. A handbook of cryptogamic botany. Cryptogams. SELAGINELLACE^' '49 The long-continued increase in thickness which distinguishes this genus alone among Vascular Cryptogams—except possibly Botrychium (Filices) —is dependent on an internal layer of meristem which surrounds the axial ' vascular' cylinder, and continually produces new layers of parent-. 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 Bennett, Alfred W. (Alfred
. A handbook of cryptogamic botany. Cryptogams. SELAGINELLACE^' '49 The long-continued increase in thickness which distinguishes this genus alone among Vascular Cryptogams—except possibly Botrychium (Filices) —is dependent on an internal layer of meristem which surrounds the axial ' vascular' cylinder, and continually produces new layers of parent-. 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 Bennett, Alfred W. (Alfred William), 1833-1902; Murray, George Robert Milne, 1858-. London, New York, Longmans, Green, and Co.
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