. Essentials of botany. Botany; Botany. 274 ESSENTIALS OF BOTANY 353. The Protonema.— Look in the neighborhood of patches of moss for a felt-like network of green threads covering the ground. It is most readily found on the earth of flower-pots in greenhouses. Mount some filaments in water and examine with Compare with Fig. 199. Invert a patch of moss in a plate with water, cover. prim Fie. 199. Protonema of a Moss. prim, primary shoot; h, a young root-hair; pZ, young moss-plant; br, branches olprimary shoot. with a bell-glass in a sunny place, and note any changes that may after some wee
. Essentials of botany. Botany; Botany. 274 ESSENTIALS OF BOTANY 353. The Protonema.— Look in the neighborhood of patches of moss for a felt-like network of green threads covering the ground. It is most readily found on the earth of flower-pots in greenhouses. Mount some filaments in water and examine with Compare with Fig. 199. Invert a patch of moss in a plate with water, cover. prim Fie. 199. Protonema of a Moss. prim, primary shoot; h, a young root-hair; pZ, young moss-plant; br, branches olprimary shoot. with a bell-glass in a sunny place, and note any changes that may after some weeks occur in the appearance of the exposed rhizoids. Explain. 354. Minute Structure of the Gametophyte, Vegetative Portion. — Examine with a microtome section of the stem near the base. Note: (a) The central strand of small cells. (b) Intermediate tissue of larger tliin-walled cells, followed near the exterior by thicker ones. (c) The epidermis. (d) The rhizoids (not present on the upper parts of the stem) springing from the epidermis. Draw. Examine a leaf with 2-inch objective and then with Note : (a) The midrib, of mechanical 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 Bergen, Joseph Y. (Joseph Young), 1851-1917. Boston, Ginn
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