. Fossil plants : for students of botany and geology . Paleobotany. 224 THALLOPHYTA. [CH. leaf-node. The tips of the investing cells project at the apex in the form of a terminal crown or corona (fig. 45, E, c). The antheridia have a complex structure, and produce a very large number of motile Fig. 45. A and B. Chara Knowltoni Sew. From a section in the British Museum. G. Stem of Chara foetida A. Br. in transverse section (after Migula. X 18). D. Interior of oogonium of G. foetida. E. Oogonium of G. foetida {D and E after Migula. x 50). After fertilisation, the egg-cell becomes
. Fossil plants : for students of botany and geology . Paleobotany. 224 THALLOPHYTA. [CH. leaf-node. The tips of the investing cells project at the apex in the form of a terminal crown or corona (fig. 45, E, c). The antheridia have a complex structure, and produce a very large number of motile Fig. 45. A and B. Chara Knowltoni Sew. From a section in the British Museum. G. Stem of Chara foetida A. Br. in transverse section (after Migula. X 18). D. Interior of oogonium of G. foetida. E. Oogonium of G. foetida {D and E after Migula. x 50). After fertilisation, the egg-cell becomes surrounded by a membrane, at first colourless, but afterwards yellow or brown. The inner cell-walls of the cells surrounding the oospore become thicker and darker in colour; the outer walls remain thin and eventually fall away. The lateral walls may or may not become thickened. In most of the Chareae a calcareous deposit is formed between the hard shell and the outer walls of the cells enveloping the oospore. This calcareous shell is developed subsequently to the thickening and hardening of the inner. 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 Seward, A. C. (Albert Charles), 1863-1941. Cambridge : University Press
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishercambr, bookyear1898
