116 ILLINOIS BIOLOGICAL MONOGRAPHS [354 



Vegetative form : Elongated or irregular. Slowly ameboid, moving by- 

 means of a broad, lobose pseudopodium of hyaline ectoplasm. Body 

 colorless. Ectoplasm only distinct in pseudopodium. Endoplasm finely 

 granular. The mature spores while still within the mother trophozoites, 

 are surrounded by a clear, refractive gelatinous envelope. Diameter of 

 rounded sporulating trophozoites 20/i. Disporous. 



Spore: Cylindrical, ends of valves rounded except at one side, where 

 the polar capsules open at the apex of a small, conical elevation. Spore 

 characterized by the presence of a transparent, homogeneous, gelatinous 

 envelope. Polar capsules pyriform, opening on each side nearly at right 

 angles to the longitudinal axis. Dimensions: length 10 to 11/x, breadth 

 6/i, length of polar capsules 3/x. 



MYXIDIUM PHYLLIUM Davis 



[Figs. 292 and 293] 

 1917 Myxidium phylllum Davis 1917 : 235 



Habitat: Gall-bladder of Gamhusia affinis; Beaufort. 



Vegetative form: Exceptionally large; flattened, leaflike, usually folded 

 on itself; motionless. Pseudopodia were not observed. Ectoplasm forming 

 a distinct transparent layer around entire body. After being on slide for 

 some time ectoplasm usually becomes covered with very numerous, short, 

 hairlike processes. Endoplasm finely granular, contains numerous fat 

 globules. Diameter up to 1.35mm. Polysporous. 



Spore: Fusiform, slightly truncated at each end where polar capsules 

 open. Shell with numerous longitudinal striations. Sporoplasm finely 

 granular, with several small fat globules. Dimensions: length 1 1/x, breadth 

 8/x, diameter of polar capsules 3^. 



MYXIDIUM STRIATUM Cunha et Fonseca 

 1917 Myxidium striatus Cunha et Fonseca 1917:321 



Habitat: Gall-bladder of Menticirrhus americanus L., Bairdiella 

 ronchus Cuv. et Val. ; Brazil. 



Vegetative form: More or less spherical. Body small and colorless. 

 Endoplasm granular. Ectoplasm visible when pseudopodia are formed. 

 Pseudopodia filiform, being projected radially. Size variable, 16ju in 

 diameter in average. 



Spore: Elliptical. Shell with fine longitudinal striations which run 

 parallel to sutural line. Sutural plane oblique to the longitudinal axis of 

 the spore which is thickened at the extremities. Two ovoidal polar cap- 

 sules, one at each end. Dimensions: length 10 to 14^t, breadth 6 to 8/i, 

 length of polar capsules 4/i, length of polar filament 30/i. 



