. The British Charophyta. Characeae. Fio. 23.—Process of fertilisation, i, ii, iii. Upper part of oogonium of Chara vulgaris. iv. Oogonium of Nitella tenuissima. i. Half- matured unfertilised oogonium showing upper and lower cavities formed by development of coronula and enveloping cells, ii. Fully matured unfertilised oogonium showing tumid growth at the head of enveloping cells, and transverse fracture of membrane caused by their extended growth, iii. Antherozoids penetrating interstices formed by contracted terminations of spiral cells, and reaching oospore through upper and lower cavities
. The British Charophyta. Characeae. Fio. 23.—Process of fertilisation, i, ii, iii. Upper part of oogonium of Chara vulgaris. iv. Oogonium of Nitella tenuissima. i. Half- matured unfertilised oogonium showing upper and lower cavities formed by development of coronula and enveloping cells, ii. Fully matured unfertilised oogonium showing tumid growth at the head of enveloping cells, and transverse fracture of membrane caused by their extended growth, iii. Antherozoids penetrating interstices formed by contracted terminations of spiral cells, and reaching oospore through upper and lower cavities within, iv. Similar pro- cesses in development of oogonium of Nitella (after De Bary). above and below (Fig. 23 iii). The apex ,of each of these spiral-cells becomes slightly narrowed, leaving between them a triangul* space forming an aperture, admitting to the upper cavity already referred to. The aperture and cavity are filled with a colourless, soft, viscous jelly to which antherozoids from neigh-. 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 Groves, James; Bullock-Webster, George Russell, 1858- joint author. London, The Ray society
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherlondo, bookyear1920
