at right angles to the axis of the broad, lobe- Source: Found in the aquarium in the like stalk. Cells 2 by 6 to 12 microns, con- taining a number of highly refractile glob- ules of fat or sulfur. Multiplication by Botanical Garden, St. Petersburg. Similar but smaller organisms found b}' Henrici binary fission. and Johnson (Jour. Bact., SO, 1935, 63) in a Not cultivated on artificial media. Note: Nevskia pediculata Henrici and Johnson is now regarded as a Lactobacillus. See Lactobacillis brevis Bergey et al., syn. apolis. Betabacterium vermijonne IMayer. Habitat : Found in water jar of water from the lily pond of the Univer- sity of Minnesota greenhouse in Minne-
FAMILY VI. SIDEROCAPSACEAE PRIBRAM, 1929.[1]
(Tribe Siderocapseae Buchanan, Jour. Bact., 2, 1915, 615; Pribram, Jour. Bact., 18, 1929, 377.)
Si.de.ro.cap.sa'ce.ae. M.L. fem.n. Siderocapsa type genus of the family; -aceae suffix to denote a family; M.L. fem.pl.n. Siderocapsaceae the Siderocapsa family.
Cells spherical, ellipsoidal or bacilliform. Frequently embedded in a thick, mucilaginous capsule in which iron or manganese compounds may be deposited. Motile stages, where known, are polar flagellate. Free-living in surface films or attached to the surface of submerged objects. Form deposits of iron and manganese compounds. Autotrophic, facultatively autotrophic and heterotrophic species are included in the family. Found in fresh water.
The morphology of the bacteria of this family is best determined after dissolving the iron or manganese compounds with weak acids and staining with Schiff's reagent.
The type genus is Siderocapsa Molisch.
Key to the genera of family Siderocapsaceae.
I. Cells surrounded by capsular matter with iron compounds deposited either on the surface or throughout the capsular material.
- A. Cells coccoid.
- 1. Cells in masses in a common capsule.
Genus I. Siderocapsa, p. 218.
- 2. Cells always in pairs in a gelatinous capsule.
Genus II. Siderosphaera, p. 220.
- B. Cells ellipsoidal to bacilliform.
- 1. Cells heavily encapsulated but do not possess a torus.[2]
- a. Cells in chains in a gelatinous capsule.
- b. Chains of ellipsoidal cells embedded in a gelatinous capsule, the outlines of which follow the form of the cells.
Genus III. Sideronema, p. 220.
- bb. Rods in pairs or chains in surface films.
- ↑ Manuscript prepared by Prof. Robert S. Breed, Cornell University, Geneva, New York, December, 1953; further revision with the introduction of additional genera and species by Prof. Dr. Herbert Beger, Institutfur Wasser-, Boden- und Lufthygiene, Berlin-Dahlem, Germany March, 1954.
- ↑ The so-called torus is a marginal thickening of a thin capsule. The torus is heavily impregnated with iron compounds so that the torus of an individual cell looks like the link of a chain or, if incomplete, like a horseshoe.
