Developmental potentialities of leaf primordia of Osmunda cinnamomea. VI. The expression of P1

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Abstract
Data from culture experiments presented strongly suggest that the development of leaf primordia at the shoot apex may be divided into three phases in Osmunda cinnamomea. Phase I lasts from inception (Im) to some point in time during P1. Phase II probably begins somewhere between Im and I1, and may be retained as long as P9. Phase III is evident as early as P1 and continues through the entire primordial sequence to include Pn. In nature, or under experimental conditions where physiological continuity between the primordium and shoot apical meristem complex is maintained, O. cinnamomea primordial expression is phase III expression (leaf only). However, if the primordia produced at the shoot apex are removed from certain external biological influences (specifically the shoot apical meristem and certain older primordia) terminal expression of the primordia may be either phase I, phase II, or phase III depending upon the developmental phase of the primordia at the time of their isolation.

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