390 GENEEAL SYSTEMATIC BACTERIOLOGY 



The same description was used by Magnin (1880, p. 96). Myco- 

 nostoc according to Van Tieghem (1884) consisted of spiral cells 

 embedded in gelatin. 



Winter (1880, p. 60) gave the following description: 



Fiiden sehr diinn, farblos, ungegliedert, aber beim Eintrocknen in kurze cylin- 

 drische Glieder zerfallend, verschiedenartig gebogen und durch einander ge- 

 schlungen, von Gallerte umgeben, die rungliche Kugeln von 10-17^ (und mehr) 

 Durchmesser bildet. Vermehrung durch Einschnlirung und Zweitheilung dieser 

 Gallertkugel, 



Schroeter (1886, p. 169) gives the following diagnosis: 



Zellen in Form diinner, gebogener und gewundener Faden, welche in eine rund- 

 liche Gallertcyste eingeschlossen sind. Die Faden zerfallen in ktirzere Stiicke. 

 Die Cysten vermehren sich durch fortgesetzte Zweitheilung. 



Hansgirg (1888, p. 265) includes the genus as the sole genus of his 

 family Myconostocaceae, and notes finding the organism among algae 

 in Bohemia, and frequently among his algal cultures. 



The genus is accepted by De Toni and Trevisan (1889, p. 1034), 

 Trevisan (1889, p. 26), Billet (1890, p. 24) and Ludwig (1892). 



Migula (1900, p. 960) made Myconostoc the second subgenus under 

 his genus Spirosoma. 



The genus is rejected by Erwin F. Smith (1905) and by most recent 

 writers. It is proposed by Vuillemin (1913, p. 526) as one of his 

 "Formogenera conservanda." 



If the organism described by Cohn is worthy of generic recognition, 

 Myconostoc is a valid bacterial genus. 



Myconostocaceae. The second family of the order Eubacteria pro- 

 posed by Hansgirg (1888, p. 265) in the following statement: 



Diese noch von Schroter mit der Familie der Bacteriaceen vereinigte Spaltpilz 

 gruppe, welche der Familie der Nostoceen unter den Spaltalgen entspricht ist 

 aus ahnlichen Griinden wio die Crenothrichaceae zu einer den tibrigen Familien der 

 Bacterien gleichwerthigen Familie zu erklaren. 



A single genus, Myconostoc, is recognized. 



Myconostoceae. A subtribe created by Trevisan (1879, p. 139) to 

 include the genus Myconostoc. He gave the following characteriza- 

 tion: "Somatia substantia intersomatiari in colonias mucosas con- 

 sociata, eramosa." This is the second subtribe included within his 

 tribe Vihrionieae. 



