Oedogonieæ American», hucusque cognitæ. 
135 
„ cell, androsp. 21 —24 ,, „ 16—21 q; 
„ nannandr. 15—17 „ „ 66—75 „. 
Hab. in Mexico ad Vera Cruz, ubi cel. F. Müller 
legit 18J53; sec. specimina in museo botanico universitatis 
Argentoratensis asservata. 
7. Oe. multisporum Wood. Prodr. of Freshw. Algæ 
of East. N. Amer., pag. 141. 
Oe. dioicum, nannandrium; oogoniis singulis vel binis 
vel ternis, globosis; poro foecundationis in parte superiore 
oogonii sito; oosporis oogonia explentibus, exosporio lævi; 
cellulis suffultoriis forma eadem ac cellulis vegetativis 
ceteris; nannandribus in partibus quibuscumque plantæ 
femineæ sedentibus, stipite curvato, spermogonio exteriore; 
crassitudine cellularum vegetativarum c:a 14 altitudine 
1 1 / 4 —1 3 / 4 plo majore; diametro oogonii c:a 34 /u. 
Hab. in Pennsylvania in stagnis prope Philadelphia; 
sec. Prof. H. C. Wood. 
The above diagnose I have written according to the 
description given in the treatise of Wood quoted above, 
compared to the figures which the same author has given 
in Smithsonian Contributions to Knowledge, vol. 19. — 
The species is most nearly related to Oe. irregulare Wittr., 
from which it differs by its oogonia, which are most fre¬ 
quently placed in rows, by having a more slender growth, 
comparatively shorter vegetative cells, and the foot-cell 
of the dwarf male-plants curved (not straight). 
8. Oe. lætevirens Wittr. in Warming Symbolæ ad 
Flor. Brasil, cognoscend. XXII. Alg. Brasil, auct. G. 
Zeller. 
Oe. dioicum nannandrium, idioandrosporum (?) ; oogo¬ 
niis singulis, raro binis, globosis, operculo apertis, rima 
angusta; oosporis globosis vel subdepresso-globosis, oogonia 
complentibus, exosporio lævi; cellulis suffultoriis eadem 
forma ac cellulis vegetativis ceteris; nannandribus in oogo¬ 
niis sedentibus, stipite paullum curvato, spermogonio exte¬ 
riore, unicellulari; 
9 * 
