. Bulletin of the British Museum (Natural History), Geology. FROM THE DOWNTONIAN OF PODOLIA 193 egg-cell alone, which is the only part of the female organ that is homologous with the oogonium in other Algae (see Moll, 1934: 117; Smith, 1938: 130; Wood, 1947: 241; Fritsch, 1935). Egg-hud, the English equivalent of Sachs's term Eiknospe (see Oltmanns, 1922: 449)—an unexceptionable name for the female organ—has only recently been introduced (Maslov, 1947). The term 'lime-shell' (Groves & Bullock-Webster, 1920: 74) is used for the cal- careous wall of the fruit. It encloses the thickened oospo
. Bulletin of the British Museum (Natural History), Geology. FROM THE DOWNTONIAN OF PODOLIA 193 egg-cell alone, which is the only part of the female organ that is homologous with the oogonium in other Algae (see Moll, 1934: 117; Smith, 1938: 130; Wood, 1947: 241; Fritsch, 1935). Egg-hud, the English equivalent of Sachs's term Eiknospe (see Oltmanns, 1922: 449)—an unexceptionable name for the female organ—has only recently been introduced (Maslov, 1947). The term 'lime-shell' (Groves & Bullock-Webster, 1920: 74) is used for the cal- careous wall of the fruit. It encloses the thickened oospore membrane {Hartschale) which in turn encloses the mature ovum. The terms cellular and intercellular, as applied to the sculpturing of the lime-shell, have been defined by Peck (1934: 104). The use of these and other terms is illustrated in Text-fig. Text-fig. i. A. Trochiliscus [Eutrochiliscus) podolicus L. Devonian. Restoration of gyro- gonite in median longitudinal section, x 120. B. Chara hispida L. Fruit of Recent species in median longitudinal section in polarized light, x 70. () Cf. Groves & Bullock-Webster (1924: pi. 31, fig. 6). , apical opening; , basal opening; c, shrivelled remains of coronula; ca., cage, enclosing the winding cell, node-cell, and (?) stalk-cell; I., lime-shell; , oospore membrane; , outer waU of fruit; s., starch-grains, many of which have fallen away; , thickened lateral walls of spiral cells; , vesicular contents. The furrows on the lime-shell of Chara, and probably of Trochiliscus, are cellular, and the ridges intercellular. CHAROPHYTA Family TROCHILISCACEAE Genus TROCHILISCUS Karpinsky 1906 Groimds for rejecting the name Calcisphaera and for attributing the author- ship of the genus to Karpinsky are given by Peck (1934: 105). The status of the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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