. Fig. 155.—Ustilago cruenta. Germin- ating .and sprouting conidia from a cultivation in plum-gelatine, (v. Tubeuf del.) whitish coat, which is easily torn, and, when the spores have escaped, a columella will be found to occupy the centre of the smut-mass. The stamens may also become filled with spores, and be externally more or less irrecognizable. As a rule, all the flowers of a head are smutty; if any escape, they remain more or less ; The spores, according to Brefeld, germinate only in nutritive solutions. They produce a four-celled promycelium, on which few conidia are fo
. Fig. 155.—Ustilago cruenta. Germin- ating .and sprouting conidia from a cultivation in plum-gelatine, (v. Tubeuf del.) whitish coat, which is easily torn, and, when the spores have escaped, a columella will be found to occupy the centre of the smut-mass. The stamens may also become filled with spores, and be externally more or less irrecognizable. As a rule, all the flowers of a head are smutty; if any escape, they remain more or less ; The spores, according to Brefeld, germinate only in nutritive solutions. They produce a four-celled promycelium, on which few conidia are formed. Ust. sacchari llabh. Dust-brand of cane sugar. This fungus injures the stems and heads of Saccharum officinale, S. ci/lindricum, and S. Erianthi in Italy, Africa, and Java. Ust. sacchari-ciliaris Bref. occurs on Saccharum ciliare near Calcutta. Ust. avenae (Pers.). The smut or brand of the oat
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