Otdogonieæ Americanae, hucusque cognitae. 
137 
10. Oe. Wolleanum Wittr. in Rab. Alg. Eur. n:o 
2547. Exs. Wittr. & Nordst. Alg. aq. clulc. exsic. fasc. 
3. n:o 107. 
Oe. clioicum nannandrium, gynandrosporum ; oogoniis 
singulis vel binis (raro ternis vel quaternis) ovoideis, poro 
foecundationis in parte superiore oogonii sito; membrana 
oogoniorum post foecundationem incrassato et longitudina- 
liter costato; oosporis oogonia plane explentibus; cellulis 
suffultoriis tumidis; cellula terminali (quæ non raro est 
oogonium) obtusa; androsporangiis subepigynis vel in parte 
superiore ffli sparsis; nannandribus in cellulis suffultoriis 
sedentibus, tricellularibus, stipite paullum curvato, sper- 
mogonio exteriore bicellulari; 
crassit. cell, veget, trivial. 21—30 p, altit. 3—7plo majore; 
5 5 
., suftultor. 
45—52 ,, 
55 
78 — 90 p ; 
55 
oogon. 
52—60 „ 
55 
69—78 „ 
55 
oospor. 
47—55 „ 
55 
65—70 „ 
55 
cell, androsporang. 21—24 „ 
55 
18-25 „ 
55 
stip. nannandr. 
15—18 „ 
55 
54—60 „ 
55 
cell, spermogon. 
9-11 „ 
55 
11 „. 
Hab. in Pennsylvania ad Bethlehem, ubi legit rev. 
F. Wolle. D:r L. Rabenhorst plantam mihi benevole 
communicavit. 
This species has its place between Oe. Borisianum 
(Le Cl.) Wittr. and Oe. concatenatum (Hass.) Wittr., but 
is well distinguished from both, among other things through 
the fact that the effect of the fecundation extends not 
only to the oosphere but also to the wall of the oogonium. 
This wall increases in thickness after the fecundation, 
receiving at the same time longitudinal costæ on its in¬ 
ner side. 
11. Oe. echinatum (Wood) Wittr. Syn. Androgynia 
echinata Wood in Smithson. Contrib. to Knowl., vol. 19. 
Oe. dioicum, nannandrium; oogoniis globosis, plerum¬ 
que depressis, poro foecundationis in superiore parte oogo¬ 
nii sito; oosporis oogonia fere complentibus, exosporio acu- 
