. Plant life, considered with special references to form and function. Plant physiology. Fig, 239- Fig. 237- ~Ay the " flower " of a seed plant {Zaniia Diuric^tta). It is composed of crowded sporophylls, of wliich one is represented in /->' as seen from the side. It has a stalk capped Dy a hexagonal top, s. with numerous sporangia, x, on ihe under side. A , natural size. t>, magnified about 6 diam.—After Karsten. Fig. 238.—A bit of a section of the wall of a sporangium of a horsetail, Tlie cells of the outer layer thicken their walls along spiral lines. The two inner layers of
. Plant life, considered with special references to form and function. Plant physiology. Fig, 239- Fig. 237- ~Ay the " flower " of a seed plant {Zaniia Diuric^tta). It is composed of crowded sporophylls, of wliich one is represented in /->' as seen from the side. It has a stalk capped Dy a hexagonal top, s. with numerous sporangia, x, on ihe under side. A , natural size. t>, magnified about 6 diam.—After Karsten. Fig. 238.—A bit of a section of the wall of a sporangium of a horsetail, Tlie cells of the outer layer thicken their walls along spiral lines. The two inner layers of cells, t, become disorganized at maturity of the sporangium. Magnified 250 diam.^After Campbell. Fig. 239.—Two spores of a horsetail (£'^?c/j'^/«;« arvense\\ one showing the elaters open, as when dry, the other with them coiled, as when moist. Magnified 25 diam.— After 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 Barnes, Charles Reid, 1858-1910. New York, H. Holt & company
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectplantphysiology
