. Contributions from the Osborn Botanical Laboratory. Plants. 366 Wuist: Br.\nched prothallia bearing other ; Lagerburg ('06) figured a slightly branched filamentous male gametophyte of Pteridium aquilinum (L.) Kuhn. Pace ('10) described branched filamentous prothallia of an unknown genus, and Black ('15) observed extensive branching among the filamentous prothallia of Onoclea sensibilis L. which had grown in a submerged condition in cultures of distilled Fig. I. Branched prothallia of Onoclea sensibilis L., X 125. Material The branched prothallia described in this pape
. Contributions from the Osborn Botanical Laboratory. Plants. 366 Wuist: Br.\nched prothallia bearing other ; Lagerburg ('06) figured a slightly branched filamentous male gametophyte of Pteridium aquilinum (L.) Kuhn. Pace ('10) described branched filamentous prothallia of an unknown genus, and Black ('15) observed extensive branching among the filamentous prothallia of Onoclea sensibilis L. which had grown in a submerged condition in cultures of distilled Fig. I. Branched prothallia of Onoclea sensibilis L., X 125. Material The branched prothallia described in this paper occurred in cultures which had been made for the study of the comparative length of the filamentous stage in various genera of the Polypodi- aceae. The genera which showed a tendency to branch were the ioWowing: Adiantum, Asplenium, Cafhptosorus, Onoclea, Phegopteris, Polypodium, Pteridium, Scolopendrium, Woodsia and Woodwardia. The spores of these various genera were obtained from several sources. Those of Adiantum were secured from the greenhouse of the botanical department, Cornell University, and those of Phegopteris came from a lawn in Ithaca, New York. The spores of Camptosorus and Scolopendrium. were collected in eastern New York by Mr. Ten Eyck Burr; while those of Asplenium, Onoclea,. 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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