. 'S«»fefc v.^ Fig. 21.âSync/iytrium solani. i, section through portion of a young potato sprout, showing many of the peripheral cells infected by the zoospores of the fungus. The central cell that is dividing has escaped infection ; 2, section through a portion of a scab, showing mature resting-spores deep down in the tissue and the youngest at the periphery; 3, a young resting-spore not yet enclosed in a thick wall ; 4, 5, and 7, mature resting-spores ; 6, a resting-spore germinat- ing, i-ciliate zoospores escaping. All highly mng. spore, containing the zoospores, was extruded, the zoospor
. 'S«»fefc v.^ Fig. 21.âSync/iytrium solani. i, section through portion of a young potato sprout, showing many of the peripheral cells infected by the zoospores of the fungus. The central cell that is dividing has escaped infection ; 2, section through a portion of a scab, showing mature resting-spores deep down in the tissue and the youngest at the periphery; 3, a young resting-spore not yet enclosed in a thick wall ; 4, 5, and 7, mature resting-spores ; 6, a resting-spore germinat- ing, i-ciliate zoospores escaping. All highly mng. spore, containing the zoospores, was extruded, the zoospores eventually escaping into the water. The epidermal cells are infected by the zoospore, which at first forms a naked mass of protoplasm that gradually increases in size, then becomes invested with a thin, colourless wall, upon which is eventually laid down a thick, brown, smooth, stratified, chitinous wall.
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Photo credit: © The Bookworm Collection / Alamy / Afripics
License: Licensed
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
