215 
larger than in the preceding. External gelatinous coat. Tuber- 
cles small, spherical, comparatively few in number, 
Rhizobium Frankii, var. minus, n. s. 
Syn.: Same as preceding, 
Symbiotic with Pisum sativum. It is smaller; otherwise like 
the preceding. 
Rhizobium nodosum, n. s. 
Syn.: Same as preceding. 
Symbiotic with Dalea alopecuroides, Robinia Pseudacacia and 
Cassia Chamecrista. Cells of an irregular, knotted appearance. 
Protoplasmic contents often collected in lumps. Generally one or 
three, rarely two, spores situated at the ends, with one somewhere 
near the middle. Sometimes an encapsuled chain of spores. Gel- 
atinous zone present. Tubercles round, oblong or irregular, 
varying in size from that of a morphine pill to a large pea. 
Rhizobium dubium, n. s. 
Syn.: Same as preceding. 2 
Symbiotic with Amphicarpea comosa. General description 
corresponds with the preceding, only that it is somewhat smaller 
and the spores are not situated in contact with the end walls as 
in all the preceding; but small distances from them. Tubercles 
spherical, about half as large as a pea. Considerable starch in 
tubercles, i 
For better understanding of the above described species con- 
sult table of measurements and plate CXXX. 
TABLE OF MEASUREMENTS. 
LENGTH. WIDTH. 
yu KH 
Rhizobium mutabile in May, : : : 3-4 . 
“ “8 July, age 
“s curvum, . ; : : é es 6 
" Frankii, var. majus, . 8-3 
sane. pitas i 
nodosum . . v. Meaee is 
* 1.6-2.4 6 
aubium 
