. Essentials of botany. Botany; Botany. THE ALG^ 231 296. Gross Structure. â Examine some fresh or preserved material and note: (n) The size, shape, and textui'e of single plants, the mode of branching, and the slimy coating of the entire plant. (6) The location of the air-bladders. (c) The mode in â which the plant is attached to the rock by an expanded holdfast. (d) The enlarged fruiting tips, or re- ceptacles, of some branches. Draw. The growing' point is in a pit at the tip of each branch. 297. Reproduction. â Study the recep- tacles of different plants, cutting some of them across, and no
. Essentials of botany. Botany; Botany. THE ALG^ 231 296. Gross Structure. â Examine some fresh or preserved material and note: (n) The size, shape, and textui'e of single plants, the mode of branching, and the slimy coating of the entire plant. (6) The location of the air-bladders. (c) The mode in â which the plant is attached to the rock by an expanded holdfast. (d) The enlarged fruiting tips, or re- ceptacles, of some branches. Draw. The growing' point is in a pit at the tip of each branch. 297. Reproduction. â Study the recep- tacles of different plants, cutting some of them across, and note that there are two kinds, differing in shape and in the external color and color of the contents. With a two-inch objective or a magnifying glass sketch a cross-section of each kind of receptacle showing the distribution of the conceptacles (Fig. 164), each opening by a pore to discharge its contents. Pick out with the point of a scalpel the contents of a conceptacle of each kind and examine with ^NTote: (a) The sterile hairs. (J) The sac-shaped antheridia borne on branching hairs (Fig. 162). (c) The nearly spherical oogonia, large cells from each of which eight eggs are developed.^ Observe that while the conceptacle shown in Fig. 164 contains both antheridia and oogonia, those of Fucus vesiculosus contain only one kind of sex organ. 1 Prepared slides with stained sections of conceptacles may be studied to Fig. 161. Part of Thallus of a Rockweed {Fucus platy carpus). (Natural size.) The two uppermost branch- lets are 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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