Origin and Development of the Ovule in Douglas-Fir
Abstract:Ovulate strobili can be recognized in coastal Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] in July, megaspore mother cells are evident by September-October, and ovules develop the following March. Meiosis takes place during the period of ovule formation. Some evidence is presented for a hypodermal origin of the megaspore mother cell. Details of later development of the ovule and its pollen-collecting mechanism are given.
Document Type: Journal Article
Affiliations: Director of Forestry Research, Weyerhaeuser Company, Centralia, Wash.
Publication date: December 1, 1963
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