170 HISTORY OF BOTANY 



Sporangia, quite a library of monographs appeared on 

 the anatomy of individual genera or on special organs. 

 Even to mention the contents of these in the briefest 

 possible manner would occupy time out of all proportion 

 to what I may legitimately allow myself, and at the same 

 time maintain some sort of balance among the variety of 

 subjects I have to bring to your notice. I must, however, 

 mention a few of these works, if ever so briefly. There 

 are, for instance, the researches on the anatomy of the 

 Ophioglossaceae by Prantl, Farmer and Freeman, Russow, 

 Jeffrey, and Campbell ; on various genera of the Marat- 

 tiaceae by Farmer, Campbell, and Luerssen ; on the 

 Osmundaceae by Prantl and Kny, and on theGleicheniaceae 

 and Schizaeaceae and on the Hymenophyllaceae by 

 Poirault, Prantl, and Goebel. The group long known as 

 Rhizocarpeae, from the supposed origin of the sporocarps 

 from their roots, was completely investigated not only 

 by Hofmeister and Pringsheim but also by Prantl, 

 Russow, Hanstein, Strasburger, Belajeff, Campbell, and 

 others, with the result that these peculiar aquatic Pterido- 

 phytes were shown to be ferns, and renamed Hydro- 

 pteridae, while the pronounced heterospory exhibited by 

 them turned out to be a case of parallel development in 

 the fern series analogous to, but in no way connected 

 with, the corresponding phenomenon in the Lycopodinae. 

 In the Lycopodinae also much important work was 

 accomplished on the prothallus and gametes by Millardet, 

 Mettenius, Belajeff, Bertrand, Pfeffer, and Campbell, 

 but especially by Treub and Bruchmann, while the 

 vegetative organs of the sporophyte were investigated 

 by Strasburger, Solms Laubacn, Goebel, and others. 

 Isoetes was dealt with in great detail by Russow, and 

 later by Farmer and Campbell, while the Equisetaceae 

 had many points in their anatomy and development 

 cleared up by the researches of Pfitzer, Famintzin, Van 

 Tieghem, Cormack, and Jeffrey. Similarly the anatomy 

 of the genus Selaginella was worked out to some extent 



