. Fig. 165.—Ustilago cri'.enia. 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 onlg in nutritive solutions. They produce a four-celled promycelium, on which few conidia are f
. Fig. 165.—Ustilago cri'.enia. 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 onlg in nutritive solutions. They produce a four-celled promycelium, on which few conidia are formed. Ust. sacchari Eabh. Dust-brand of cane sugar. This fungus injures the stems and heads of Saccharum officinale, S. cylindricum, and S. Eriantki 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 occurs
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