110 THE SAPROLEGNIACE^ OP THE UNITED STATES, 



have never seen the intercalary barrel-shaped oogonia, said by that author to occur 

 sometimes. It should bear his name, but for the fact that that name had previously 

 been applied by Pringsheira ('60) to S. monoica attacked by Chytridiaceous para- 

 sites ; and this previous use of the name, although it can stand only as a synonym, 

 should debar its further use, in the interest of clearness and accuracy. The use of 

 the same name by Schroeter ('69) for apparently another species has been already 

 alluded to. It may be, as DeBary intimates ('88), that this species has been included 

 by some authors under the name S. dioica ; but there is not the least evidence that 

 the original author of that name even knew it. In order to change its name as little 

 as possible, and yet sufficiently, I propose for the species that of S. dwlina, which 

 refers to the same peculiarity as did the former one. 



An error which has been overlooked in reading the proof of Saccardo's Sylloge 

 ('88, p. 269) makes what is intended for S. dioica read S. divisa. The description 

 which follows refers to Pringsheim's pseudo-species, 



Saprolegma anisosj^ora DeBary ('88). 



111. : DeBary, '88, PI. IX, Fig. 4. 



This European species takes its name from the fact that its sporangia are of two 

 kinds, producing respectively large and small zoospores. These are said to agree per- 

 fectly in structure and development, but the larger are of about twice the diameter 

 of the smaller, which are like those of other species of Saprolegnia. The oogonial 

 walls are unpitted and the antheridia agree with those of 8. diclina in their form and 

 in their diclinous origin. This is the only known Saprolegnia which has excentric 

 oospores. DeBary well remarks that the. species deserves further study. 



Saprolegnia asterophora De Bary ('60). 



111. : DeBary, '60, PI. XX, Figs. 25-27. 

 DeBary, '81, PI. VI, Fig. 18-29. 

 PI. XVII, Figs. 54, 55. 



Hyphge slender, "with cylindric-clavate zoosporangia." Oogonia terminal, 

 globular, with several or many rather long, blunt outgrowths of the wall, giving it a 

 starlike appearance ; the wall unpitted. Antheridia " usually present," on branches 

 arising just below the oogonia from the oogonial branches, short-clavate, applied by 

 their ends. Oospores commonly single, sometimes two or rarely three, centric, thick- 

 walled, their diameter about 30//. 



