CHYTRIDIALES 521 



eter; operculum 6 ;x in diameter; zoospores 5 \x in diameter, with a 

 small globule. 



2. Sporangium 7 fx in diameter by 10 u, high ; apophysis 5 u, in diameter ; 

 operculum 4 fx in diameter; zoospores 3 u, in diameter, with a relatively 

 large globule. 



The species is very doubtfully separate from Chytridium lagenaria 

 Schenk, differing only in having more distinctly pyriform sporangia 

 and a more strongly convex operculum. 



Chytridium citriforme Sparrow 

 Rev. Soc. Cubana Bot., 9: 68, figs. H-J. 1952 



Sporangium sessile, citriform, 23-26 u. by 13-20 ;x, with a smooth, 

 colorless wall and a 6-10 \x broad subapical papilla surmounted by a 

 moderately convex operculum, 6-10 \x in diameter; endobiotic part 

 consisting of a spherical, subsporangial apophysis, 10-12 ;x (rarely 4 (x) 

 in diameter, from the base of which emerges a branched rhizoidal system; 

 zoospores formed within the sporangium, posteriorly uniflagellate, spher- 

 ical or somewhat ovoid, 4 \i in diameter, with a single colorless centric 

 globule, emerging upon the dehiscence of the operculum and forming 

 a temporary motionless group before assuming motility; resting spore 

 endobiotic, spherical, 14-16 [x in diameter, with a smooth, thickened, 

 amber-colored wall; germination not observed. 



Saprophytic on pollen of Pinus caribaea in aquatic debris, Cuba. 



The subapical position of the discharge papilla imparts a highly 

 characteristic tilted aspect to the sporangium. 



Chytridium brevipes Braun 



Monatsber. Berlin Akad., 1856: 587 



Sporangium sessile, obovoid, broadly ovoid, or urceolate, 27 jx high 

 by 20 [x in diameter, the slightly convex operculum usually terminating 

 in a conical umbo, wall smooth, colorless; endobiotic part consisting 

 of a thin-walled spherical subsporangial swelling without rhizoids which 

 at maturity is cut off from the sporangium by a knoblike or conical 

 septum ; zoospores spherical, 5 fx in diameter, with an eccentric colorless 

 globule 2 [x in diameter in the finely granular plasma and a flagellum 



