

1923] 



JENNISON — POTATO BLACKLEG 



41 



BRIEF CHARACTERIZATION 



1G0.1 Montana strain 53*2-32120-2111-2222- *211-22-121 



170.3 Montana strain 53 2-32120-2111-2222- 211-22-121 



180.2 Montana strain 53 2-32120-2111-2222- 211-22-121 



183.2 Montana strain 53 2-32120-2111-2222- 211-22-121 



187B.1 Montana strain 53 2-32120-2111-2222- 211-22-121 



191. B. phytophthorus 53 -51230- 333-1122- 322-33-322 



"as rec'd. from 



Appel." 



194. Maine strain 53 2-32120- 111-2222- 211-22-121 



Morse's "SE" 



195. Maine strain 53 2-32120-2111-2222- 211-22-121 



Morse's "IIP" 



196. B. solanisaprus 53 2-32120-2111-2222- 211-22-121 



Harrison 



197. B. atrosepticus 53 2-32120-2111-2222- 211-22-121 



van Hall 



198. B. melanogenes 53 2-32120-2111-2222- 211-22-121 



Pethy. & Murphy 

 201. B. phytophthorus 53 2-32120-2111-2222- 211-22-121 



Appel 



While all differences, great or small, have been recorded, it 

 is significant that these differences, except in the case of No. 191, 

 are insufficient to appear in the brief characterization of each 

 strain set down above. Such variations as may exist are, it 

 seems to me, wholly insignificant and do not justify even varietal 

 characterization. Within the limits of his comparative studies 

 Morse ('17) reached similar conclusions. Among his cultures 

 were some of the same strains used by the writer, namely, Nos. 

 194, 195, 196, 197, and 198. 



RELATIONSHIPS AND NOMENCLATURE 



Differences between the 4 "species" of the blackleg bacillus 

 as originally described may be noted by referring to the original 

 descriptions or to abstracts prepared by the writer (see p. 17 et 



seq.). 



The index numbers brought together below assist in visualiz- 

 ing the small differences upon which certain of these "species" 



were established. 



B. atrosepticus van Hall (van Hall, '02) 5312-32120-2121 



B. phytophthorus Appel (Appel, '03) 5?1?-32120-???1 



B. phytophthorus Appel (Smith, '10) 5312-32120-?212 



B. solanisaprus Harrison (Harrison, '07) 5312-32120-1212 



B. melanogenes Pethy. & Murphy (Pethybridge and 



Murphy, 10) 5312-32110-1111 



* Omission of figure indicates item not determined. 



