884 AQUATIC PHYCOMYCETES 



Sapromyces differs from Araiospora in the less pronounced, more 

 slender basal cell, in forming only smooth sporangia, and in the fact 

 that the oospore lacks a cellular envelope of periplasmic origin. 



KEY TO THE SPECIES OF SAPROMYCES 



Antheridia diclinous S. elongatus, p. 884 



Antheridia androgynous S. androgynus, p. 886 



Sapromyces elongatus (Cornu) Coker 



N. A. Flora, 2 (1): 62. 1937 



(Fig. 70 B, p. 890) 



Rhipidium elongation Cornu, Ann. Sci. Nat. Bot., V, 15: 15.1872. 

 Naegelia sp., "I" (and "II"?) Reinsch, Jahrb. wiss. Bot., 11: 298, pi. 15, 



figs. 1-6. 1878. 

 Naegeliella reinschii Schroeter, in Engler and Prantl, Naturlichen Pflanzen- 



fam., 1(1): 103. 1893. 

 Sapromyces reinschii (Schroeter) K. Fritsch, Osterr. botan. Zeitschr., 43: 



421. 1893. 



Basal cell slender or somewhat distorted, 300-1200 u, long, including 

 the branched holdfasts, by 15-30 \x in diameter, the apical cylindrical 

 or narrowly clavate secondary axes more slender, constricted and 

 septate at their point of origin, 8-25 \x in diameter and up to 620 u. in 

 length, giving rise distally to from one to several successively narrower 

 segments which may further branch at their apices; sporangia pedicel- 

 late, borne singly or in whorls of from two to six at the tips of the branch- 

 es or at the constrictions, subcylindrical, subclavate, ovoid or ellip- 

 soidal, 35-200 \x long by 10-30 u. in diameter; zoospores reniform, 

 8-10 \x in diameter, laterally biflagellate ; antheridium swollen and 

 irregularly clavate, appressed along its whole length or only by its apex 

 to the upper part of the oogonium, borne on a slender often tortuous 

 branched or unbranched long hypha of diclinous origin, 8-12 by 40-65 

 u.; oogonium spherical, subspherical, or pyriform, 32-63 [J. high by 

 26-40 ;jl in diameter, pedicellate, borne terminally or laterally, the outer 

 wall with age often exhibiting a biownish transversely disposed incrus- 

 tation; oospore not filling the oogonium, spherical, 20-34 \x in diameter, 

 yellowish to brownish, the thick wall with a slightly uneven outer 

 surface, germination not observed. 



