Lycophytes
Some members of both of the two modern classes of Lycopodiophyta (Lycopodiopsida and Isoetopsida) produce strobili. In all cases, the lateral organs of the strobilus are microphylls, bearing sporangia. In other lycophytes, ordinary foliage leaves can act as sporophylls, and there are no organized strobili.
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Strobili of Lycopodium
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Liquid-preserved strobili of Lycopodium, showing reniform sporangia through translucent sporophylls
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Strobili of Selaginella
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Liquid-preserved strobili of Selaginella, showing mega- and microsporangia through translucent sporophylls.
Read more about this topic: Strobilus