. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. CBYPrOGA3IS 181 plant bod}' is very thin and much expanded, and reaches a length of several feet. In most cases the plants are attached by more or less rootlike holdfasts. The often beautiful color is due to the presence of a red pigment, which more or less completely masks the chloropliyll. 434. Reproduction. —A cluiracteristic method of bearing- spores is ill groups of four (Fig. ^'JSJ^, eacli group result-
. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. CBYPrOGA3IS 181 plant bod}' is very thin and much expanded, and reaches a length of several feet. In most cases the plants are attached by more or less rootlike holdfasts. The often beautiful color is due to the presence of a red pigment, which more or less completely masks the chloropliyll. 434. Reproduction. —A cluiracteristic method of bearing- spores is ill groups of four (Fig. ^'JSJ^, eacli group result- ing from the division of the contents of an original mother cell. Such spores are termed tetraspores. They are briglit red bodies without cell walls, and being un- provided with cilia, are dependent upon water currents for dissemination. 435. Reproduction, with fusion of the reproductive cells, may be illustrated by the case of Nemalion; this being taken as a siinjde instance of a process which « in some members o ° a the o'roui) becomes liighly complicated. The rejiroductive cells of Nemalion are pollinoids, naked spherical cells pro- duced singly in rounded antlieridia (Fig. 300, a), and differing from an- therozoids only in being un ciliated; and egij celh U irnied witliin elongated cells termed carpo- gonia (Fig. 300, c). 300. NBiaalion: tlie carpngonium (o), ^'"^ ^'SE OCCUpies trichogyne (0 Willi pollinoids near, ami tlie enlarged Ijasal antlieridia (a); B, after fertilization, tlie . , carpogoniuni beginning to lirancli; C. tlie portion Ot tllO car- nearly niatvire spore-bearing body (cystu- pogonium, the hair- carp, c//).—Thuret. ,.,' , ., J like extremity oi whicli is known as the tnchofiyne (t). Several pollinoids, brought by circulation of the water, may adhere to the. of 21)1). fclnspoits (7) in a tiliiuent of Pnlysiplio- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readab
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1901
