Streptomyces resistomycificus differs from the
strain 2A-327 in the color of its aerial mycelium
observed on various media, and also in the point
that it produces an aerial mycelium on nutrient
agar and a soluble pigment in glucose-asparagine
agar. S. mirabilis has a different form of aerial
mycelium and a different optimum temperature
from this strain. S. flavochromogenes produces
an aerial mycelium on nutrient agar and a grayish
soluble pigment iu this, whereas the strain 2A-
327 does not produce any aerial mycelium but