No. 503] NOTES AND LITERATURE 



741 



Hon actually seen in the 'Selago' type may bt held as truly 

 primitive, and Lycopodiinn Sclauo, with its im pi rfi ctl // diffi r- 

 eniiated shoot, is in fact a mar approach in a living sp<ci< s to the 

 ideal primitive form which emerges from with comparative study 

 of the phylum as a whole." 



"The functionally identical parts designated sporangiophores 

 and sporangia arc coynatc parts; it appears probable that the 



type of spore-producing member, of which thi sporangium of 

 Lycopodium is an example, while th< trabecula in Isoetes and 

 Lepidostrobus Brownii suyg<sf a mod, of origin of the septate 

 state. If this were so, then the sporangiophore would have been 

 distinct in its phyletic origin from the bract-leaves, which 

 habitually subtend the spore-producing members, whether they 

 he sporangia or sporangiophores." 



"The phyletic relationship of thi Sphi nophyllales and Equise- 

 tales has undoubtedly been a very close one: tlx distinguishing 



of the shoot, so much as in thi secondary modifications of number 

 and relation of tht appendages, and of their branching, together 



phoric Pteridophytt s const it at, a brush of naturally relaftd 

 phylt tic lines." 



The Ophioglossales are regarded as an ascending series of 

 forms the "spiki illustrating various st< ps in thi incn using com- 

 plexity of a body of the nature of the sporangiophore." "The 

 whole unbranched shoot is a single stmlnlus hairing leaves of 

 which all are potentially fertile and the majority actually so." 



