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Thesis (M.S.)—University of Nebraska—Lincoln, 1955. Department of Botany.


Copyright 1955, the author. Used by permission.


Various experiments were conducted on clonal members of Chara zeylanica. Temperature and length of day are secondary factors in determining the production of reproductive structures. Under the conditions of the experiment it appears that light intensity might be the primary factor. The requirements of Chara for phosphorus, nitrogen, and iron are low. Oogonia with fertilized ova are present in phosphorus-deficient solutions only. Calcium, magnesium, and sulfur are indispensable for successful development of the plants. Maximum vegetative growth is attained by plants growing under a yellow filter. Reproductive structures are produced on plants growing under a green filter and on control plants exposed to artificial light produced by incandescent bulbs.

Advisor: Robert C. Lommasson