. Contributions from the Osborn Botanical Laboratory. Plants. 370 Wuist: Branched prothallia the filament usually gave rise to the expanded portion of the pro- thallium. In both of these cases the branches originated in the third cell of the filament. In Fig. 2, J, the group of cells at the apex between the branches indicate that there will be a continu- ation of the main growth of the prothallium. In Figs. 2, K, and 3, L, M, dichotomous branching developed at a slightly later stage after the first divisions of the expanded portion of the prothallia had been formed. Fig. 4, N-Q, show single la
. Contributions from the Osborn Botanical Laboratory. Plants. 370 Wuist: Branched prothallia the filament usually gave rise to the expanded portion of the pro- thallium. In both of these cases the branches originated in the third cell of the filament. In Fig. 2, J, the group of cells at the apex between the branches indicate that there will be a continu- ation of the main growth of the prothallium. In Figs. 2, K, and 3, L, M, dichotomous branching developed at a slightly later stage after the first divisions of the expanded portion of the prothallia had been formed. Fig. 4, N-Q, show single lateral branches which appear to have originated at about the same period in the de- velopment of the prothallia as the dichotomous branches shown in Figs. 2, K, and 3, L, M. Fig. 5, R, S, shows branches de- veloped from the expanded portions of the prothallia. In Fig. 5. Branched prothallia of Onoclea sensibilis L. R-T, X 125; U, X 75. 5, R, the branch formed a plate of cells while in Fig. 5, S, it tended to assume a filamentous character. Fig. 5, T, shows another case of dichotomous branching but at a later stage in the development of the prothallium. Here it occurred at the apex of the expanded region of the young prothallium. Fig. 5, U, is unique in that the branch appears to have originated in the first, second and third cells of 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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