20 MINNESOTA BOTANICAL STUDIES. 



Mem. de la Soc. de Cherbourg, 20: 109-144. 1876; Bornet, 

 E., and Thuret, G., Etudes Phycologiques, 63, Plate 32 , 1878; 

 Wille, N., Die Befruchtung von Nemalion muliifidum (Web. 

 and Mohr) J. Ag., Berichte der Deut. Bot. Ges. 12: (57). 

 1894.) In Nemalion multifidum Wille (7. c.) traced the pas- 

 sage of the male nucleus down into the carpogonial cell, and its 

 fusion with the nucleus of the latter. 



Schmitz and Hauptfleisch (Schmitz, Fr., and Hauptfleisch, P., 

 Helmenthocladiaceae, in Engler and Prantl, Die Natiirlichen 

 Pflanzenfamilien) in their classification of the Nemalieas lay 

 stress on the position of the carpogonial branch, whether it is 

 terminal on one of the younger cortical filaments, or borne 

 laterally upon one of the intermediate cells of a cortical filament. 

 In this they are followed by De Toni. (De Toni, J. B., Sylloge 

 Algarum, 12 : 76. 1897.) In the first class they place Nemalion 

 and Trichoglcea, and in the second class Helminthocladia and 

 Liagora. It is to be noted that, while the procarp appears 

 terminal in Trickogl&a lubrica, it is borne only on one of the 

 secondary filaments, which are themselves of lateral origin, and 

 hence the difference in this case is rather that the carpogonial 

 branch in Trichoglcea is long, approaching the length of the 

 sterile cortical filaments, while \n Liagora and. its allies the car- 

 pogonial branch is very short, and hence the procarp is almost 

 sessile. Whether the apparently terminal procarp of Nemalion 

 is to be similarly interpreted, can be determined only by ob- 

 servation. 



It has been noted that in Trichogloea lubrica there is a rudi- 

 mentary pericarp. In Nemalion the cystocarp is naked, while 

 in the other genera of the Nemalieae there is an abundant peri- 

 carp, often produced by outgrowths from the primary cortical 

 filament upon which the carpogonial branch stands. 



It will thus be seen that in the structure of the vegetative tract 

 Trichogloea lubrica agrees very closely with the genus Liagora, 

 while in the reproductive tract (and especially in the structure 

 of the cystocarps), it most nearly resembles Nemalion, holding, 

 however, in some respects a position intermediate between 

 Nemalion and the three genera, Liagora, Helminthocladia and 

 Helminthora. 



