CHYTRIDIALES 353 



On zygospores of Spirogyra, France. 



From the position of the resting spores, it is possible that this is a 

 species of Chytridium with proliferating sporangia. Observations on the 

 discharge of the zoospores are necessary before it can be placed gener- 

 ically and the apparent proliferation confirmed. 



? Phlyctochytrium sp. Sparrow 

 Rev. Soc. Cubana Bot., 9: 36, pi. 1, fig. J. 1952 

 Sporangium subspherical, 35 \x in diameter by 20 \x high, with a broad 

 apical discharge pore 10-12 \x in diameter around which are four very 

 inconspicuous plain teeth 3 [j. high; rhizoidal system branched, arising 

 from a single stout main axis which emerges from a subsporangial 

 apophysis 10 \x in diameter; zoospores spherical, 3 (jl in diameter, with a 

 basal globule and a central refractive arc-shaped structure (nuclear cap?), 

 emerging en masse from the sporangium in a quiescent group, later 

 assuming motility; resting spore not observed. 



Parasitic on an oogonium of Achlya sp., Cuba. 



EXCLUDED SPECIES OF PHLYCTOCHYTRIUM 



* Phlyctochytrium euglenae (Dang.) Schroeter 



Engler and Prantl, Naturlichen Pflanzenfam., 1 (1): 79. 1892 



Rhizidium euglenae Dangeard, Ann. Sci. Nat. Bot., VII, 4: 301, pi. 13, 

 figs. 11-19. 1886; Le Botaniste, 1 : 64, pi. 3, fig. 22. 1889. 



Sporangium narrowly elongate-pyriform, ovoid, subspherical, or 

 somewhat angular and irregular, 30 (j. long by 10-18 \x in diameter, wall 

 thin, smooth, borne on a spherical apophysis about 5-6 \jl in diameter, 

 which either rests directly on the wall of the host cell or is attached to it 

 by a slender unbranched stalk; endobiotic rhizoid an unbranched tube; 

 zoospores spherical, 2 ;ji in diameter, with a basal colorless globule and 

 a flagellum, discharged through a single apical pore (rarely two); resting 

 spore spherical, thick-walled, brownish, the outer surface either smooth, 

 slightly verrucose, or covered with short slender spines, borne on an 

 extramatrical or endobiotic spherical apophysis from the base of which 

 a slender unbranched filament arises, germination not observed. 



Parasitic on resting cells of Euglena, Dangeard (he. cit.), France; 

 coll. Marchal, de Wildeman (1890:1 1, fig. 2), Belgium. 



