876 



ORDER VIII. MYXOBACTERALES 



11. Polyangium ferrugineuni Krze- 



mieniewska and Krzemieniewski, 1927. 

 (Acta Soc. Bot. Poloniae, 5, 1927, 97.) 



fer.ru.gi'ne.um. L. adj. Jerrugineus of 

 the color of iron rust. 



Fruiting bodies: Irregular, branched and 

 occasionally constricted coils. Branches of 

 same diameter as the main tube. Cyst wall 

 is brown-red. In the interior no differentia- 

 tion is visible. Rods in cysts are relatively 

 short and thick, 0.8 to 1.1 microns by 2 to 

 2.5 microns, not definitely arranged. Close 

 to Archanguim gephyra, but with cyst walls. 



Source: From soil in Poland and from 

 rabbit dung. 



Habitat: Found on decaying organic mat- 

 ter in soil and in the dung of various ani- 

 mals. 



Illustrations: Krzemieniewski {ibid., PI. 

 V, Fig. 21). 



12. Polyangium indivisum Krzemie- 

 niewska and Krzemieniewski, 1927. (Acta 

 Soc. Bot. Poloniae, 5, 1927, 97.) 



in.di.vi'sum. L. adj. indivisus undivided. 



Vegetative cells: Not described. 



Fruiting bodies: Similar to those in Poly- 

 angium ferrugineuni, but much smaller and 

 bright orange-yellow. Enclosed in a simi- 

 larly colored slime membrane. Interior of 

 coils undifferentiated. Cyst rods 0.8 to 1.0 

 by 3 to 6 microns, straight and rounded on 

 ends. Arranged perpendicularly to the wall, 

 giving a netted appearance resembling 

 Melittangium. 



Source: From soils in Poland. 



13. Polyangium spumosum Krzemie- 

 niewska and Krzemieniewski, 1930. (Acta 

 Soc. Bot. Poloniae, 7, 1930, 254.) 



spu.mo'sum. L. adj. spumosus foamy or 

 frothy. 



Vegetative cells: Straight rods, uniformly 

 thick, with rounded ends; 0.6 to 0.8 by 3.9 

 to 6.8 microns. 



Fruiting body: Colorless sori embedded 

 in hyaline slime forming a common envelope 

 around the cysts. Surface white, foamy in 

 appearance; cysts in irregularly rounded 

 accumulations, 100 to 150 microns in diame- 



ter. Cysts usually spherical, sometimes 

 elongate; 18 to 38 by 20 to 50 microns; av- 

 erage 28 by 34 microns. Cyst membrane col- 

 orless. Cysts contain bundles of shortened 

 cells, a granular colorless mass and a clear 

 oleaginous fluid. 



Habitat: Soil. 



Illustrations: Krzemieniewski {ibid., Pis. 

 XVI and XVII, Figs. 10-13). 



14. Polyangium fumosum Krzemie- 

 niewska and Krzemieniewski, 1930. (Acta 

 Soc. Bot. Poloniae, 7, 1930, 253.) 



fu.mo'sum. L. adj. fumosiis smokjr. 



Vegetative cells: Long, straight, cylindri- 

 cal, with rounded ends; 0.7 to 0.9 by 2.7 to 

 5.7 microns. Encysted cells similar. 



Fruiting body: A flat, crust-like layer of 

 2 to 20 (or more) cysts arranged to form a 

 sorus. Sori rounded, up to 90 microns in 

 diameter, or irregularly shaped; often elon- 

 gate up to 400 microns long. Smoky gray 

 color due to surrounding slime walls. Outer 

 profile of sheath (or corte.x) irregular. Cyst 

 wall 2.4 to 3.5 microns thick; cysts often 

 nearly spherical, 13 to 48 microns in diame- 

 ter, though frequently elongate. Average 

 36 by 44 microns. Colorless, single, enclosed 

 in a transparent membrane. 



Habitat: Soil. 



Illustrations: Krzemieniewski {ibid., PI. 

 XVI, Figs. 6-9). 



15. Polyangium parasiticum Geitler, 

 1924. (Arch. f. Protistenkunde, 50, 1924, 67.) 



pa.ra.si'ti.cum. Or. adj. parasiticus para- 

 sitic. 



Vegetative cells: In water, on the surface 

 of the alga Cladophora. Rods long, cylindri- 

 cal, rounded at end and 0.7 by 4.0 to 7.0 

 microns. At first saprophytic, later entering 

 and destroying the Cladophora cell. 



Fruiting bodies: Sometimes single, usu- 

 ally 2 to 8, microscopically small, united in 

 irregular masses, spherical or somewhat 

 elongated. From 15 to 50 microns, usually 

 25 to 40 microns, with hyaline slime. When 

 mature, red-brown in color with firm wall. 



Source: Found on Cladophora {fractal) in 

 a pool at Vienna. 



lUu.strations: Geitler {ibid.. Figs. 1-10). 



