SAI'ROI.KCNIA 63 



arrangeiiKTit is racemose the stalk is often so long as to obscure the 

 arrangement; spherical (when in racemes), elongated or harrei-shaped 

 in other arrangements; wail thin, a little yellowish, pits small, not numer- 

 ous; diameter 44-77,1 or ^o-j2ii. bioad by 50-971I long. Eggs 3 (rarely), 

 mostly 12-18, wall thick, clear yellow, 1 9.5-2 i[j.. Hypogynous anther- 

 idial cell always present, no other antheridia, and no other cells below it; 

 under small oogonia it is about 14.5x20;;., usually, however, about i7-20;x 

 broad by 24.5-68iJL long; fertiMzing tube (which is often absent) 5-iOyL 

 long, or up to as long as the antheridial cell, simple or branched. Conidia 

 abundant, spherical or elongated, and produced like the oogonia, except 

 that racemes are less distinct. The conversion of conidia into oogonia 

 is a common occurrence." 



14. Saprolegnia torulosa deBary. Beitr. zur Morph. und Phys. der Pilze, 

 IVReihe:3i, pi. 6, figs. 3-17. 1881. Also see Bot. Zeit. 46: 618. 

 1888. 



Saprolegnia sp. Lindstedt. Synopsis d. Saproleg., p. 48, pi. 4. 1872. 



This is reported by Humphrey from Massachusetts, New Hamp- 

 shire and Louisiana, but it is doubtful if he had the true species (see 

 remarks under Isoachlya toruloides). DeBary's description in Bot. 

 Zeitung is as follows: 



"Primary sporangia slender, cylindrical, claviform; oogonia irregu- 

 larly spherical, elongated, pyriform or cylindric, seldom egg-shaped, 

 almost alwa>s appearing in torulose rows of two to several by constric- 

 tion of the main hyphae; after ripening remaining firmly attached to 

 each other. Oogonial wall with few or no pits. Oospores centric. An- 

 theridial branches and antheridia usually completely absent. In the 

 rare cases where present either androgynous or diclinous. Antheridia 

 with or without a fertilizing tube. 



"Up to the formation of primary sporangia the species cannot be 

 distinguished from S. monoica. Later, as already fully described (Beitr. 

 1\', p. 102), the main l)ranches become divided by cross walls into struc- 

 tures, the outer of which occupy the position to be taken by the oogonia. 

 Between these initials the threads are constricted so as to appear toru- 

 lose. Such appearances are also not rare in old examples of other spe- 

 cies, as in the formation of the sporangial rows described by Pringsheim 

 and of resting cells [gemmae]. In the present species certain of these 

 structures become such sporangia and gemmae; others, however, in 

 special position and number become oogonia. and indeed the oogonia 

 here are almost entirely formed from such chained initials. Single 

 oogonia terminating the vegetative threads are occasional and such are 

 often ovate or pyriform. -Significant details are fully described in Beitr. 

 IV. 



"The species appears rare. F"ound in a stream near .Strassbourg 

 in .April, 1879, and cultivated until 1884. Also doubtfully seen in slime 

 from the Todtensee near the Grimsel." 



