CHYTRIDIALES 455 



eral long branched delicate rhizoids the tips of which enter the host 

 cells ; sporangium variable in shape, unsymmetrical, mostly ovoid, with 

 a broad base, larger than the prosporangium ; zoospores spherical, 4 [i 

 in diameter, with a colorless globule and a long flagellum ; resting spore 

 spherical, ovoid, elongate, or narrowly biscuit-shaped, 12-22 \x long by 

 8-12 [x broad, with a smooth yellowish thick wall, germination not 

 observed. 



Parasitic on Chlamydomonas pluvialis, Java, Indonesia. 



Polyphagus parasiticus Nowakowski 



Akad. umiejetnosci Krakowie. Wydziat mat.-przyrod., Pamietnik, 4: 174, 



pi. 10, figs. 101-107. 1878 



(Fig. 29 H-J, p. 450) 



Prosporangium lying free between the filaments of the host, pyriform, 

 clavate, or irregularly broadly fusiform, terminal or more often inter- 

 calary between two opposite main rhizoidal axes, from which, as well 

 as from the body, arise more delicate branched rhizoids; sporangium 

 generally formed as a lateral outgrowth from the prosporangium, ovoid, 

 16 [x long by 14 [j. broad, wall thin, colorless; zoospores few, spherical, 

 6-8 (j. in diameter, with a large (4 jx) colorless basal globule and a long 

 flagellum, escaping upon the gelatinization of the upper half of the 

 sporangium wall ; resting spore formed in the tip of the laterally or api- 

 cally applied conjugation tube, spherical, 9-18 \i (mostly 12-14 ja) in 

 diameter, with a thick brownish wall covered with short conical spines, 

 contents bearing a large (7-14 [jl in diameter) colorless globule, upon 

 germination functioning as a prosporangium. 



Parasitic in Tribonemabombycma, Nowakowski (Joc.cit.), Germany(?), 

 Rieth (1954: 165, fig. 2), Germany; Scherffel (1902a; 1904; 1925b: 2, 

 pi. 1, figs. 1-10), Hungary; Sparrow (1943: 301), United States. 



Scherffel (1925b) and more recently Rieth {he. cit.) have given a 

 complete account of this little-known species. In Michigan it is found 

 in early spring among filaments of Tribonema. 



The fungus with smooth-walled resting spore, figured by Rieth (1954: 

 167, fig. 2 H,I) on Tolypothrix lanata, appears to be a new species. 



