1058 
Journal of Agricultural Research 
Vcl. XXX, No. 11 
Sugar-beet agar. — A. Growth simi¬ 
lar to that on oatmeal agar, except that 
the mat at the base of the slant against 
the glass is thicker and sharply out¬ 
lined; web present. 
B. As in oatmeal agar, except for 
the indefinite outline at base. 
D. As in oatmeal agar cultures, but 
more compact and appressed to slant, 
white at base, becoming deep olive 
buff at the tip where there is a persist¬ 
ent felty appressed mass. 
Bean agar. — A. First week’s growth 
prostrate, forming a smooth thick mat, 
finely granular on account of the 
abundant large conidia; aerial growth 
during second week, cobwebby hyphae 
plugging lower part of slant up to third 
of slant, the rest more closely appressed, 
forming an open dry film; flattens 
down during third week to a sodden 
prostrate mat, except for a few small 
dry patches of aerial mycelium on the 
upper part of the slant. 
B. Abundant aerial growth during 
the first week, plugging tube up to two- 
thirds of the way up the slant, more 
compact and felty at top of slant; dry¬ 
ing down after three weeks to form an 
appressed thin film. 
D. Aerial growth during first week, 
much more compact than B, flattening 
down to a thin dry film after three 
weeks. 
Potato cylinders. — A. Prostrate, 
sodden wet mat over lower part of 
cylinder, scanty growth at top. Short 
downy white aerial growth after four 
weeks, matting down again in three 
months. 
B. Abundant white aerial growth 
plugging part of the tube above slant 
within a week; becoming more com¬ 
pact in three weeks, entirely matted 
down in three months to a sodden 
glistening mass, with cobwebby strands 
from cylinder to glass. 
D. Thick, white, closely appressed 
aerial growth within a week, more com¬ 
pact than B, not plugging tube, mat¬ 
ting down in three months to a dry mat, 
dull. Smoke-gray to light grayish olive. 
Soyka rice slant.— A. Compact, 
felty white growth, closely appressed 
to slant, later flattening down to a dry 
white film. 
B. Abundant fluffy white growth 
plugging tube up to two-thirds of 
slant, flattening down after two weeks 
to a sodden mat. 
D. Closely appressed aerial growth, 
more compact than A, forming a dry 
white film. 
Bean pods. — A. Cobwebby film of 
mycelium covering pod and reaching 
to the glass, flattening down after 
two months to a sodden wet mat. 
B. Tubes plugged up to top of pod 
with thick white mass of hyphae 
during first week; this mats down 
within 11 days to form a thick wet mat 
over the surface of the pod and water, 
leaving a few cobwebby strands bear¬ 
ing drops of exudate. 
D. Early growth aerial, cottony, 
more compact than B, not 'plugging 
tube, remains aerial longer than B; 
mats down after three weeks. 
Sugar-beet cylinders. — A. Growth 
prostrate during first week, later 
aerial cobwebby to cottony in lower 
part, downy appressed at top; aftei 
three weeks flattening down to a 
sodden mat. 
B. Abundant aerial growth from the 
start, plugging the tube up to top of 
slant with a thick weft of cottony 
white mycelium which flattens down 
after three weeks to a wrinkled wet 
mat with occasional hyphae between 
cylinder and glass. 
D. Similar to B. 
Carrot agar. — A. Growth- pros¬ 
trate, finely granular (due to conidia), 
smoke gray; small compact white tufts 
at top of slant; thin wefts of cobwebby 
aerial mycelium at edges of slant. 
B. Abundant fluffy white growth, 
plugging tube four-fifths of the way up 
the slant; compact felty mass at tip; 
flattening down after three weeks, 
from base of slant upward to form a 
prostrate hyaline wet mat. 
D. Differs from B in the very com¬ 
pact, appressed white aerial growth, 
not plugging tube; felty, closely tex¬ 
tured at top, becoming cottony at the 
base; flattening down after a month 
to a thick dry mat. 
Potato dextrose agar. — A. Sim¬ 
ilar to growth on Garrot agar, except 
for the color, which is pale olive buff 
to fight grayish' olive; more pro¬ 
nounced aerial growth at edges of slant 
reaching to the glass. 
B. Similar to growth on carrot agar. 
D. Similar to growth on carrot agar, 
except that matting down takes place 
earlier in D than in B (two to three 
weeks), beginning at center and leaving 
cobwebby mycelium at the base and 
a smooth, closely appressed dry film 
at the tip. 
Potato agar, no dextrose. — A. 
Thick, prostrate, wet mat, uniformly 
granular, smoke gray to grayish olive, 
with slight felted aerial growth at upper 
half appearing after three weeks. 
B. Cobwebby white aerial growth 
appearing during first four days, mat¬ 
ting down within a week to form a 
prostrate gelatinous film, thickened at 
the base of the slant, pale smoke-gray 
to light grayish olive, aerial growth 
