OEDOGONIUM 165 
The cell diameter is extremely variable. The echinate 
appearance of the oospore is questioned by Hirn (1906), who 
thinks the oospore may be parasitized. _ 
213. Oc. pilosporum West. 
(Pl. XL, fig. 395.) 
1891, p. 109, Pl. 18, fig. 3; Hirn 1900, p. 318, Pl. L, fig. 325. 
Oogonium single, oblong-ellipsoid, somewhat narrowed at the upper 
extremity; oospore subglobose, spore wall thick and outer layer densely 
pilose, the hairs short; vegetative cell 11-12 55-70; oogonium 23 x 48y; 
oospore (without hairs) 19X21u; oospore wall 2u thick. 
Spain. 
The above dimensions and description are copied gingerly 
by Hirn (1900). From West’s figure one is inclined to agree 
with Hirn that the ‘‘oospore’’ may be nothing more than a 
fungal parasite within the oogonium. 
214. Oe. hoehnei Borge. 
(Pl. XXVIII, fig. 251.) 
19255 pel2jeelel fies le 
(?) Dioecious, macrandrous; oogonium single, ellipsoid, pore super- 
ior; oospore globose, not filling oogonium in length, outer spore wall 
smooth, middle wall areolate; vegetative cell 43-44 X 148-240u; oogon- 
ium 66-72 99-108; oospore 63-65 X 63-65u. E 
Paraguay. 
This species has spore markings similar to those of Oe. 
areolatum (No. 59). 
215. Oe. giganteum Kuetzing; Wittrock. 
(Pl. XXIX, fig. 260.) 
Kuetz. 1845, p. 200; 1853, p. 12, Pl. 37, fig. 2; Wittr. 1874, p. 42; Hirn 1900, p. 295, 
Pi Sea, fis: 115: 
(?) Dioecious, macrandrous; oogonium 1, cylindric-obovoid, pore 
superior; oospore cylindric-ellipsoid or subellipsoid, nearly filling 
oogonium, spore wall in three layers: outer smooth, middle layer with 
25-30 longitudinal rows of pits, inner layer smooth; vegetative cell 
30-50 X 60-225y; suffultory cell 40-6060-210u; oogonium 53-69 
67—106u; oospore 51-65 X 65-103. 
United States: Ohio; Austria, England, Denmark, Germany, 
Sweden. 
This species is rather readily identified by its large size and 
by the longitudinal rows of distinct pits in the middle layer of 
the oospore wall. It is separable from Oe. capense (No. 216) 
by its larger size. The arrangement of pits and general appear- 
ance are somewhat similar to the nannandrous Oe. concatenatum 
