. Morphology of gymnosperms. Gymnosperms; Plant morphology. Fig. 68 FiG 69 Fig. 68.—Bennettites Morien: longitudinal section of seed; a, micropylar tube; b, prismatic layer; c, pulpy tissue; d, "corpuscular" mass; e, interseminal scale; /, embryo space; g, remains of nucellus; h, chalaza; i, tubular envelope; k, micro- pylar canal; /, nucellar beak; m, pollen chamber; n, fibrous stratum; 0, basal expan- sion of n; p, pedicel bundle.—After Wieland's reproduction (22) of Lignier's figure (18). Fig. 69.—Cycadeoidea Wielandii: longitudinal section of seed; a, micropylar tube; b, expanded
. Morphology of gymnosperms. Gymnosperms; Plant morphology. Fig. 68 FiG 69 Fig. 68.—Bennettites Morien: longitudinal section of seed; a, micropylar tube; b, prismatic layer; c, pulpy tissue; d, "corpuscular" mass; e, interseminal scale; /, embryo space; g, remains of nucellus; h, chalaza; i, tubular envelope; k, micro- pylar canal; /, nucellar beak; m, pollen chamber; n, fibrous stratum; 0, basal expan- sion of n; p, pedicel bundle.—After Wieland's reproduction (22) of Lignier's figure (18). Fig. 69.—Cycadeoidea Wielandii: longitudinal section of seed; a, micropylar tube; b, expanded summit of interseminal scale; c, slightly palisaded layer of heavy- waUed cells, which forms the true external coat of the seed, but is covered in all the basal region of the seed by the woody and tubular cells of the cuplike extension (k) of the cortex of the seed pedicels; e, wall of nucellus ending below the chalaza in an expanded cup-shaped base; /, a structureless zone or simply a space between e and g; g, stringy remains of cells expanding into a cup below; h, chalaza; i, woody scalari- form tissue; k, continuation of the heavy-walled tubular' cells forming the outer layer of the seed pedicels, which overlaps the outer layer of the seed (c) and forms the cuplike seed support or husk; I, central bundle of pedicel; m, remnant of aborted seed arid micropylar tube at the center of summit of interseminal scale; X12—Figure and description after WiELAND 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 Coulter, John Merle, 1851-1928; Chamberlain, Charles Joseph, b. 1863; Coulter, John Merle, 1851-1928. Morphology of spermatophytes. Part I. Gymnosperms. Chicago, University of Chicago Press
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