabincefolium Willd. 

 Lycopodium selago L. 

 Lycopodium Sitcliense Rupr. 



MARSILIA. 



Marsilia quadrifolia L. 

 Marsilia macropoda Engelm. 

 Marsilia uncinata A. Br. 

 Marsilia vestita H. & G. 



PILULARIA. 

 Pilularia Americana A. Br. 



PSILOTUM. 



Pit-Hot n in trif/uefruni S\v. 

 Psilotum nudum (L.) 



SELAGINELLA. 



SelayineUa apus Spring. 

 Sel(ff/in<'//(t ffrenicola Undervv. 

 Selaginella arenaria Underxv. 

 Selayinella Hiyctorii Underw. 



