134 SELAGINELLACE/E. 



The name SclagincUa is a diminutive of Sclago, the 

 ancient name of one of the lycopodiums wliich our 

 species greatly resemble. Formerly the quillworts 

 (Isoetes) were united with the genus Selaginclla to 

 form the Selaginellaceae, but as they are regarded at 

 present they not only form a distinct family, but are 

 included in another order. The Selaginellaceae, there- 

 fore, may be said to consist of the single genus Selagi- 

 nclla. 



