428 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



12. V. LONGIPES Collins, 1907, p. 201, PL LXXVI, fig. i. 

 Filaments 80-90 p. diam., oogonia and antheridia borne at the 

 end of a branch one to several mm. long, 30-40 //, diam. ; antheri- 

 dium terminal, cylindrical or slightly tapering, hooked or cir- 

 cinate ; oogonia 70-85X35-40 /A, ovoid, slightly oblique, 2-4, on 

 pedicels 20-30 /* diam., 100-150 p. long, arising a little below the 

 antheridium, and usually surpassing it. In brooks and pools. 

 Cal. 



Somewhat resembling V. geminata, but distinct by the very 

 long fruiting branches, at right angles to the filaments, as well 

 as by the longer pedicels of the oogonia. 



13. V. GARDNERI Collins, 1907. p. 201, PI. LXXVI, figs. 

 2 and 3 ; P. B.-A., No. 1288. Filaments 50-70/11 diam., sparingly 

 branched, branches mostly at right angles ; antheridia and 

 oogonia borne on pedicels of about the same size, 60-100 /j. long, 

 15-20 fi diam., arising from the same point on the filament ; 

 antheridium solitary, terminal on the central, vertical pedicel, 

 less commonly 2 or 3 on independent pedicels, hooked or cir- 

 cinate, tapering to 10 p. diam. ; oogonia 2-4, occasionally more, 

 85-95X60-70^, quite oblique, often concave on the inner side, 

 on opposite sides of the antheridium or encircling it, their pedi- 

 cels at about 45 degrees to the filament ; usually surpassing the 

 antheridium. In brooks and pools. Fig. 153. Cal. 



In general arrangement like V. longipes, but the pedicels 

 bearing the organs of fructification are placed directly on the 

 filament, radiating from one spot ; the oogonia are much more 

 oblique, often concave inside. 



Forma TENUIS Collins, 1907, p. 201. Filaments 30-40/0, diam. ; 

 antheridia often more numerous than the oogonia ; oogonia 

 sometimes single. With the type. Cal. 



When in this species two oogonia occur with one antheridium, 

 there is a certain resemblance to V. geminata ; but the slender 

 radiate pedicels make it amply distinct ; the forms with many 

 oogonia and antheridia are quite unlike anything else. The 

 largest number of pedicels observed in a grdup is 12, four bear- 

 ing antheridia, eight oogonia. 



ment e"chancree a 1'interieur." Figures 43 and 44, V. racemosa, have 

 spores quite like this description. The filaments of E. geminata, accord- 

 ing to Vaucher, are about half the size of those of E. sessilis ; while 

 according to Gb'tz the two species are of about the same size, V. geminata 

 slightly larger. There is no indication in the descriptions and figures of 

 Vaucher and Hassall of the lateral prolongations of the antheridium 

 characteristic of Gb'tz' plant. If the latter were to be identified with any 

 of Vaucher's species, E: cm-data seems more probable than E. geminata, 

 except that it is said to be quite small in all of its dimensions. 



