WITH NOTES ON OTHER SPECIES, 105 



helix of one or two turns. It is of doubtful autonomy, but, in the absence of fuller 

 knowledge, may be allowed to stand for the present; although it would hardly appear 

 to be entitled to more than varietal rank, if well marked. 



Sapbolegnia mixta DeBary ('83). 



Sya. : S.ferax Auct. p. p. III. : PL XVI, Figs. 4O-42. 



/S. /eraa; Schroeter ('86). 

 8. dioica Scliroeter ('69). 



Hyphse rather slender, not long. Zoosporangia cylindric-clavate. Oogonia ter- 

 minal or rarely intercalary, on main jQlaments or lateral branches, globular, with 

 numerous pits of varying size, but often pretty large. Antheridia cylindrical, rather 

 shorter and smaller than in S. monoica, of androgynous or diclinous origin, absent 

 from a part of the oogonia, sometimes from a large part. Oospores up to fif- 

 teen or occasionally more than twice that number, centric, their average diameter 

 about 26;j.. 



Pennsylvania — Philadelphia, Keller.- Mississippi — Starkville, White: Louisiana 

 — Bayou Tortue, Langlois. Europe. 



I have not yet with certainty recognized this species in Amherst cultures, but 

 have received it from three sources ; which indicates that it is widely distributed and 

 not uncommon. The materials for two of the cultures containing it were taken from 

 small pools, while the third and most abundant specimen came from Algse and Lem- 

 n(E growing in Bayou Tortue, near St. Martinville, La. 



The species is rather vague and unsatisfactorily defined, as DeBary has 

 remarked ('88). It is intermediate in several respects between 8. monoica and 8. 

 ferax, and might seem to afford ground for regarding all these as forms of a single 

 species, as Pringsheim does. Having found 8. monoica and 8. ferax to be well 

 marked and constant before meeting with this species, I was for some time skeptical 

 concerning it, thinking it might have originated in a mixture of those two. But the 

 receipt of material from distinct sources which could be referred to neither of those, 

 and which shows constantly the characters above stated, in successive generations, 

 has convinced me that the species is well founded and appropriately named. The 

 smaller and less abundant antheridia, not always of androgynous origin, and the 

 usually less numerous and less conspicuous pits of the oogonial wall chiefly distin- 



