GENERAL SYSTEMATIC BACTERIOLOGY 437 



diffuses through the medium as green, blue or yellowish-green. Motile 

 or non-motile. Gram- negative." 



Pseudorhizobium. A generic name used by Hartleb (1900, p. 887) 

 for an organism isolated from the nodule of a legume. He named the 

 form Pseudorhizobium ramosum. The organism resembled the normal 

 legume bacteria but appeared to be non-infectious. The name has 

 apparently not been used by other writers. 



Pseudosarcina. According to Lohnis (1913, p. 449) the genus 

 Pseudosarcina was named by Mace (1903, p. 887). An examination of 

 the statement of the latter author fails to show such generic name. 

 The term used is pseudosarcine, employed apparently simply in a 

 casual sense. He says: 



Ce microbe se presente insole, et alors il est spherique, ou sous forme d'agre- 

 gats plus ou moins volumineaux, d'un aspect miiriforme: rappelant une grosse 

 sarcine, en raison de cette analogie je le designerai provisoiremen par le terme 

 de pseudosarcine cal il ne semble pas que ses bipartitions se fassent suivant deux 

 plans perpendiculaires. 



Pseudo-sarcine. See Pseudosarcina. 



Pseudospira. A subgenus of the genus Pacinia used by Trevisan 

 (1889, p. 1018) with the following diagnosis: 



Baculi curvi, non raro semicirculares, saepissime in filamenta undulato- 

 flexuosa vel irregulariter pseudospirilia, nunquam vere spiraliter ut in SpiriUeis 

 torta, consociati Arthrosporae notabiliter quam in Eu-Paciniis minores, nun- 

 quam dupio diametri transversalis baculorum latiore. 



Eight species are included in the subgenus. The type species may 

 be designated as Pacinia cholerae asiaticae. The organisms of this 

 group are those ordinarily assigned to Vibrio or to Microspira. 



Punctula. A generic name used by Van Tieghem (1880, p. 150). 

 The following summary is from Journal Roy. Mic. Soc. (1880, p. 1001). 



Punctula. The spherical cells are ordinarily extremely minute; they appear 

 like innumerable dots united by a gelatinous cement. A close examination is 

 required to distinguish the colonies composed of them from simple naked cells 

 consisting of a finely granular protoplasm. 



In Punctula rosea the colonies are of a bright rose colour; they are spheri- 

 cal, and with a sharply defined outline; the dots, which are so many elementary 

 cells, are arranged in them with perfect regularity in radial rows and concentric 

 circles. After each division, the two halves of the colony become rounded off, 

 and separate completely. When one of these spheres is crushed, it is resolved into 

 its elementary cells, and the formation can then be followed of so many new colo- 

 nies by the repeated increase and division of each of the cells. 



