. Fig. 155.—UstUago cruenta. Gennin- ating and sprouting conidia from a cnltivation 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 form

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. Fig. 155.—UstUago cruenta. Gennin- ating and sprouting conidia from a cnltivation 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 Ilabh. Dust-brand of cane sugar. This fungus injures the stems and head's of Saccharum officinale, S. cglindricum, and >S'. Erianthi in Italy, Africa, and Java. Ust. sacchari-ciliaris Bref. occurs on Saccharum ciliarc near Calcutta. Ust. avenae (Pers.). The smut or brand of the oat occurs

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Keywords: ., bookcentury1800, bookdecade1890, booksubjectparasit, bookyear1897