1026 MAK^tTAL OF DETERMINATIVE BACTERIOLOGY 



ee. Cysts numerous. Rods 1.3 to 2.0 microns long. Cysts 

 20 to 80 microns. 



2. Polyangium minus. 

 dd. Slime envelope bright yellow. 



3. Polyangium luteum. 



cc. Closely appressed; often polygonal due to pressure, 

 d. Bright yellow. 



4. Pohjangiimi morula. 

 dd. Orange. 



5. Polyangium cellulosum. 

 bb. Cysts single, large. 



c. Large, 250 to 400 microns; reddish-yellow. 



6. Polyangium simplex. 



cc. Smaller, 30 to 60 by 50 to 130 microns; orange to light red. 



7. Polyangiu77i ochraceum. 

 aa. Ripe cysts reddish-brown to dark brown. 



b. Cysts lying free, covered by a more or less definite slime envelope, 

 c. About 60 microns in diameter; slime envelope delicate and 

 colorless. 



8. Polyangium fuscum. 



cc. About 35 microns in diameter; slime envelope yellow. 



9. Polyangium, aureum. 



bb. Cysts rounded, in stellate arrangements on a slimy substrate. 



10. Polyangium stellatum. 

 2. Cysts elongate, coiled. 



a. Cysts brownish-red. 



11. Polyangium ferrugineum. 

 aa. Cysts bright orange-yellow. 



12. Polyangium indivisum. 

 B. Sorus white or gray in color. 



1. Hyaline slime envelope white, foamy in appearance; cysts average 28 by 



34 microns. 13. Polyangium spumosum. 



2. Sorus flat, crust-like, smoke-gray in color due to slime envelope; cysts 



average 36 by 44 microns. 



14. Polyangium fumosum. 

 II. Aquatic, parasitic on Cladophora. 



16. Polyangium parasilicum. 



1. Polyangium vitellinum Link. microns, occasionally 200 microns in 



(Link, Mag. d Ges. Naturforschender diameter, almost always surrounded 



Freunde zu Berlin, 3, 1809, 42; Myxo- by a white slimy envelope, about 10 to 



bacter aureus Thaxter, Bot. Gaz., 17, 15 cysts in a mass. Rods in the cysts 



1892, 403.) about 3 microns in length. 



Etymology: Modern Latin riicllus, Source and habitat : Thaxter {loc. cit.) 



like an egg yolk. on very wet wood and bark in swamps. 



Swarm stage (pseudoplasmodium) : Maine, Belmont. Jahn (1924, loc. cit.) 



When rising to form cysts, milky white. states it is not common; on old wood, 



Rods large, cylindrical, rounded at either lying in moist ditches, also on old poplar 



end, 0.7 to 0.9 by 4 to 7 microns. bark which was kept moist in a dish, also 



Fruiting body: Cysts golden yellow, found twice on rabbit dung, 



usually relatively spherical, 75 to 150 Illustrations: Thaxter {loc. cit.) PL 



