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. Elementary botany. Botany. i6o MORPHOLOGY. takes place by gametes which are of unequal size, the smaller one repre- senting the sperm and the larger one the egg, as in E and F. These con-. Fig. 163. Chlamydomonas pulvisculus (Mull.) Ehrb, A, an old motile individual; M, nucleus; p, pyrenoid; s, red eye spot; v, contractile vacuole; B, motile indi- vidual has drawn in its cilia and divided into two; C, mother plant has drawn in its cilia and divided into four non-muJ;ile cells; D, pamella stage; E, female gamete —egg; F, male gamete —sperm; G, early stage of conjugation; H, zygo- spore with c

. Elementary botany. Botany. i6o MORPHOLOGY. takes place by gametes which are of unequal size, the smaller one repre- senting the sperm and the larger one the egg, as in E and F. These con-. Fig. 163. Chlamydomonas pulvisculus (Mull.) Ehrb, A, an old motile individual; M, nucleus; p, pyrenoid; s, red eye spot; v, contractile vacuole; B, motile indi- vidual has drawn in its cilia and divided into two; C, mother plant has drawn in its cilia and divided into four non-muJ;ile cells; D, pamella stage; E, female gamete —egg; F, male gamete —sperm; G, early stage of conjugation; H, zygo- spore with c Stock Photo
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The Book Worm / Alamy Stock Photo

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RE2NAN

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7.2 MB (251.2 KB Compressed download)

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3162 x 791 px | 26.8 x 6.7 cm | 10.5 x 2.6 inches | 300dpi

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. Elementary botany. Botany. i6o MORPHOLOGY. takes place by gametes which are of unequal size, the smaller one repre- senting the sperm and the larger one the egg, as in E and F. These con-. Fig. 163. Chlamydomonas pulvisculus (Mull.) Ehrb, A, an old motile individual; M, nucleus; p, pyrenoid; s, red eye spot; v, contractile vacuole; B, motile indi- vidual has drawn in its cilia and divided into two; C, mother plant has drawn in its cilia and divided into four non-muJ;ile cells; D, pamella stage; E, female gamete —egg; F, male gamete —sperm; G, early stage of conjugation; H, zygo- spore with conjugating tube and empty male cell attached. (After Wille.) jugate as in G and //, the protoplasm of the smaller one passing over into the larger one, and a zygospore is thus formed. 337. Of those which form colonies, Pandorina morum is widely dis- tributed and not rare. It consists of a sphere formed of si.xteen individuals enclosed in a thin gelatinous mem- brane. Kach cell possesses two cilia for flagella), which e.xtend from the broader end out through the envelop- ing membrane. By the movement of these flagella the colony goes roll- ing around in the water. When the plant multiplies each individual cell divides into sixteen small cells, which then grow and form new colonies. Reproduction takes place when the individual cells of the young colonies separate, and usually a small indi- vidual unites with a larger one and a zygospore is formed (see fig. 164). p- jg Eudorina elegans is somewhat similar, Pandorina morum (Mull.) Bory. I, but-when the gametes are formed cer- Tnotile colony; II, colony divided into . - ., n, ,i,-,.;j^ :„+.^ ^..-^-toor^ 16 daughter colonies; III, sexual colony, tain mother cells divide into sixteen gametes escaping; IV, V, conjugating jniall motile males or sperms, and gametes; VI, VII, young and old zvgu- j. i spore; VIII. zygospore forming a large certain other mother cells divide into swarm spore, which is free in IX; X, . , , ,-i f i ^,. ^

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