THE GREEN ALGAE OF NORTH AMERICA 71 



93. OE. RUGULOSUM Nordstedt ex Him, 1900, p. 241, PI. 

 XL, fig. 249; Transeau, 1917, p. 231. Dioecious, nannan- 

 drous ; oogonia single or 2, oboviform or oboviform-ellipsoid, 

 very rarely oviform, operculate ; division superior ; oospore 

 ellipsoid, nearly filling the oogonium, rarely globose-ellipsoid 

 and then not filling the oogonium (membrane sometimes very 

 finely crenulate) suffultory cell not swollen ; dwarf males on 

 oogonium or near it ; antheridium exterior, i (-?)-celled, curved. 



veg. cell, 4.5-8 n diam., 2.5-5 diam. long, 



oog., 16-20 fj. " 22-29 /i long, 



oos., 15-18^1 " 19-23 AC " 



anth. cell, 4-6 /u " 5-6 /* " 



nan. cell, 5-7 n " 11-14/1 " 



New Buffalo, Mich., Transeau. Europe. 



Page 275, after account of BULBOCHAETE minor, add, 



OEDOCLADIUM Stahl ex Hirn, 1900, p. 374. 

 Terrestrial, branching, partly subterranean and subhyaline, 

 partly above ground and green ; vegetative cells cylindrical, 

 growth chiefly by division of terminal cell of a filament or of a 

 branch ; oogonia arising by simple division of a vegetative cell. 

 O. albemarlense I. F. Lewis in litt. Monoicum, oogoniis 

 singulis, plerumque terminalibus, subglobosis, apice conica, 

 poro inferiore apertis, membrana levi, oosporis globosis, oogo- 

 nium non complentibus, episporio levi, mesosporio scrobiculato 

 (in sectione optica undulato) endosporio levi ; antheridiis ad 

 9-cellularibus ; cellulis vegetativis subcylindricis, cellula ter- 

 minali apice conica. 



Monoecious, oogonia single, mostly terminal, subglobose with 

 conical apex, pore inferior, membrane smooth ; oospore globose, 

 not filling the oogonium; epispore smooth, mesospore scrobicu- 

 late (in optical section undulate) endospore smooth ; antheridia 

 to 9-celled ; vegetative cells subcylindrical, terminal cell with 

 conical apex. Fig. 22. 



On sandy loam, bank of the Rivanna above the woolen mill 

 near Charlottesville, Albemarle County, Virginia, Oct. -Dec., 

 1916, I. F. Lewis. Type deposited in the herbarium of the 

 Cryptogamic Laboratory, Harvard Univeraity. 



veg. cell, superterranean, 25-40 n diam., 50-150 /* long, 

 veg. cell, subterranean, n M " -35^ ' 



oog., 90 M " 95 M " 



oos., 69 M " 69 M ' 



anth. cell, 20-15 M " 8-19 M " 



