. The British rust fungi (Uredinales) their biology and classification. Rust fungi. PUCCINIA POARUM 47 as shown in radial section. Tiie outer edge of each cell is more prolonged downwards so as to overlap a portion of the cell below in an imbricated manner. The secidium, in both, as is 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 Grove, W. B. (William Bywater), 1848-1938. Cambridge, University Press

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