. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. COMPAKATIVl. ( DATA. 81 I I 111 I: A I. DATA. Color gray-green, with scattered while to pink Bclerotia; reverse, sulphur-yellowish to pronounced salmon; color in media reddish or yellowish in special cases, others none. dor, none. Fifteen per cent gelatin in water, typical; liquefaction, none in 15 days, later very slow liquefaction; litmus reaction neutral, leaves both acid and alkaline media purple-blue. Potato agar and bean agar, typical, Blightly thinner t
. Cultural studies of species of Penicillium. Penicillium -- Cultures and culture media; Fungi -- Cultures and culture media. COMPAKATIVl. ( DATA. 81 I I 111 I: A I. DATA. Color gray-green, with scattered while to pink Bclerotia; reverse, sulphur-yellowish to pronounced salmon; color in media reddish or yellowish in special cases, others none. dor, none. Fifteen per cent gelatin in water, typical; liquefaction, none in 15 days, later very slow liquefaction; litmus reaction neutral, leaves both acid and alkaline media purple-blue. Potato agar and bean agar, typical, Blightly thinner than gelatin cul- tures, gray-green without sugar, clear green with cane sugar. Potato plugs, typical, transpires yellow drops which become very dark yellow (balsam). Ranlin's fluid, good colonies becoming rosy below. Cohn's solution, small colonies, fluid slightly yellow. Synthetic fluid (Dox's), carbon supplied as: Cane sugar, grew in solutions up to 30 percent with acid reaction. Lactose 3 percent, very slow growth of small character- istic colonies. Lactic acid oil per cent, good growth, light green. Levulose 3 per. Fig. 30.—rcnicillium : a, b, (/.branching of conidial fructifications (a X 1,400,6 and d,X 900); c, a single secondary verticil (xl,400); g, h, j, k, sketches of fructifications of various ages (X 140); m, n, o, germination of conidia (X 900). cent, very alow-growing but heavy colonies. Galactoses percent, typical. Glycerin, very small colonic-. Lutterfat, typical colonies. Milk, curdling ( per cenl calcium chlorid added) very slow; digestion, very slow; color in milk, none. At37°I ., grew more rapidly than check at 20° C. COMPARATIVE CULTURAL DATA. A summary !' accessory cultural data has already bees given for each species in connection with the descriptions. Many scries of culture- have been made with numerous media to obtain data as to the ability of the species studied to grow upon particular media or under particular conditions. It has been pos
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