THE GREEN ALGAE OP NORTH AMERICA 25 



assigned to these two species would now be assigned to one of 

 the newer species. 



4. V. GLOBATOR Ivinnaeus, 1758, p. 320; Ehrenberg, 1838, 

 p. 68, PI. IV, fig. i. Colonies spherical, monoecious and 

 usually proterandrous, 600-800 ft diam., of 3,000-20,000 cells, 

 2-3 p. diam., with cytoplasmic connections; parthenogonidia 

 to the number of 8 in a colony, about 50 ft diam. : oogonia 20- 

 40 in a colony, about 50 ft diam., wall with stellate projections ; 

 antheridia seldom over 5 in a colony, discoid, 35-40 ft diam., 

 antherozoids numerous, 5-6 ft long. Europe. 



5. V. PERGLOBATOR Powers, 1908, p. 162. Colonies spher- 

 ical, 900-1500 ft diam., dioecious, mostly trioecious ; vegetative 

 cells in mature colonies more distant than in other species, but 

 with distinct protoplasmic connections ; oogonia stellate ; 

 antherozoids united in large numbers to form hollow spheres 

 "globoids", soon becoming flattened, poles differentiated ; re- 

 productive bodies of all kinds numerous in a colony, from 40 to 

 300. Mass., Me., Mich., Neb., La. 



Powers' description of this species is less full than the descrip- 

 tions of the two others, and there are no plates; in material 

 from Fenway Park, Boston, Mass., which seems to belong to 

 this species, the number of reproductive bodies was less than 

 that given by Powers, but much more than that characteristic 

 of V. globator, the only species of the same habit and order of 

 magnitude ; the oogonia and antheridia were in distinct colo- 

 nies, the former about 60 ft diam. ; the latter 40-50 p. diam.; 

 mature colonies ranged from 800 to 1200 ft diam. 



Page 138, add note, 



INEFPIGIATA has proved to be a state of Botryococcus Braunii. 



Page 140, add note, 



Lemmermann, 1915, unites the genera PALMODICTYON and 

 PALMODACTYLON under the former name, with two species, 

 PALMODICTYON VIRIDE Kiitz. and P. VARIUM (Nag.) Lem- 

 mermann. The change seems justified. 



Page 146, CHLOROCHYTRIUM, for "biciliate zoospores" read 

 " biciliate or quadriciliate zoospores." For Key to the Species 

 of Chlorochytrinm, substitute, 



i. In fresh water phanerogams. 2. 



i. In algae. 3- 



2. A prolongation of the cell wall remaining where the zygote entered 

 the host, Lemna trisulca. C. Lemnae. 



