CHYTRIDIALES 253 



referred to as a resting spore of the fungus. There is no such figure 

 number, and it is assumed here that Dangeard meant Figure 16a. 

 The species is kept distinct for reasons mentioned in the discussion 

 of Rhizophydium globosum (see p. 239). 



Rhizophydium amoebae Karling 

 Amer. J. Bot, 33: 331, figs. 5-8. 1946 



"Thalli numerous up to 14 on a host cell. Sporangia sessile, smooth, 

 spherical (8-20 \x) with a low apical exit papilla and a fairly thick, 

 brown, smooth wall. Zoospores oval (2x3 u,) with a minute (0.5-1 u.), 

 somewhat laterally located refractive globule. Rhizoidal system rela- 

 tively sparse but frequently branched. Resting spores spherical (8-14 fjt,) 

 with a thick, dark brown wall and one to several large refractive glob- 

 ules; functioning as prosporangia in germination" (Karling, he. cit.). 



Parasitic on Amoeba terrieola and saprophytic on insect exuviae, 

 Brazil. 



Characterized by spherical brown-walled sporangia, oval zoospores 

 with a minute laterally located refringent globule, thick-walled and 

 dark-brown resting spores. 



Indications were that the fungus was only weakly, if at all, parasitic 

 on amoebae. 



Rhizophydium chitinophilum Antikajian 



Mycologia, 39: 613, figs. 1-20. 1947 



"Sporangia sessile, hyaline, smooth, spherical (7-69 \l), subspherical 

 (15-66 x 17-74 (jl), oval (7-66 x 11-87 \x), or pyriform (8-58 x 11-96 

 \l); neck of sporangium (4-17 x 1 1—28 p.) ; exit papillae one or two, 

 low and broad, usually apical, filled with hyaline matrix (4-13 \l) high 

 and (7-21 \l) wide. Zoospores spherical, approximately 3.6 \x with a 

 minute refractive globule less than 0.7 [x and a large somewhat refrac- 

 tive, granular body about 2.2 [i; fiagellum (21-26 [x). Rhizoids (2-16 [i) 

 in diameter, richly branched, usually arising from a single point at 

 the base of the sporangium, rarely from several points. Resting spores 

 smooth, brown with coarsely granular contents ; wall of resting spore 

 0.7 [x; on germination functioning as a prosporangium" (Antikajian, 

 loc. cit.). 



