CHYTRIDIALES 339 



diameter, wall smooth, with three to five small hyaline discharge pa- 

 pillae; rhizoidal system richly branched, arising from all parts of a 

 coarse, trunklike or taproot-like unbranched or branched apophysis; 

 zoospores rounded or oblong and tapering basally, with one to three 

 strongly refractive oil droplets and 22-25 \x long flagellum, escaping 

 upon the dissolution of the papillae; resting spore not observed. 



Pine pollen, soil, Gaertner (be. cit.), North Africa; soil, Gaertner 

 (1954b: 21), Egypt, West Africa, South Africa. 



On nutrient agar the plants attained a size of 250 \x and the spo- 

 rangia bore up to ten discharge papillae. 



Phlyctochytrium chaetiferum Karling 

 Mycologia, 29: 179, figs. 1-3. 1937 



Sporangia sessile, broadly pyriform, ovoid, or subspherical, with a 

 broad protruding apical papilla, 1 2—30 ;jl high by 18-45 fx in diam- 

 eter, the subspherical ones 1 5-47 [i in diameter, wall somewhat thick- 

 ened, colorless, with from three to thirty or more delicate flexible 

 branching hairs up to or exceeding 200 [j. in length; rhizoids one or 

 several, branched, extensive, arising from one to several main axes 

 which branch off from a spherical (8-11 \x in diameter), irregular, 

 elongated, or fusiform subsporangial apophysis; zoospores spherical, 

 2.5-4 (j. in diameter, with a highly refractive colorless centric globule 

 and a long flagellum, emerging in a group surrounded by an evanes- 

 cent vesicle or individually; resting spore ovoid or subspherical, from 

 9 (j. (high?) by 10^. (in diameter?) to 14 by 17 \i, or spherical and 

 10-17 [jl in diameter, wall smooth, moderately thick, colorless, con- 

 tents with one or more large oil globules, endobiotic system like that 

 of the sporangium, germination not observed. (Modified from Karling.) 



Saprophytic on cells of Hydrodictyon reticulatum, Oedogonium sp., 

 Karling (be. cit.), Cladophora sp., Sparrow (1943 : 229), United States. 



Phlyctochytrium aureliae Ajello 

 Mycologia, 37: 111, figs. 1-13. 1945 

 "Sporangia extramatrical, variable in form but predominantly spher- 



