Sphenophytes
The single extant genus of Equisetophyta, Equisetum, produces strobili in which the lateral organs are sporangiophores. Developmental evidence and comparison with fossil members of the group show that the sporangiophores are reduced stems, rather than leaves. Sporangia are terminal.
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Strobilus of Equisetum
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Strobilus of Equisetum
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Liquid-preserved strobilus of Equisetum, showing sporangiophores
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Cross-section of liquid-preserved strobilus of Equisetum, showing sporangiophores bearing sporangia
Read more about this topic: Strobilus