. The actinomycetes. Actinomycetales. 112 THE ACTINOMYCETES, Vol. II Sucrose nitrate agar: Growth at room temperature poor to fair, flat or slightly elevated. Margin smooth or scalloped, sec- toring frequent. Color pale buff to tawny, changing in some old cultures to brown with a lighter margin. Forms a compact surface layer, made up mostly of distinct palisades, and a submerged region of loosely arranged hyphae. Surface region frequently stratose in old cultures, with narrow, orange-colored layers. Sporangia fairly abundant in some cultures, not formed in others; spherical to irregular; frequ
. The actinomycetes. Actinomycetales. 112 THE ACTINOMYCETES, Vol. II Sucrose nitrate agar: Growth at room temperature poor to fair, flat or slightly elevated. Margin smooth or scalloped, sec- toring frequent. Color pale buff to tawny, changing in some old cultures to brown with a lighter margin. Forms a compact surface layer, made up mostly of distinct palisades, and a submerged region of loosely arranged hyphae. Surface region frequently stratose in old cultures, with narrow, orange-colored layers. Sporangia fairly abundant in some cultures, not formed in others; spherical to irregular; frequently beneath the surface in old cultures, owing to overgrowth by pali- sade hyphae. Sometimes a new layer of sporangia forms over the first layer. Odor slightly fragrant. Usually colors the agar pale yellow. Glucose-asparagine agar: Growth good to very good, consisting of a central area of elevated, fine convolutions, radial ridges or bumps, and a smooth area with radial grooves gradually sloping into the submerged margin. Surface moist-appearing and glossy. Color of center apricot-orange to brown, surrounded by an ochraceous-salmon or. Figuke 64. Streptosporangium roseum (Reproduced from: Couch, J. N. J. Elisha Mitchell Sci Soc. 71: 152, 1955).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Waksman, Selman A. (Selman Abraham), 1888-1973. Baltimore, Williams & Wilkins
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