206 COMMITTEE REPORT 



Genus 2. Diplococcus Weichselbaum 1886, p. 506 emended 



Synonyms: Klebsiella Trevisan 1885, in part; Hyalococcus Schroeter 

 1886; Pseudodiplococcus Bonome, 1888; Pneumococcus? Schmidlechner 

 1905. 



Parasites, growing poorly, or not at all, on artificial media. 

 Cells usually in pairs of somewhat elongated cells, often capsu- 

 lated, sometimes in chains. Gram positive. Fermentative pow- 

 ers high, most strains forming acid in glucose, lactose, sucrose 

 and inulin. 



Type species, D. pneumoniae Weichselbaum. 



Genus 3. Leuconostoc Van Tieghem 1878, p. 198, emended 



Synonyms: Ascococcus Cienkowski 1878; not Ascococcus Colin 1875; 

 Leucocystisf Schroeter 1886. 



Saprophytes, usually growing in cane sugar solutions. Cells 

 in chains or pairs, united in large zoogleal masses. Some types 

 at least Gram negative. 



Type species, L. mesenteroides (Cienkowski) Van Tieghem. 



Genus 4. Streptococcus Rosenbach 1884a, p. 22, emended 

 Winslow and Rogers 1905, p. 669 



Synonyms: Sphaerococcus Marpmann 1885, not Sphaerococcus Ag- 

 ardh 1821; Arthrostreptokokkus Hueppel886; Perroncitoa Trevisan 1889; 

 Babesia? Trevisan 1889; Schuetzia Trevisan 1889; Lactococcus Beijerinck 

 1901; Hypnococcus Bettencourt et al. 1904; Myxokokkus Gonnermann 

 1907, not Myxococcus Thaxter 1892 ; Melococcus? Amiradzibi 1907; Dip- 

 lostreptococcus Lingelsheim 1912 



Chiefly parasites. Cells normally in short or long chains (un- 

 der unfavorable conditions, sometimes in pairs and small groups, 

 never in large packets). Generally stain by Gram. Capsules 

 rarely present, no zoogleal masses. On agar streak, effused 

 translucent growth, often with isolated colonies. In stab culture, 

 little surface growth. Many sugars fermented with formation 

 of large amount of acid, but inulin is rarely attacked. Generally 

 fail to liquefy gelatin or reduce nitrates. 



Type species is Streptococcus pyogenes Rosenbach. 



