Elementary botany . 20. Fig. 221. Germinating uredospore of Germ tube entering the wheat rust. (After Marshall- leaf through a ). Fig. germi-nating, forming pro my-celium. Figs. 222-224.— Fig. mycelium of ger-minating teleutospore,forming graminis (wheat rust) Germinating sporidia entering leafof barberry by mycelium. (After Marshall-Ward.) FUNGI: RUSTS. 193 the leaves of the barberry, they germinate and produce the cluster cup plant has thus a very complex life history. Because of the presence ofseveral different forms in the lif
Elementary botany . 20. Fig. 221. Germinating uredospore of Germ tube entering the wheat rust. (After Marshall- leaf through a ). Fig. germi-nating, forming pro my-celium. Figs. 222-224.— Fig. mycelium of ger-minating teleutospore,forming graminis (wheat rust) Germinating sporidia entering leafof barberry by mycelium. (After Marshall-Ward.) FUNGI: RUSTS. 193 the leaves of the barberry, they germinate and produce the cluster cup plant has thus a very complex life history. Because of the presence ofseveral different forms in the life cyle, it is called a polymorphic fungus. The presence of the barberry does not seem necessary in all cases for thedevelopment of the fungus from one year to another. 409. Synopsis of life history of wheat rust. Cluster-cup stage on leaf of barberry. Mycelium between cells of leaf in affected (sing, spermagonium), small flask-shaped bodies sunk in upper side of leaf; contain spermatia.^Ecidia (sing, aecidium), cup-shaped bodies in under side or peridium, made up of outer layer of fungus threads which a
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Keywords: ., bookauthoratk, bookcentury1900, bookdecade1900, booksubjectbotany
