. College botany; structure, physiology and economics of plants. Botany. PTERIDOPHYTES 299 Stem, but they are made up of tissues â which are the same or similar tO' those of the Spermatophytes. The leaves (or fronds) (Figs. 144, 145, 146, 147, 148, 149) have a structure very similar to< that of the Spermatophytes. On the backs of the fronds will be found characteristic brown. Fig. 144.âDiagranunatic representation of the life history of the fern: (a) prothallium; (&') antheridium; (6") archegonium; (c'J sperm; (c") ovum; id) oospore; Ce) prothallus and young fern; (/) mature f
. College botany; structure, physiology and economics of plants. Botany. PTERIDOPHYTES 299 Stem, but they are made up of tissues â which are the same or similar tO' those of the Spermatophytes. The leaves (or fronds) (Figs. 144, 145, 146, 147, 148, 149) have a structure very similar to< that of the Spermatophytes. On the backs of the fronds will be found characteristic brown. Fig. 144.âDiagranunatic representation of the life history of the fern: (a) prothallium; (&') antheridium; (6") archegonium; (c'J sperm; (c") ovum; id) oospore; Ce) prothallus and young fern; (/) mature fern showing underground stem, root and leaf-bearing sori; ig) spo- rangium; ) spores. spO'ts which* vary in size and shape dependent on the species. They are known as sori (singular, sonis) and in most species are covered -with very thin membranes known as indusia (singular, indusium). These sori are composed of sporangia, which in the typical ferns are stalked bodies. They can be readily repre- sented by two watch glasses placed with their concave sides to-. 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 Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
