. Contributions from the Osborn Botanical Laboratory. Plants. 372 Wuist: Branched prothallia Adiantum cimeatum Langsd. & Fisch.—Fig. 6, I-L. Branch- ing in this species occurred at an early stage in the development of the prothallia. The branches originated in the first cell of the filament and the growth in all cases was very rapid. In Fig. 6, L, is shown a pro thallium with a branch as long as the main filament. Adiantum trapeziforme L.—Fig. 7, A-G, represents branched prothallia of this species. Here branching was both dichotomous and monopodial. In Fig. 7, E, is shown an unusual case o
. Contributions from the Osborn Botanical Laboratory. Plants. 372 Wuist: Branched prothallia Adiantum cimeatum Langsd. & Fisch.—Fig. 6, I-L. Branch- ing in this species occurred at an early stage in the development of the prothallia. The branches originated in the first cell of the filament and the growth in all cases was very rapid. In Fig. 6, L, is shown a pro thallium with a branch as long as the main filament. Adiantum trapeziforme L.—Fig. 7, A-G, represents branched prothallia of this species. Here branching was both dichotomous and monopodial. In Fig. 7, E, is shown an unusual case of dichot- omous branching where both branches tended to grow in the same Fig. 7. Branched prothallia of A. trapeziforme L., X 125. Camptosoriis rhizophyllus (L.) Link.—Fig. 8, A-D, shows branched prothallia of this species which developed on the distilled water cultures, while Fig. 8, E, shows a prothallium which developed on the inner surface of the pot wall of the soil cultures. Fig. 8, A-D, shows the beginnings of branching in very young prothallia. Branching in two of the cases was dichotomous and in the other two cases monopodial. A few days after the spores were sown on the distilled water, germination took place in the normal manner. In Fig. 8, A, the first prothallial cell instead of dividing by a trans-. 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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