CHYTRIDIALES 299 



Cejp (1933a: 4, pi. 1, fig. 11) has described as Rhizophydium lagen- 

 ula (Braun) Fischer an organism on Mougeotia that agrees with R. 

 fusus in the fusiform shape of the sporangium, but which is larger 

 (30 [x or more Jong by 8-10 u, in diameter) and which forms epibiotic 

 spherical thick-walled resting spores, 25 u. in diameter. He considers 

 R. lagenula to be identical with R. fusus. 



Rhizophydium nodulosum Karling 

 Mycologia, 40: 328, figs. 1-10. 1948 



"Sporangia hyaline, smooth, predominantly angular or nodular, 

 up to 65 \l in diam., oval, 10-25 x 15-50 jx, spherical, 10-35 [x, oblong, 

 pyriform or irregular with 1-15 prominent exit papillae, 4-8 jx high 

 by 8-15 jx broad at the base. Zoospores spherical, 2.8-3.2 jx, with a 

 minute refractive globule, 0.4-0.8 u, diam.; flagellum 15-18 jx long. 

 Rhizoids usually well developed but sparingly branched, arising from 

 one to several points on the base of the sporangium, main axes up to 

 7 [x in diam., branches extending for distances of 30-270 [x. Resting 

 spores unknown" (Karling, he. cit.). 



Saprophytic on dead human hair and other keratinized substrata 

 in muck soil and fresh water, United States. 



The species is characterized by the strikingly gibbose sporangia, 

 which have an angular or nodular appearance, due to the prominent 

 discharge papillae. 



Rhizophydium gibbosum (Zopf) Fischer 



Rabenhorst. Kryptogamen-Fl., 1 (4): 102. 1892 



(Fig. 17 W, p. 228) 



Rhizophyton gibbosum Zopf, Nova Acta Acad. Leop. -Carol., 52: 344, 

 pi. 20, figs. 8-20. 1888. 



Sporangium sessile, occasionally stalked, ovoid, pyriform, or fusi- 

 form, with several or many humplike lobes which give an irregular 

 gibbose appearance to the whole structure, sporangia, when few on 

 a cell, up to 25-45 jx long by 10-20 [x in diameter, when many, 11 fx 

 long by 8 (x in diameter, upright or somewhat tilted, with a single 

 terminal broad papilla, wall colorless, fairly stout; rhizoids profusely 



