. Botany for high schools. Botany. Fig. 307. Rear, side, and front views of fern spor- angium, d, e, annulus; a, lip cells. Dispersion of spores from sporangium of Aspidium acrostichoides, showing different stages in tl^.e opening and snapoing of the annulus. Fig. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910