Dec. 3, 1917 
Podblight of Lima Bean 
483 
under natural conditions is considerably larger than those produced in the 
fall or in culture. Measurements made of the fall stylospores from the 
host vary from 11.7 to 31.0 n by 1.4 to 2.0 /z, average 22.83 by 1.73 jz, 
while those collected on February 7 varied from 20.6 to 54.4 /z by 1.38 
to 2.4 /z, average 32.44 by 2.0 /z. They are produced in culture on rice, 
corn meal, Irish potato cylinders, and stems of Melilotus alba and vary 
in length from 11.7 to 54.4 /z 
and in width from 1.38 to 
2,4 /z. 
The function of these bodies 
is not known. Repeated at¬ 
tempts have been made to 
germinate them but without 
success. Reddick (29) has 
suggested the possibility that 
they were paraph yses and 
Saccardo (31, p . 264) regards 
them as conidiophores. Von 
Hohnel (25, p. 526 ), described 
a new genus, Myxolibertiella, 
to include those species hav¬ 
ing stylospores and pycno- 
spores. He first placed the 
genus in the order Melanco- 
niales but later in the order 
Phomatales. Bub&k (2) and 
Diedicke ( 1 3) both regard 
them as spores. The latter 
investigator for convenience •^ 1Gm 7* — Diaporthe pkaseolorum: Mature hyphae. Note the 
designated the Phoma-like 
spores by the Greek letter alpha (a) and the stylospores by beta (/?), 
Shear (32), like Bubdk, Diedicke, and others, regards these bodies as 
spores and designates them as scolecospores. 
There is nothing peculiarly distinctive about the mycelium. It is 
hyalin, frequently branched, and septate. It varies considerably in 
width and is often supplied with enlargements which bear a slight re¬ 
semblance to chlamydospores. When young the cells are supplied with 
small protoplasmic granules. When the hyphae are old, the cells are 
filled more or less with oil globules or droplets (fig. 7). 
ASCOGENOUS STAGE 
Specimens of Lima beans consisting of stems and pods collected in 
October, 1914, and January 1, 1915, at Vineland, N. J., were wintered 
out at Washington, D. C., and covered over with dirt and leaves. These 
