CHAP. XIV LYCOPODINEAL 463 



gametophyte very much reduced and projecting Inil little beyond 

 the spore wall. 



Classification 



A. HomosporecB 



I. Roots always present ; sporangia alike, simple, in the 

 axils of more or less modified leaves, which may form a distinct 

 strobilus, or may be but Httle different from the ordinary ones 

 both in form and position ; prothallia either green or colourless, 

 monoecious. 



Order I. Lycopodiace^ 



Genera 2. — (i) Lycopodium ; (2) PJiylloglossum 



II. Roots absent; vegetative leaves much reduced (^Psi- 

 lotuni) or well developed ; sporophylls petiolate, bilobed ; spor- 

 angia plurilocular ; gametophyte unknown. 



Order II. Psilotace.-e 

 Genera 2. — (i) Psilotuni ; (2) Traesipteris 



B. Heterosporece 



Characters those of Order I., but spores always of two kinds. 



Order III Selaginelle^ 



Genus i. Selaginella 



The LycopodiacecB 



The Lycopodiacese include the two genera Lycopodium and 

 PJiylloglossum, the latter with a single species, P. Drummondit. 

 The gametophyte is known in a number of species o{ Lycopodium, 

 but as yet is quite unknown in PJiylloglossum. The first in- 

 vestigator who succeeded in obtaining the germination of the 

 spores was De Bary,^ who studied the earliest stages in the 

 germination of L. inundatum, but was unable to obtain the later 

 ones. About fifteen years later Fankhauser found the old 



1 De Bary (i). 



