CHYTRIDIALES 305 



? Rhizophydium oedogonii Richter 



Bibliotheca Botan., 42: 12, fig. 6. 1897 



Sporangia in groups, sessile, somewhat irregularly ellipsoidal with 



outgrowths which result in a spherical-tetrahedral shape, at maturity 



bearing two lateral opposite spines, breadth from spine to spine 28 \x, 



thickness 14 — 1 7 jjl ; other features not observed. 



On filaments of Oedogonium sp. (preserved material), Greenland. 



? Rhizophydium sporoctonum (Braun) Berlese and de Toni 



Saccardo, Sylloge fungorum, 7: 299. 1888; emend. Scherffd, Arch. Protistenk., 



54: 222, pi. 10, figs. 96-97. 1926 



Chytridium sporoctonum Braun, Monatsber. Berlin Akad., 1855: 381; Ab- 

 handl. Berlin Akad., 1855: 39, pi. 2, fig. 13. 1856. 



Sporangium sessile, spherical, 7 ;jl in diameter, wall smooth, thin; 

 rhizoids not seen; zoospores not observed, liberated through a broad 

 apical pore; resting spore (?) epibiotic, spherical, 15-19 u. in diam- 

 eter, with a very thick (4 u.), pale ocher-yellow wall of two layers, 

 outer wall 2.5 \x thick in surface view, covered with raised punctations, 

 appearing prismatic in optical section, inner wall 1.5 [i thick, strongly 

 refractive, homogeneous; germination not seen. 



On oogonia of Oedogonium vaucherii, Braun (be. eit.), Germany; 

 Oedogonium vaucherii in company with Chytridium olla, Scherffel (loc. 

 eit.), Hungary. 



Fischer and others have regarded this species as based only on the 

 immature sporangia of a Rhizophydium, possibly R. globosum. The 

 small size of the empty sporangia found by Scherffel and the fact that 

 his fungus occurred on the same host as Braun's led him to suggest 

 the reestablishment of the species. Unfortunately, the lack of infor- 

 mation on the exact nature of spore discharge and on the rhizoids, 

 and want of positive proof other than association that the resting 

 spores (observed by him) and sporangial stage belong to the same 

 fungus make this suggestion of questionable value. 



? Rhizophydium sp. Viegas and Teixeira 

 Bragantia, 3: 225, pi. 3. 1943 

 Sporangium globose, hyaline, 7-9 \i in diameter, with a smooth deli- 



