SArROI.F.CNIA 47 



(".rowth moilcratcly strong (not so lirlicato iind nioa> extensive 

 than in .S. dcliai), sporangia long, cylindrical, repeatedly proliferating, 

 spores lo- 1 2;x thick. Gemmae typically elongated rod-shaped, sausage- 

 shaped, pyriforni, or oval, not often spherical, usually in chains. Oogonia 

 spherical to oval, moderately plentiful (not nearly so abundant as in 

 5. delica), borne on short lateral stalks, or terminal, or rather infre- 

 (jucntly intercalary, with or without a conspicuous neck; wall not very 

 thick, about i.8yL, with numerous conspicuous pits (the small ones with 

 few) which are about 4.5-6.5,x in diameter; eggs centric, 20-30;! thick, 

 most about 24-25yL, often oval from pressure, 1-20, mostly 4^10, not so 

 numerous or so nearly filling the oogonium as is usual in S. ferax. An- 

 thcridial branches short, arising usually from main branches near the 

 oogonia and running to nearby oogonia cither on the same thread or on 

 others near, occurring on about 40% or more (not on all) of the oogonia 

 on flies or grubs. 



Found three or four times in Chapel Hill, as in Arboretum spring 

 (\o. I of November 2, 1916), and from Bowlin's Creek, under bridge 

 on Durham road (Nos. 7 and 8 of November 16, 1917). 



Occurrence in America (of the species in all reported forms) : Chapel 

 Hill. N. C, Hartsville, S. C, Mississippi, Pennsylvania, Louisiana, 

 Michigan. DeBary once found the species on sick fish (1888, p. 617). 

 For other illustrations see Humphrey, pi. 16, figs. 40-42; Minden ('12), 

 figs, id and li on p. 520. 



As will be seen from aboxe, our form agrees as well with deBary's 

 description as could be expected. Especially is this true in regard to 

 the rather few eggs which do not .so nearly fill the oogonium as usual 

 in S. ferax (but the latter also varies to similar oogonia). In our Nos. 7 

 and 8 of November 16, 191 7, the number of oogonia with antheridia 

 when grown on grubs was about 40%, while in No. i of November 2, 

 1916, the number was around 90%. 



Humphrey describes his plants as having antheridia "absent from 

 a part, sometimes from a large part of the oogonia." 



Kaufifman has found in Michigan a form of this species which he 

 cultivated in \arious media and has described as follows (Ann. Bot. 22: 

 367. 1908):* 



"Hyphae rather slender; zoosporangia nearly cylindrical. Oogonia 

 with rather thick walls, terminal, intercalary or lateral, flask-shaped, 

 rarely sjiherical, the lateral on short oogonial branches; pits medium 

 to large, rather numerous but not easily seen; antheridial branches usually 

 androgynous when the oogonium is lateral, diclinous when the oogonia 

 are terminal or intercalary, long and slender when diclinous, short and 

 slender and not coiled when androgynous; antheridia on 75 per cent to 

 90 per cent of the oogonia, long, subcylindrical, not very profuse on a 



•Also noted in .\nn. .Mich. .Acad. Sci. 8: 27. 1905. 



