262 The Botanical Gazette. (Jy, : 
amylodextrin bacteroids, while the smaller simple forms ber _ 
principally proteid bacteroids. H. Mdller takes exceptionty 
this statement also, while Frank?! refutes Miller's objection 
on the ground that Miller’s study was confined to the tuber 
cles of 7rifolium, while Frank’s announcement of a dimor 
phism related to the tubercles on Psum. : 
There are many different forms of bacteroids associated — 
with the tubercles of different species or genera of leguminow — 
plants. As noted above Schneider has based several species! — 
his Rkizobtum purely on these characters of form and the ' 
more or less definite localization of the protoplasm at variow — 
points of the accumulation of these highly. refringent and mot — 
readily stained bodies. ’ 
Morck, 122 while not describing them as species, figured mi — 
merous forms from tubercles of between forty and fifty specie 
of Leguminose. 
While these bacteroids are incapable of growth they ma 
represent to a certain extent morphological characters of the : 
organism within the tubercles. If this be true tt we 
strengthen the proposition suggested by different forms ® 
tained in artificial cultures that there are different varieti® : 
or races, of the organism. based | 
Schreeter123 describes two species of his Phytomyxa 1 
on the presence or absence of the strands in the meer 
Some investigations of Hellriegel, Laws and lp a 
mowski (I. c.), point to a probability that lupines willl 
velop tubercles when seeded with soil-extract hone a 
where lupines have not grown, while peas, etc., S& 
the same soil-extract develop the tubercles. es diffe — 
Beyerinck (I. c.) claims that in his artificial cultun neoogl 
ent races were obtained which remained true to form q 
Successive cultures. 1 a 
Nobbe, Schmid, Hiltner and Hotter*** found that i 4 
luteus inoculated with pea tubercle organiamil tubers 
from Robinia, Cytisus and Gleditschia, developed n° deve? = 
but when inoculated with lupine tubercle oF: i- 
121Ueber Miller’s Bemerkungen beziiglich der i 4 
der Erbse. Ber. deutsch. bot. Gesells. x (1892). 390399. ries det Lega : 
122Ueber die Formen der Bakteroiden bei den einzelnen 
sen. Inaug-Dissert. Leipzig, 1891. ve 
123 - i nf 
;kryPtogamen-Flora von Schlesien, 1 mincsen. 120 
tan der Legu 
peeeee 
suchs-Stationen xxx1x (1891). 227-359. 
