. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. PROTHALLUS 301 at the same time horizontal divisions in the middle region of the plate form the cushion, which is several cells thick. The green thalloid plant thus established is known as a prothallus, and when mature is usually heart-shaped, sometimes attaining a diameter of over a centimetre (Fig. 167). AU the cells are alike and contain chloroplasts. From the underside, especially. Fig. 1G7.—Fern-prothallus (magnified about thirty-five times), from the under-surface. A considerable number of autheridia (a
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. PROTHALLUS 301 at the same time horizontal divisions in the middle region of the plate form the cushion, which is several cells thick. The green thalloid plant thus established is known as a prothallus, and when mature is usually heart-shaped, sometimes attaining a diameter of over a centimetre (Fig. 167). AU the cells are alike and contain chloroplasts. From the underside, especially. Fig. 1G7.—Fern-prothallus (magnified about thirty-five times), from the under-surface. A considerable number of autheridia (an.) are seen, on the older part, and the projecting necks of twelve archegonia (ar.), in the region of the cushion, from which also numerous rhizoids (r.) arise, g-p-, growing point. in the region of the cushion, scattered superficial cells grow out as colourless rhizoids (r.), which serve for anchorage and the absorption of moisture. When the prothalli grow densely crowded, they often remain more or less filamentous, a condition which is normal for most of the Filmy Ferns. The prothallus is the Fern-plant (gamdophyte) that bears the organs. These are of the same general type 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
