. Contributions from the Osborn Botanical Laboratory. Plants. 28 Brown: Apogamy in Phegopteris polypodioides cells in thickness, while the other was wider, only one cell in thickness, and with a broad notched apex. Series of short tracheids were formed in both the thickened region of the elonga- ted portion of the sporophyte and on its branch. Another out- growth, prothallus-like in form, developed from the margin of one wing of the prothallium and bore on its margin an antheri- Figs. 12-20 Fig. 15 shows an apogamous outgrowth which developed by the narrowing and lengthening of the apex
. Contributions from the Osborn Botanical Laboratory. Plants. 28 Brown: Apogamy in Phegopteris polypodioides cells in thickness, while the other was wider, only one cell in thickness, and with a broad notched apex. Series of short tracheids were formed in both the thickened region of the elonga- ted portion of the sporophyte and on its branch. Another out- growth, prothallus-like in form, developed from the margin of one wing of the prothallium and bore on its margin an antheri- Figs. 12-20 Fig. 15 shows an apogamous outgrowth which developed by the narrowing and lengthening of the apex of a prothallium one cell in thickness. It soon branched, one branch being very irregular in form and only one cell in thickness, while the other was elongated and several cells in thickness in the central region where it bore a group of long tracheids. A small side branch was given off from the apogamous 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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