. Foundations of botany. len in many plants with inconspicuous flowers,as the evergreen cone-bearing trees, the grasses, rushes,and sedges, is a fine, dry powder. In plants with showyflowers it is often somewhat sticky or pasty. The formsof pollen grains are extremely various. Fig. 161 willserve to furnish examples of some of the shapes which Fig. IGO. — Modes of discharging Pollen. I, by longitudinal slits in the anther-cells(amaryllis); II, by uplifted valves (bar-berry); III, by a pore at the top of eachanther-lobe (nightshade). 1 See Kemer and Olivers Natural History of Plants, Vol. II, pp
. Foundations of botany. len in many plants with inconspicuous flowers,as the evergreen cone-bearing trees, the grasses, rushes,and sedges, is a fine, dry powder. In plants with showyflowers it is often somewhat sticky or pasty. The formsof pollen grains are extremely various. Fig. 161 willserve to furnish examples of some of the shapes which Fig. IGO. — Modes of discharging Pollen. I, by longitudinal slits in the anther-cells(amaryllis); II, by uplifted valves (bar-berry); III, by a pore at the top of eachanther-lobe (nightshade). 1 See Kemer and Olivers Natural History of Plants, Vol. II, pp. 86-95. 212 FOUNDATIONS OF BOTANY the grains assume ; c in the latter figure is perhaps ascommon a form as any. Each pollen grain consists mainlyof a single cell, and is covered by a moderately thick outerwall and a thin inner one. Its contents are thickishprotoplasm, full of little opaque particles and usuallycontaining grains of starch and little drops of oil. Theknobs on the outer coat, as shown in Fig. 161 h, mark.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplants, bookyear1901
