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Living and fossil megaspores produced by &laginella (Lycopsida) and its extinct ancestors form distinctive (and occasionally iridescent) exines. Ultrastructural studies of these spores have provided data that demonstrate a colloidal mode of development which in turn implies a degree of self-assembly in the construction of these exines. We present here experimental evidence in support of the theory of selaginellalean megaspore exine construction by depletion flocculation. Iridescent colloidal flocculations of polystyrene latex particles demonstrate an ultrastructural organization virtually indistinguishable from that of the biological system, and clearly demonstrate that self-assembly of complex Selaginella exines by a relatively simple construction process is plausible. 01996 The Linnean Sociehi of London

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