FAMILY POLYANGIACEAE 



1029 



walls. Cysts forming outside the large 

 masses usually rounded; those within 

 often polygonal or angular. Cysts 5 to 

 24 microns long, oval or egg-shaped. 

 Encysted cells give cysts granular ap- 

 pearance. Ripe cysts brown to light 

 brown in color; immature, yellow to 

 pink. Fruiting bodies pinkish-yellow 

 when young, becoming brown when 

 ripened. Considerable variation in form : 

 round, oval or sausage-shaped, and from 

 50 to 80 microns up to several hundred 

 microns. Outer slime envelope often 

 indistinct; no dried slime noticeable 

 between the cysts. 



Spores : No data. 



Vegetative cells : Identical with those 

 of Polyangium cellidosum var. ferru- 

 gineum. 



Vegetative colony : A faint yellow cast 

 on cellulose-silica gel after 2 to 3 days. 

 Becomes yellow-orange to yellow-pink 

 after 6 to 8 days, while center is brownish- 

 gray. Margin pinkish to yellow-pink. 

 Surface dull, moist. As fruiting bodies 

 ripen, colony becomes darker, finally dark 

 brown. Reaches diameter of 2 to 5 cm. 

 Fruiting bodies often arranged in form of 

 pigmented, closely set, concentric rings. 

 Margin of colony not clearly defined. 

 Usually regularly rounded or oval. 

 Cellulose completely destroyed only at 

 center of colony. 



Source: Common in black soils of 

 Sumy Experiment Station. Found only 

 once in podzol soils. 



Habitat : Digests organic matter in soil. 



5c. Polyangium cellulosum var. fulvum 

 Mishustin. (Microbiology, Moscow, 7, 

 1938, 427.) 



Etymology : Latin fulrus, reddish- 

 yellow, gold-colored. 



Fruiting body : Rose or pink in color, 

 composed of numerous cysts. Young 

 cysts yellow to yellow-orange, becoming 

 pink, rose or red, or pinkish-yellow. 

 Cysts same shape as others of the species; 

 6 to 24 microns in diameter, average 10 

 to 12 microns; contain many short rods. 

 Fruiting bodies vary in shape, often 



elongated, flagella (?)-shaped (columnar?), 

 up to 20 to 25 by 350 to 450 microns. 

 Also globular, mace-shaped, etc. 

 Usually 25 to 40 by 50 to 80 microns. 

 Cysts inclosed by outer common envelope 

 or slime membrane. Easily broken up 

 mechanically. 



Spores : No data. 



Vegetative cells : 0.8 to 1.2 by 3.5 to 6.0 

 microns. 



Vegetative colony: On cellulose-silica 

 gel form a hardly visible white (colorless 

 ?) colony at 2 days. After 6 days be- 

 comes pink in color. Fruiting bodies 

 first form near center. After 9 to 10 

 days central area reddish-pink while 

 periphery has yellowish cast. ]\Iature 

 colony 2.5 to 7.5 cm in diameter, pink- 

 orange color, fairly regularly round or 

 oval in shape. Pigmented concentric 

 rings of fruiting bodies. 



Physiology : Cellulose entirely de- 

 stroyed at center of colony and often at 

 other points. 



Source : Podzol soils of Timiriazev 

 Agricultural Academy. Seldom in black 

 soils of Sumy Experiment Station. 



Habitat : Digests organic matter in 

 soils. 



5d. Polyangium cellulosum var. luteum 

 Mishustin. (Microbiology Moscow, 7, 

 1938,427.) 



Etymology : Latin luteus, saffron-yel- 

 low, orange-j^ellow. 



Fruiting body : Poorly organized ag- 

 glomerations of colorless to yellow cysts 

 inclosing sporulated cells. Cysts regu- 

 larly egg-shaped to oval, 8 to 20 microns 

 in diameter; predominantly 6 to 10 

 microns. Matured cysts loosely con- 

 nected into rounded or elongate masses 

 40 to 80 by 100 to 150 microns. Ripe 

 fruiting bodies easily pulled apart. 



Spores : No data. 



Vegetative cells : Similar to others of 

 the species. 



Vegetative colony : On cellulose colo- 

 nies regularly rounded or oval, surface 

 has moist appearance. Yellowish cast 

 2nd or 3rd day, becoming deeper yellow. 



