. Contributions from the Botanical Laboratory, vol. 11. Botany; Botany. FROTOPLASMA Volume XX Plate III. CONWAY ZIRKLE Verlag von Oebriider Borntraeger in Leipzig. 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 University of Pennsylvania. Botanical Laboratory; University of Pennsylvania. Morris Arboretum. Philadelphia : [s. n. ]

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