. Lessons in botany. Botany. Fig. 156. Base of leaf of isoetes, showing sporangium with macrospores. (Isoetes en- gelmannii). Fig- 157- Section of plant of Isoetes engelmanii, showing cup-shaped stem, and longitudinal sections of the sporangia in the thickened bases of the leaves. it is not uncommon to find both kinds in the same sporangium. When a sporangium bears only microspores the number is much greater than when one bears only macrospores. For a discussion of the club mosses (lycopodium and selagi- nella) and for a comparison of the ferns and fern-like plants, see the author's larger &qu
. Lessons in botany. Botany. Fig. 156. Base of leaf of isoetes, showing sporangium with macrospores. (Isoetes en- gelmannii). Fig- 157- Section of plant of Isoetes engelmanii, showing cup-shaped stem, and longitudinal sections of the sporangia in the thickened bases of the leaves. it is not uncommon to find both kinds in the same sporangium. When a sporangium bears only microspores the number is much greater than when one bears only macrospores. For a discussion of the club mosses (lycopodium and selagi- nella) and for a comparison of the ferns and fern-like plants, see the author's larger " Elementary Botany," Chapters XXVIII and 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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