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Quillworts

MALE SPORES OF A QUILLWORT Like Selaginella, quillworts are heterosporous which means that they have two kinds of spore instead of just one. Having male and female spores of different size is a feature of more highly evolved plants. This picture shows a section through a microsporophyll of a quillwort. Microspores are the tiny male spores. [CH] {FG}
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