1082 



MAXUAL OF DETERMIXATIVE BACTERIOLOGY 



Fruiting body : Colorless sori embedded 

 in hyaline slime forming a common en- 

 velope around the cysts. Surface white, 

 foamy in appearance; cysts in irregularly 

 rounded accumulations, 100 to ISOmicrons 

 in diameter. Cysts usually spherical, 

 sometimes elongate; 18 to 38 by 20 to 50 

 microns; average 28 by 34 microns. 

 Cyst membrane colorless. Cysts con- 

 tain bundles of shortened cells, a granu- 

 lar colorless mass, and a clear oleaginous 

 fluid. 



Spores: Shortened rods. 



Vegetative cells: Straight rods, uni- 

 formly thick, with rounded ends; 0.6 to 

 0.8 by 3.9 to 6.8 microns. 



Habitat: Soil. 



Illustrations: Krzemieniewski {loc. 

 cit.) Plates XVI-XVII, Figs. 10-13. 



14. Polyangium fumosum Krzemien- 

 iewski. (Acta Soc. Bol. Pol., 7, 1930, 

 253.) 



Etymology : Latin fumosus, smoky. 



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 

 elongate up to 400 microns long. Smoky- 

 gray color due to surrounding slime walls. 

 Outer profile of sheath (or cortex) ir- 

 regular. Cyst wall 2.4 to 3.5 microns 

 thick; cysts often nearly spherical, 13 

 to 48 microns in diameter, though fre- 

 quently elongate. Average 36 by 44 



microns. Colorless, single, inclosed in 

 a transparent membrane. 



Spores : No data. 



Vegetative cells: Long, straight, cy- 

 lindrical with rounded ends; 0.7 to 0.9 

 by 2.7 to 5.7 microns. Encysted cells 

 similar. 



Habitat: Soil. 



Illustrations : Krzemieniewski (loc. 

 cit.) Plate XVI, Figs. 6-9. 



15. Polyangium parasiticum Geitler. 

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



Etymology : Latin parasiticus, para- 

 sitic. 



Swarm stage (pseudo Plasmodium) : In 

 water, on surface of the alga Cladophora. 

 Pseudoplasmodia small. Rods long, cy- 

 lindric, rounded at end and 0.7 by 4 to 7 

 microns. At first saprophytic, later 

 entering and destroying the Cladophora 

 cell. 



Fruiting bodies : Sometimes single, 

 usually 2 to 8 microscopically small, 

 united in irregular masses, spherical ori 

 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 and habitat : Found on Clado- 

 phora (fracta?) in pool at Vienna (Geitler, 

 1924). 



Illustrations: Geitler (1924, loc. cit.) 

 Figs. 1-10. 



Genus II. Synangium Jahn. 



(Jahn, Beitrage zur botan. Protistologie. I. Die Polyangiden, Geb. Borntraeger, 

 Leipzig, 1924, 79; Apelmocoena Enderlein, Bakterien-Cyclogenie, Berlin, 1924, 243.) 



Etymology: Greek syn, together and angion, vessel, referring to the clustering of 

 the cysts. 



Diagnosis: Cysts provided with an apical point, united more or less completely 

 to rosette-shaped, hemispherical or spherical fruiting bodies. 



The type species is Synangium sessile (Thaxter) Jahn. 



Key to the species of genus Synangium. 



I. Cysts irregular, pointed, united as a rosette on a slimy base, without a stalk. 



1. Synangium sessile. 

 II. The fused cysts on a simple or branched stalk. 



A. Cyst group spherical, with the points of the cysts covered as with hair, reddish. 



2. Synangium lanuginosum. 



