. Fio. 157.—Ustilago perennans on Arrhenatherum elating (Oat grass). The grains are transformed into black smut-masses ; the appearance of the infected spikelets is quite distinct from that of the healthy one to the right, (v. Tubeuf phut.) with Brefeld's view, that the fungus is introduced into fields with fresh farmyard manure. Kellermann and Swingle have found a smut on oats in America whicli tliey distinguish as Vst. avenue var. levis. Ust. KoUeri Wille. This is another species of oat-smut recently dis- tinguished ; it has smooth spores, and is said to cause even greater damage than Ust. a
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. Fio. 157.—Ustilago perennans on Arrhenatherum elating (Oat grass). The grains are transformed into black smut-masses ; the appearance of the infected spikelets is quite distinct from that of the healthy one to the right, (v. Tubeuf phut.) with Brefeld's view, that the fungus is introduced into fields with fresh farmyard manure. Kellermann and Swingle have found a smut on oats in America whicli tliey distinguish as Vst. avenue var. levis. Ust. KoUeri Wille. This is another species of oat-smut recently dis- tinguished ; it has smooth spores, and is said to cause even greater damage than Ust. avenae.