CHYTRIDIALES 519 



Chytridium gibbosum Scherffel 



Hedwigia, 41: (105). 1902; Arch. Protistenk., 54:239, pi. 11, figs. 133-134. 



1926 



Sporangium sessile, utriculate, somewhat tubular, gibbose dorsally, 

 erect, oblique, or decumbent, thin-walled, bearing laterally at the base 

 the thick-walled half-spherical unexpanded remnant of the zoospore 

 case; rhizoids arising from two lateral opposite prolongations of a 

 spherical or somewhat flattened endobiotic subsporangial apophysis; 

 zoospores with a single globule and a flagellum, escaping upon the 

 dehiscence of a slightly convex operculum 4 [i in diameter, movement 

 hopping; resting spore not observed. 



Saprophytic on filaments of Cladophora fracta, Closterium sp., Hun- 

 gary. 



Considered by Scherffel as being possibly only a subspecies of Chy- 

 tridium schenkii, but differing from that species in having a more tubular 

 and gibbose sporangium. On Closterium the sporangia were more ovoid 

 than on Cladophora, approaching in this respect those of C. schenkii. 



Chytridium chlorobotrytis Fott 

 Preslia, 24:202, fig. 4. 1952 



Sporangium ovate or ellipsoidal, transversely placed, 12-14 \x long 

 by 9-10 [j. high by 8 \x wide; endobiotic subsporangial part very delicate, 

 spherical, 6-7 [x in diameter, without rhizoids, usually with a spherical, 

 up to 4 jjl in diameter, oil drop; zoospores not observed but presumably 

 escaping upon the dehiscence at the narrower sporangial apex of an 

 operculum 5 \i in diameter; resting spores endobiotic, spherical, 8-10 \i 

 in diameter, with a slightly thickened wall and a large up to 8 ja in 

 diameter refractive fat droplet, germination not observed. 



Parasitic on Chlorobotrys polychloris, Czechoslovakia. 



Chytridium scherffelii (Scherffel) Sparrow 



J. Linn. Soc. London (Bot.), 50: 431. 1936 



Chytridium pusillum Scherffel, Abstracts of Communications, V Inter. Bot. 

 Congress, Cambridge, 1930:223; Arch. Protistenk., 73: 143, pi. 9, fig. 

 4 a-f. 1931. Non C. pusillum Sorokin, Arch. Bot. Nord France, 2:24, 

 fig. 23. 1883 (separate). 



