. Essentials of botany. Botany; Botany. THE BRYOPHYTES 275 (6) The blade, of thin-walled cells containing many chlorophyll grains. (c) The border, of strengthening cells, some projecting into teeth. Draw. 355. Minute Structure of the Gam- etophyte, Reproductive Portion.—• Dissect with needles, in water, on a slide, the tufts of leaves found at the tips of some sterns.^ Note: (a) The antheridia, oval sacs grow- ing from the enlarged tips; tips of the stem (see Fig. 201 for a single one mnch magnified). (b) The archegonia, flask-shaped structures arising from the tip of the the stem (Fig. 202).
. Essentials of botany. Botany; Botany. THE BRYOPHYTES 275 (6) The blade, of thin-walled cells containing many chlorophyll grains. (c) The border, of strengthening cells, some projecting into teeth. Draw. 355. Minute Structure of the Gam- etophyte, Reproductive Portion.—• Dissect with needles, in water, on a slide, the tufts of leaves found at the tips of some sterns.^ Note: (a) The antheridia, oval sacs grow- ing from the enlarged tips; tips of the stem (see Fig. 201 for a single one mnch magnified). (b) The archegonia, flask-shaped structures arising from the tip of the the stem (Fig. 202). (c) The sterile filaments inter- mixed with the sex organs (Fig. 202.) Are the antheridia and arche- gonia of Mnium cuspidatum borne in the same leaf tuft or separately? Draw (a), (&), and (c) in position. 356. Minute Structure of the Spo- rophyte. — Procure plants showing sporophytes in various stages of de- velopment. Draw a series of these, attached to the tips of the leafy stems from which they grow. Boil some stems with attached sporophytes in five-per-cent potash solution for a few minutes, rinse with water, care- fully pull out the sporophyte from the tip of the gametophyte, and 1 It will be of decided advantage also to study prepared microtome slides of longitudinal sections of these Fig. 200. Development of Sporo- phyte of a Moss {Funaria). A, a very early stage, showing the cell-divisions of the egg; B, the sporophyte lengthening rapidly and about to tear off the arche- gonium, which will be carried up as the hood of the spore-capsule. The base of the sporophyte is fas- tened to the tissues of the game- tophyte (leafy moss-plant), into which it is inserted for a consid- erable distance; a, archegonium; g, gametophyte; s, 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1908
