836 MANUAL OF DETERMINATIVE BACTERIOLOGY 



APPENDIX TO SUBORDER CAULOBACTERIINEAE. 



The family Pasteuriaceae included among the stalked bacteria by Henrici and 

 Johnson {'loc. cit.) has been placed in this appendix as the organisms belonging to 

 the genera Pastauria and Blastocaulis reproduce by methods of fission or budding, 

 or both, that are different from the methods of reproduction found in other bacteria. 

 Further information regarding the organisms in these genera is greatly needed. 



FAMILY A. PASTEURIACEAE LAURENT EMEND. HENRICI AND JOHNSON. 



(Laurent, Compt. rend. Acad. Sci., Paris, 3, 1S90, 754; Henrici and Johnson, Jour. 

 Bact., 30, 1935, 84.) 



Stalked bacteria with spherical or pear-shaped cells; if cells are elongated, long 

 axis of cell coincides with axis of stalk. Stalks may be very short or absent, but when 

 present are usually very fine and at times arranged in whorls attached to a common 

 holdfast. Cells multiply by longitudinal fission or by budding, or by both. Mostly 

 periphytic, one species is parasitic. 



Ke7j to the genera uf famihj Pasteuriaceae. 



I. Stalks lacking, cells sessile. 



Genus I. Pasteuria, p. 836. 

 II. Stalks long and slender, often in whorls. 



Genus II. Blastocaulis, p. 836. 



Genus I. Pasteuria Metchnikoff. 



(Ann. Inst. Past., 2, 1888, 166.) Named for Louis Pasteur, the French chemist 

 and bacteriologist. 



Pear-shaped cells attached to each other or to a firm substrate by holdfasts se- 

 creted at the narrow end, multiplying by longitudinal fission and by budding of 

 spherical or ovoid cells at the free end. 



The type species is Pasteuria rainosa MetchnikofI'. 



1. Pasteuria ramosa ]\Ietchnikoff. longitudinal fission and by intracellular 



(Ann. Inst. Past., 2, 1888, 465.) From spores (?) which are extruded as bud-like 



Latin ramosus, branched. bodies. 



Cells grow attached to each other in Habitat: Parasitic in the body cavities 



cauliflower-like masses, multiplying by of Dnphuia pnlex and Daphnia magna. 



Genus II. Blastocaulis Heurici and Johnson. 



(Jour. Bact., 30, 1935, 84.) From Greek blaslos, bud, germ and Latin caulis, stalk. 



Pear-shaped or globular cells attached to a firm substrate by long slender stalks 

 with a holdfast at the base. Stalks may occur singly or may arise in clusters from a 

 common holdfast. Growing on firm substrates in fresh water. Not cultivated on 

 artificial media. 



The type species is Blastucaulis sphaerica Henrici and Johnson. 



1. Blastocaulis sphaerica Henrici and istically by budding, often staining 



Johnson. (Jour. Bact., 30, 1935, 84.) deeply at the free pole and faintly at the 



From Latin sphaera, sphere. attached pole, 1 to 2 microns in diameter. 



Cells spherical, multiplying character- Habitat : Water. 



