NEW (EDOGONIACEiE. 



E. N. Transeau and Hanford Tiffany. 



The following forms of Oedogonium and Bulbochaete have 

 been found in collections from Illinois and Massachusetts and 

 are apparently undescribed. 



Oedogonium hystricinum nov. sp. 



Oedogonium dioicum, nannandrium, idioandrosporum; oogoniis singulis, 

 globosis vel suboboviformibus, poro mediano apertis; oosporis globosis vel sub- 

 globosis, oogonia fere complentibus; episporio brunneo, echinis subuliformibus 

 instructo; cellulis sufifultoriis tumidis; plantis masculis paullo gracilioribus quara 

 femineis; androsporangiis 3-G-cellularibus; cellula fili terminali obtusa; cellula 

 fili basaH elongata; nannandribus subrectis in cellulis suffultoriis sedentibus, 

 antheridio exteriore, unicellulari; 



Crassit. cell, plant fem. 8-15, altit. 42-100 



cell, plant masc. 6- 9, " 50- 67 



cell, suffult. 16-19, " 42- 70 



oogon. 30-40, " 36- 53 



oospor. (c. echin.) 23-38, " 28- 43 



cell, androsp. 6- 8, " 8- 15 



stip. nannandr. 6-10, " 20- 32 



cell, antherid. 5- 6, " 6- 10 



Dioecious, nannandrous, idioandrosporous, oogonia single, globose 

 or somewhat obovoid, pore median; oospores globose or subglobose, 

 nearly filling the oogonia, outer spore wall, brown, densely covered 

 with spines; suffultory cells swollen; male filaments smaller than the 

 female; androsporangia 3-6-celled; terminal cells obtuse; basal cells 

 elongated; dwarf males nearly straight resting on the suffultory cell, 

 antheridium exterior, one-celled; 



Diam. veg. cell, female plant 

 " " " male plant 



" suffult. 

 " " oogonia 

 " oospore (includ. spines) 

 " androsporangia 

 " stipe, dwarf males 

 " antheridia 



This species is near Oe. Hystrix Wittr. but differs in the 

 small diameter of the filaments in proportion to their length 

 and the size of the oogonia. The suffultory cells are swollen 

 and the androsporangia are much smaller. 



Collected from a temporary pond at the West end of Polk 

 St., Charleston, Illinois, May, 1914. Type in herbarium. 

 E. N. T. Collections. No. 2310, 2364. (Plate XIV, Figs, f-i.) 



240 



