. Contributions from the Osborn Botanical Laboratory. Plants. 374 Wuist: Branched prothallia wall where the light conditions were good and the prothallium was not crowded by other prothallia. Fig. 9, A, shows a young branched prothallium of about twenty cells, which had formed a filament of three cells in the usual manner before the expanded portion of the prothallium developed. The second cell of this filament gave rise to a filamentous branch of three cells; the ter- minal one of which divided by two oblique longitudinal walls to form the beginnings of an apical cell. From the first cell of
. Contributions from the Osborn Botanical Laboratory. Plants. 374 Wuist: Branched prothallia wall where the light conditions were good and the prothallium was not crowded by other prothallia. Fig. 9, A, shows a young branched prothallium of about twenty cells, which had formed a filament of three cells in the usual manner before the expanded portion of the prothallium developed. The second cell of this filament gave rise to a filamentous branch of three cells; the ter- minal one of which divided by two oblique longitudinal walls to form the beginnings of an apical cell. From the first cell of the branch was cut off laterally a cell which would later develop into. Fig. 9. Branched prothallia of Asplenium Filix-femina (L.) Bernh., X 75- another branch. The expanded portion of the prothallium also gave rise to a short filamentous branch of two cells. In Fig. 9, B, a short filament of three cells was first formed by transverse divisions, then the third cell divided in such a manner as to form the beginnings of an apical cell. In the meantime a cell was cut off laterally from the first cell of the filament. By trans- verse and longitudinal divisions this branch developed becoming two cells in width and forming at the apex the beginnings of an apical cell. An extreme case of branching is shown in Fig. 9, C. A filament of three cells formed in the usual manner. From the. 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 Osborn Botanical Laboratory. [New Haven?] Osborn Botanical Laboratory, Yale University
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