Physiological Studies on Mosses. IV. Regeneration in Physcomitrium turbinatum

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Abstract
Studies were made of regeneration of gameto-phytic and sporophytic parts of P. turbinatum in Benecke''s nutrient soln. Detached leaves give rise to protonemata when placed in the nutrient medium. Development of protonemata is not confined to any particular portion of the leaf. Reduction in the amt. of leaf tissue to 1/2 or 1/3 has no well-defined influence on the regenerating activity of the cells. Attached leaves of greenhouse plants do not produce protonemata when submerged in the nutrient soln.. while leaves of water culture plants do produce protonemata when submerged. Defoliation of stems accelerates production of protonemata and branch shoots. Stems of both water culture and greenhouse plants react to an aquatic stimulus by developing protonemata. A calyptra, injured by cutting, developed protonemata, although similar uninjured structures failed to regenerate. Segments of young setae give rise to protonemata at their cut ends.

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