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Unformatted text preview: Sporophylls and Types of Sporangia A major advance in vascular plants is the development of the sporophyll, a modified leaf that bears sporangia. (Recall that the flower, the reproductive organ of the angiosperms, is a modified shoot system, and the floral parts, including anther (male sporangium) and ovary, enclosing the ovule (female sporangium), are modified leaves.) Sporangia in the vascular plants vary from single sporangia to clusters and groups of sporangia in specialized shoots. Type of sporangia is an important evolutionary distinction in plants. Plants that produce one type of sporangium are called homosporous. Other plants produce two different sporangia, megasporangia and microsporangia and are heterosporous....
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- Fall '09