. Botany of the living plant. Botany. A B A = Pollen-grains of Corn Cockle (Agrostemma) showing numerous possible points of origin for pollen-tubes, but only one tube, which penetrates at once a papillar cell of the stigma. B —a sinular condition in Mallow (Malva), but here numerous small tubes are formed for attachment, (.^fter Strasburger.) ( x 120.) with the moist cell-wahs, shows that they are also positively hydro- tropic (p. 128). These three factors are effective in deciding the /. Fig. 213, a. Pollen grains germinated in a nutritive medium, under a cover glasi, of which the margin is s
. Botany of the living plant. Botany. A B A = Pollen-grains of Corn Cockle (Agrostemma) showing numerous possible points of origin for pollen-tubes, but only one tube, which penetrates at once a papillar cell of the stigma. B —a sinular condition in Mallow (Malva), but here numerous small tubes are formed for attachment, (.^fter Strasburger.) ( x 120.) with the moist cell-wahs, shows that they are also positively hydro- tropic (p. 128). These three factors are effective in deciding the /. Fig. 213, a. Pollen grains germinated in a nutritive medium, under a cover glasi, of which the margin is shown. The tubes curve away from the margin, that^is, away from the supply of oxygen. (After Molisch.) Fig. 213, B. Result of culture of pollen-tubes of Narcissus Tazetta in neighbourhood of the style and stigma, in y per cent, sugar after i6 hours. Diagrammatic. (After Molisch.) (x lo.) course of the tube when it germinates normahy upon the stigma. They lead it to apply itself closely to the surface cells. On germination the contents of the pollen-grain pass over into. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bower, F. O. (Frederick Orpen), 1855-1948. London, Macmillan and co. , limited
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
