. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 33° MICROSPORANGIA out into the leaf, whose detailed structure was much like that of many of the simpler Ferns. The root was similar to that of recent plants, possessing from two to eight xylem- groups. The microsporangia of Lyginopterh were borne on the under- side of pinnte, with much reduced laminee, and were more or less fused in pairs. The pinna, with its pendant elongated '<.V^. Fig. 189.—Photograph of transverse section of the stem of Lygiitopleris oldhamia (reproduced by the courtesy of Prof. F. W.
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. 33° MICROSPORANGIA out into the leaf, whose detailed structure was much like that of many of the simpler Ferns. The root was similar to that of recent plants, possessing from two to eight xylem- groups. The microsporangia of Lyginopterh were borne on the under- side of pinnte, with much reduced laminee, and were more or less fused in pairs. The pinna, with its pendant elongated '<.V^. Fig. 189.—Photograph of transverse section of the stem of Lygiitopleris oldhamia (reproduced by the courtesy of Prof. F. W. Oliver, ). Bs., leaf traces ; S., sclcrenchyma plates in outer cortex ; Sec, secondary wood ; A'., primary xylcm strand. sporangia, had somewhat of the appearance of an epaulet (Fig. 190). The sporangia produced numerous small spores, which were presumably convej/ed by the wind to the ovules, where they became lodged within the pollen chamber. Of their further fate nothing is known, but it is probable that they developed a small male prothallus, giving rise to spermatozoids, somewhat like those of Cycads. The ovules arose singly from the ends of truncated branches of the fronds, and showed the same plan of construction as in. 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 Fritsch, Felix Eugene, 1879-; Salisbury, E. J. (Edward James), Sir, b. 1886. London, G. Bell and sons ltd.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectpl, booksubjectplants
