. The British Charophyta. Characeae. 18 BRITISH CHAEOPHYTA. divided, longitudinally in relation to the axis of the oospore, into three cells, the centre cell of which grows out as the primary root, while the two lateral cells form accessory roots. Further division takes place in the three cells, numerous accessory rhizoids and sometimes accessory pro-embryos (PI. II, f. 8 p') being produced. The primary root elongates con- siderably and forms nodes (PI. II, f. 8 rn.) at which rhizoids are produced. Rhizoids also originate at the first and sometimes at the second node of the pro-. JPiG. 1.—Succ
. The British Charophyta. Characeae. 18 BRITISH CHAEOPHYTA. divided, longitudinally in relation to the axis of the oospore, into three cells, the centre cell of which grows out as the primary root, while the two lateral cells form accessory roots. Further division takes place in the three cells, numerous accessory rhizoids and sometimes accessory pro-embryos (PI. II, f. 8 p') being produced. The primary root elongates con- siderably and forms nodes (PI. II, f. 8 rn.) at which rhizoids are produced. Rhizoids also originate at the first and sometimes at the second node of the pro-. JPiG. 1.—Successive development of root-node of Chara aspera (after Giesenhagen) (x o. 35). i. Koot-filament with curved septum u. forming " doubloTfoot" joint. ii. Dilation of " toe " of upper " foot" b. in. Toe-portion cut off by oblique septum forming separate cell c. iv. Subdivision of cell c into two cells by vertical septum d. v. Further subdivision into four cells by transverse septum e. vi. Two lower cells growing out into rhizoids//. embryo, and at the lower nodes of the sexual plant. The nodes of the rooting system differ from those of the stem-system (which will be described later) in being much simpler in construction and being primarily formed of the swollen ends of the long cylindrical cells of which the root-system consists. The early stages in the formation of a root-node are shown in Fig, 1 above. In the first place a curved. 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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