138 T EOF D-OGON LACE AE 
The only nannandrous species with echinate oospores and 
inferior position of the oogonial pore. 
154. Oe. cleveanum Wittrock. 
(Pl. XLVI, figs. 443 and 444.) 
1870, p. 128; 1872a, p. 22; 1874, p. 28; Oe. echinospermum Al. Br. in Pringsh. 
1858, p. 70, Pl. 5, fig. 7; Oe. berolinense Wittr. 1872, p. 6; Oe. cleveanum Wittr. var. 
arvensis Istvanffi 1887, p. 242; Hirn 1900, p. 209, Pl. XX XV, fig. 214; Oe. cleveanum 
Wittr. f. exoticum Hirn 1900, p. 210 (not Hirn 1906, p. 33). 
Dioecious, nannandrous, gynandrosporous; oogonium 1, subobovoid- 
globose or subglobose, pore inferior; oospore globose, filling oogonium, 
outer layer of spore wall dentate, teeth in 4—6 spiral rows, anastomosate; 
suffultory cell sometimes tumid; androsporangium 1-7; dwarf male a 
little curved, on suffultory cell, antheridium exterior, 1; vegetative cell 
(14—) 18-25 40-110u; oogonium 45-60 48-63u; oospore (with teeth) 
44-57 X 45-594; androsporangium 18-229-18u; dwarf male stipe 
10-11 X 29-32u; antheridium 5-9 X 12-16n. 
England, France, Germany, Hungary, Sweden; Brazil. 
154a. Form exoticum Hirn. 
1906, p. 33, (not 1900, p. 210); Schmidle 1901, p. 344. 
Oogonium 1-3; vegetative cell 14-25 44—200u; oogonium 39-46 x 
40-47; oospore (with teeth) 38-44 38—-44u; dwarf male stipe 10-11 
27-30y; antheridium 6-7 X 11-13. 
Caroline Islands. 
Oe. cleveanum is characterized by the inferior position of 
the oogonial pore and the dentate oospore, the teeth being 
arranged somewhat spirally. The form exoticum as described 
by Hirn (1900) is so nearly identical with the species as to be 
untenable even as a form. The specimens from the Caroline 
Islands referred to f. exoticum by Schmidle (1901) and Hirn 
(1906) have distinctly smaller oogonia and oospores and are 
thus perfectly tenable. 
155. Oc. elegans West and West. 
(Pl. LIT, figs. 498 and 499.) 
19025 pe 12S RIPE tess O=/-kliten! L906. ps loads Via tien 22. 
Dioecious, nannandrous; oogonium 1, depressed-globose, operculate, 
division median; oospore depressed-globose, quite filling oogonium, 
spore wall smooth; dwarf male small, unicellular, on oogonium; vegeta- 
tive cell densely and minutely granulate, the deposits spirally arranged; 
vegetative cell 6-9 X 25-85yu; oogonium 27-31 X 25-26u; oospore 25-28 X 
18-19u; dwarf male 5-6 * 8—9u. ° 
Ceylon. 
The only nannandrous member of the genus with granulate 
vegetative cells. Cf. Oe. minus (No. 84). 
