128 THE OE DOGONTAGE AE 
138. Oc. borisianum (Le Clerc) Wittrock. 
(Pl. XLVIII, fig. 469.) 
1874, p. 25: Prolifera borisiana Le Clerc 1817, p. 475, Pl. 23, fig. 6; Oc. borisianum 
Wittr. 1870, p. 182; Vesiculifera aurea Hassall 1842, p. 392; V. borisstz Hassall 1845, 
p- 201, Pl. 52, fig. 7; Oe. apophysatum Al. Braun in Kuetzing 1849, p. 366, and 1853, 
p. 12, Pl. 35, fig. 5; Oe. setigerum Vaupell 1859, p. 17, Pl. 1. (2) Androgynia mirabilis 
Wood 1872, p. 196, Pl. 18, fig. 2; Oe. birmanicum Wittrock 1874, p. 24; Hirn 1900, 
p. 217, Pl. XXXVI, fig. 223; Collins 1909, p. 255; Heering 1914, p. 178, fig. 243; 
Tiffany 1926, p. 103, Pl. VIII, fig. 87; P. B: A. No. 517. 
Dioecious, nannandrous, gynandrosporous or idioandrosporous; 
oogonium 1—5, obovoid or quadrangular-ellipsoid, pore superior; oospore 
ovoid to obovoid (often quadrangular-ovoid), not filling oogonium, 
spore wall smooth; androsporangium 1-7, usually in the upper part of 
the filament; basal cell elongate; terminal cell, often an oogonium, 
broadly apiculate, obtuse, or sometimes setiferous; dwarf male, some- 
what curved, on suffultory cell; antheridium 2; vegetative cell 15-23 x 
45-140u; suffultory cell 31-88 x 50-92y; oogonium (33-) 40-50 55—90u; 
oospore 35-46 X48-60u; androsporangium 16-19 X 15-234; dwarf male 
stipe 12-18 X 35-47; antheriditum 7-10 X 11-16n. 
United States: Iowa, Massachusetts, Utah, Michigan, Cali- 
fornia, Illinois, Ohio, Pennsylvania; British Columbia; Austria, 
England, Denmark, Finland, France, Germany, Spain, Sweden, 
Latvia; Brazil, Columbia, Paraguay; Australia; India; South 
Africa. 
138a. Var. westii Tiffany and Brown. 
(Pl. XLVIII, fig. 470.) 
In Tiffany, 1929, p. 74; Oe. borisianum (Le Cl.) Wittr. in West 1903, p. 36. 
Larger dimensions throughout; vegetative cell 17-19 X 130-180y; 
suffultory cell 31-42 105-168u;. oogonium 53-60X67-88u; oospore. 
49-58 X49-58u; antheridium 17X12-13p. 
United States: Michigan, Mississippi; England. 
Oe. borisianum is one of the commonest nannandrous 
species. It is easily identified by the striking difference in 
size between the cells above the oogonia and the suffultory 
cells. F. westiz is larger than the type. 
139. Oe. alternans Wittrock and Lundell. 
(Pl. XLVITII, fig. 463.) 
In Wittr. 1874, pp. 20; Hirn 1900, p. 251, Pl. XLIT, fig. 263. 
Dioecious, nannandrous, gynandrosporous; oogonium 1, subglobose, 
often alternating with vegetative cell, pore superior; oospore globose, 
filling oogonium, wall smooth, often thick; suffultory cell often sub- 
tumid; androsporangium 1-2, subepigynous or epigynous; basal cell 
elongate; terminal cell obtuse; dwarf male oblong, with an inferior 
constriction, on suffultory cell; vegetative cell 21-35 45-160u; sufful- 
tory cell 26-40 52-160yu; oogonium 65-80X65—-86u,; oospore 59-75 X 
59-75; androsporangium 18-25X16-25y; dwarf male 12-17 X38—46u. 
