. A manual of botany. Botany. PTBRIDOPHYTA—PILICIN^ 141 The sporangia, situated as described above, are usually quite independent of each other, not being arranged in sori. They are often embedded in the tissue of the sporophyll and open when ripe by valves or slits. Each contains numerous spores. The gametophyte is best known in Ophioglossiim pedun- culosum and Botrychium Lunaria. In the former it is a tuberous body growing underground and devoid of chloroplastids. From it springs a cylindrical gametophore, which grows up through the earth and becomes green. It bears antheridia and archegonia
. A manual of botany. Botany. PTBRIDOPHYTA—PILICIN^ 141 The sporangia, situated as described above, are usually quite independent of each other, not being arranged in sori. They are often embedded in the tissue of the sporophyll and open when ripe by valves or slits. Each contains numerous spores. The gametophyte is best known in Ophioglossiim pedun- culosum and Botrychium Lunaria. In the former it is a tuberous body growing underground and devoid of chloroplastids. From it springs a cylindrical gametophore, which grows up through the earth and becomes green. It bears antheridia and archegonia. In the latter it is again tuberous and subterranean; it has root hairs, and bears antheridia and archegonia, the latter being chiefly on its lower and the former on its upper surface. Maeattiaceae. The stem of the sporophyte, as in the last case, is generally a rhizome, which is sometimes branched, and bears numerous Fig. Fig. 899. Synaugia, s, of A, Angiopteris, E, Marattia ; c, section of synan- gium of E. After Sachs. leaves. The latter resemble those of the true ferns, from which they differ by bearing well-marked stipules. The roots branch considerably, the branching being lateral. The histology of the stem recalls that of the true ferns, the arrangement of the vascular tissue being polystelic, and the bundles of the steles concentric. There is more variety in regard. 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 Green, J. Reynolds (Joseph Reynolds), 1848-1914. London, J. & A. Churchill
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1895
