. Fio. 21".—Section through a swelling on a sixteen-year twig of Juniper attacked by Gvmnosporancfium iu its eighth year; three conical spore-cushions are indicated, also a cushion-scar with the scar-tissue. (After Woerale.) Fig. 21 S.—Longitudinal section of a spore-cushion of Gymnosporonniinn cUi- viirinrfornu. Somewhat diagrammatic. (After Woernle.) and during rain swell up into long sporophores, containing long-stalked, spindle-shaped teleutospores, some thick- coated, some thin. The sporophores swell and ultimately form a common mass in which the teleutospores germinate.
. Fio. 21".—Section through a swelling on a sixteen-year twig of Juniper attacked by Gvmnosporancfium iu its eighth year; three conical spore-cushions are indicated, also a cushion-scar with the scar-tissue. (After Woerale.) Fig. 21 S.—Longitudinal section of a spore-cushion of Gymnosporonniinn cUi- viirinrfornu. Somewhat diagrammatic. (After Woernle.) and during rain swell up into long sporophores, containing long-stalked, spindle-shaped teleutospores, some thick- coated, some thin. The sporophores swell and ultimately form a common mass in which the teleutospores germinate. The spores have four germ-pores, each capable of giving off a promycelium with pointed sterigmata producing sporidia, which are cast loose and distributed by wind. Germination of sporidia takes place on leaves, cotyledons, petioles, and shoots of various Pomaceae, where they may induce swellings or curvature, often to a considerable extent.
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherl, booksubjectfungi
