74 THE SAPROLEGXIACEAE 



form V, of Minden (1912, p. 523). By all means this complicated and 

 often unclear systematic situation summons one (as was the opinion 

 of deBary) to investigate again the extent of variability of the species 

 of the Saprolegniaceae. The diagnosis of the species follows: 



"Turf delicate, extending 1-2 cm. on a fly; hyphae slender, straight, 

 sparingly branched, 8-1411. thick; zoosporangia slightly greater in diam- 

 eter than the hyphae, terminal; antheridia absent; oogonia lateral, borne 

 on a short stalk or sessile, a tube-like growth from the oogonial stalk 

 often proliferating up into the oogonium; diameter of oogonia 45-75iA; 

 pits distinct, of unequal frequency (6-18 in oogonia on same hypha) ; 

 eggs globose or broadly ellipsoid, tawny-colored, 19-31^1, usually 2 i-24ix, 

 in diameter, 1-18 in each oogonium." 



Saprolegnia mixta var. Asplundii Gaumann. Botaniska Notiser, p. 



155. 1918. 



This is said to differ from the typical form (in the sense of Maurizio, 

 1895) only in the smaller oospores, which vary from i5-2i;a., mostly 

 l6-i9iA, thick (no figures). 



Saprolegnia floccosa Maurizio. Mitt. d. Deutsch. Fischerei-Vereins 7: 

 50, figs. 16 and 17. 1899. 



The following is a translation from the original, complete except 

 for the omission of a few unimportant words: 



"This species, like 5. paradoxa, was isolated from eggs of the Amer- 

 ican brook trout at Munchhausen hatchery, in the winter of 1895. Cul- 

 tivated for i>^ years. Turf very dehcate, and 1.5-2 cm. long. It spreads 

 out and floats in a flocculent manner on the water. This quality sug- 

 gested the name. Sporangia growing through as usual, and not peculiar. 

 Oogonia in racemes or intercalary; there also occur sympodia of a few 

 oogonia; spherical, only the intercalary and terminal ones are elongated 

 or barrel-shaped : the flattened or angular appearance of small oogonia 

 I attribute to the sharply projecting pits. The mostly short oogonial 

 stalks are contracted at the base; they are straight or a little bent, never 

 wound; membrane only moderately thick; small projections enter the 

 oogonia from below; pits numerous, small, sharply springing outward, 

 to this fact is due the angles and depressions of the oogonia; diameter 

 45.5-73[x. Eggs 1-15, usually 4-9, wall thin, diameter 24-25. 6;i.. An- 

 theridia on about three-quarters of the oogonia, arising from their stalks 

 or from the hyphae near them, thickly applied to the oogonia. Conidia 

 [meaning gemmae] present, in chains or complicated, often also more 

 or less racemose with the oogonia, therefore they may be considered 

 the original fruit-form from which the oogonia sprang, often with a 

 slender projection; form various, e.g., often narrow in a thread-like way. 

 In the system the species falls in the Fera.x group and also approaches 

 in many points S. dioica. It is distinguished from it by the racemose 

 oogonia and by the androgynous antheridia. Eggs somewhat smaller 

 than in 5. dioica. The diameter of the oogonia agrees pretty well with 



