Elements of Structural and Systematic Botany

he Red Alg?

t available. Nevertheless, enough can be done with dried material to get a good idea of their general appearance, and the fruiting plants can be readily preserved in strong alcohol. Specimens, simply dried, may be kept for an indefinite period, and on being placed in water will assume perfectly the appearance

ng like Cladophora; others form cell plates comparable to Ulva (Fig. 30, C, D); while others, among which is the well-known Irish moss (Chondrus), form plants of considerable size, with pretty well differentiated tissues. In

ven the larger red seaweeds. They are most abundant in the warmer seas, but still a conside

stages in the development of the tetraspores, × 150. D I, II young procarps. tr. trichogyne. iii, young; iv, ripe spore fruit. I

a specific example, and preferably one of the simpler o

is extremely delicate, collapsing completely when removed from the water. The color is a bright rosy

ay be mounted for examination eithe

er cell of the tetraspores arises as a small bud near the upper end of one of the ordinary cells (Fig. 29, C i). This bud rapidly increases in size, assuming an oval form, and becoming cut off from the cell of the stem (Fig. 29, C ii). The contents now divide into four equal parts, arranged like the quadrants

l organs, and subsequently the sporocarps, or fruits, developed from them. The plants that bear them are usually stout

arp arises from a single cell of the filament. This cell undergoes division by a series of longitudinal walls into a central cell and about four peripheral ones (Fig.

ter to convey it to the neighborhood of the procarp. Occasionally one of these spermatozoids may be found attached to the trichogyne, and in this way fertilization is effected. Curiously enough, neither the cell which is immed

xual organs and spores as well. The tetraspores are often imbedded in the tissues of the plant, or may be in special receptacles, nor are they always arranged in the same way as here described, and the

(with smaller alg? attached). C, Grinnellia. D, Deless

running water, attached to stones and woodwork, but are much inferior in size and beauty to the m

hospermum, × about 12. B, a branch of th

are Batrachospermum a