CHYTRIDIALES 241 



phydium globosum have not been examined: Schaarschmidt (1883: 62) 

 and Entz, Jr. (1931: 12), both based on material from Hungary. 

 See also Rhizophydium pollinis-pini, p. 268. 



Rhizophydium couchii Sparrow 



Aquatic Phycomycetes, p. 167, Fig. 2 G-I. 1943 



(Fig. 4 G-I, p. 72) 



Sporangium sessile, spherical, slightly subspherical, or somewhat 

 ellipsoidal, with from one to three protruding discharge papillae, 

 1 1-30 u. in diameter, wall of variable thickness (up to 2 \l), smooth, 

 colorless; rhizoidal system extensive, much branched, arising from a 

 more or less prolonged, sometimes slightly inflated main axis; zoo- 

 spores spherical or slightly ovoid, 2-5 ;ji in diameter, with a small 

 eccentric colorless globule and a long flagellum, escaping slowly, often 

 amoeboidly, through one apical pore or through from two to three 

 apical, subapical, and lateral pores formed upon the deliquescence of 

 the papillae, movement hopping; resting spore spherical or somewhat 

 ellipsoidal, 10-14 jx in diameter, with a thick smooth colorless wall 

 which is occasionally surrounded by an irregular brownish incrustation, 

 contents with a large oil globule, rhizoidal system branched, germi- 

 nation not (?) observed; contributing thallus spherical, thin-walled, 

 5 [i in diameter, adnate to the receptive plant, sessile, rhizoidal system 

 rudimentary if present. 



On Spirogyra areolata, Spirogyra sp., Mougeotia sp., Couch (1932: 

 246, pi. 14), Spirogyra sp., Sparrow (1933c: 520, pi. 49, figs. 15-22), 

 United States; Spirogyra, water of salinity 9.6-10.1 percent, Aleem 

 (1952a: 2650). France. 



The species was described by Couch (loc. cit.) under the name 

 Rhizophydium globosum and by Sparrow (1933c) as Rhizophydium sp. 

 It differs from R. globosum in several features, as Couch has pointed 

 out. Most important of these is that the resting spore is smaller (10-14 

 u.), smooth-walled, and sexually formed (see under "Sexual Repro- 

 duction," p. 70). R. globosum "Type III" of Domjan (1936) is, from 

 the figures, very similar to R. couchii. Since her form is described only 

 in Hungarian a further comparison has not been attempted. 



