. Contributions from the Botanical Laboratory of the University of Pennsylvania. Plants; Plants -- Pennsylvania. Fig. 2. Longitudinal sections (X300) of epidermal cells of root tip. 1. C. maculata 2. P. rotundifolia F = free hyphal filaments, S = sheath. separated by a pseudoparenchyma, much like that seen in Monotropa. There is apparently no invasion of any layer beneath the epidermis. Kramar (44) has described all stages of the growth of the mycorhiza. The walls of the epidermal cells first become infested with hyphae forming a pseudoparen- chyma between the cells. Later, when the epidermal
. Contributions from the Botanical Laboratory of the University of Pennsylvania. Plants; Plants -- Pennsylvania. Fig. 2. Longitudinal sections (X300) of epidermal cells of root tip. 1. C. maculata 2. P. rotundifolia F = free hyphal filaments, S = sheath. separated by a pseudoparenchyma, much like that seen in Monotropa. There is apparently no invasion of any layer beneath the epidermis. Kramar (44) has described all stages of the growth of the mycorhiza. The walls of the epidermal cells first become infested with hyphae forming a pseudoparen- chyma between the cells. Later, when the epidermal cells become full size the hyphae penetrate the cell wall, make direct for the nucleus and begin to form a ball around it. The nucleus finally becomes hypertrophied and lifeless. When this occurs and the cell is packed full of hyphae they penetrate the cell wall again and spread out over the surface. Before this occurs. 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. Philadelphia : University of Pennsylvania Press
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