240 AQUATIC PHYCOMYCETES 



12. Couch (1932:246). See Rhizophydium couchii Sparrow, page 

 241. This species also includes the form described by Domjan (1936: 

 42). -Type III," and Sparrow (1933c: 520). 



13. Sparrow (1933c: 519), on Oscillaloria spp., Spirogyra spp., Na- 

 vicula sp., United States. Records only. The fungus called Rhizophy- 

 dium pollinis, described by Sparrow (1932b: 275, fig. 2d) on pine pollen 

 in the United States, fits closely the description of R. globosutn. The 

 resting spores, however, are smooth-walled, a fact inadvertently omit- 

 ted in the description. See R. sphaerotheca, p. 249. 



14. Sparrow (1936a: 441). Three fungi on different substrata, 

 England: (1) on rotifer (pi. 19, fig. 19); spherical sporangia 1 5—20 [x 

 in diameter, ellipsoidal sporangia 43 by 37 \x; zoospores in both types 

 3 {x in diameter, escaping by from two to three pores ; rhizoids stout, 

 well developed; (2) on pollen of Typha; sporangium spherical, 12-17 [x 

 in diameter; zoospores 3 (i. in diameter, escaping through several pores; 

 rhizoidal system delicate, branched (see Rhizophydium sphaerotheca, 

 p. 249); (3) on OsciJiatoria (see R. sabangulosum, p. 244). 



15. Sparrow (1936b: 258), United States: (1) parasitic on Bryopsis 

 plumosa (marine); sporangium spherical, 13-18 [j. in diameter; rhizoids 

 delicate, branched; zoospores not described; (2) saprophytic on Rhi- 

 zosolenia spp. (marine); sporangium spherical or subspherical, 9-12 fx 

 in diameter; rhizoidal system, so far as observed, consisting of a single 

 delicate unbranched peg; zoospores not observed. The form on Bryop- 

 sis may possibly be identical with the incompletely known Rhizophydium 

 marinum de Wild. Observations on the zoospore discharge of both 

 these organisms are necessary to place them generically. 



16. Aleem (1953: 15, fig. 29), on the marine alga Acrochaetium (?), 

 Sweden. Aleem doubtfully ascribes a fungus with nearly spherical 

 smooth-walled sporangia, 13[x in diameter, to this species. It was 

 attached to the host cell by a "faint" rhizoidal system. Zoospores, 

 2 (j. in diameter, were seen within the sporangium but their escape was 

 not observed. 



Domjan (1936) attempted to divide the fungi she found into types 

 I, II, and III, but the descriptions and figures of these types are too 

 meager to be interpreted. 



The descriptions of the two following forms designated as Rhizo- 



