522 AQUATIC PHYCOMYCETES 



45 (x in length, ejected at the dehiscence of the operculum through a 

 broad apical pore and forming a temporarily motionless mass, move- 

 ment hopping or amoeboid; resting spore endobiotic, smooth-walled, 

 with a large oil globule, germination not observed. 



On oogonia of Oedogonium flavescens, O. apophysatum, Braun (loc. 

 cit.), Germany; Oedogonium vaucherii, Oedogonium sp., Scherffel( 1926a: 

 225, pi. 10, figs. 107-109, 111-114), Hungary; in oogonium of 

 Oedogonium sp., Shen and Siang (1948: 184, fig. 6; as C. olid), China. 



Considered by Fischer (1892: 126) and Minden (1915: 366) only a 

 small form of Chytridium olla. The observations of Scherffel (loc. cit.) 

 that the small size is maintained even when the fungus occurs alone on 

 the host cell, as well as his confirmation of the fact noted by Braun (not 

 mentioned by Fischer and Minden) that there was an endobiotic swell- 

 ing, indicate that we are dealing with a distinct species. See remarks 

 under C. acuminatum Braun, p. 495. 



Chytridium lagenaria Schenk, pro parte 



Ueber das Vorkommen contractiler Zellen im Pflanzenreiche, p. 5, figs. 11-13. 

 Wurzburg, 1858. Non C. lagenaria Schenk, Verhandl. Phys.-Med. Gesell. 



Wurzburg, A. F., 8: 241. 1858 



(Fig. 31 L-M, p. 496) 



Rhizidium lagenaria (Schenk) Dangeard, Le Botaniste, 1 : 64, pi. 3, fig. 23. 



1889. 

 Rhizidium westii Massee, British Fungi, p. 155, pi. 2, figs. 36-37. London, 



1891. 

 Phlyctochytrium westii (Massee) de Wildeman, Bull. Soc. Roy. Bot. Belg. 



(Mem.), 35:48. 1896. 



Sporangium sessile, spherical, subspherical, ovoid, urceolate, or 

 broadly pyriform, somewhat dome-shaped when immature, variable in 

 size, wall somewhat thickened, smooth, colorless; rhizoids generally 

 stout, up to 9 [x in diameter at the point of origin, much branched, 

 occasionally absent, when present usually arising from a single axis 

 produced at the base of a spherical, subspherical, flattened, fusiform, 

 or broad tubular apophysis of variable size; zoospores spherical or 

 somewhat ovoid, 3-5.5 u. in diameter, with a colorless centric or eccen- 

 tric globule and a flageilum about 20 \i in length, emerging through a 



