Sphenopsida | Sphenopsida Characteristics and structure | What is Sphenopsida | Horse tails |

Sphenopsida | Sphenopsida Characteristics and structure | What is Sphenopsida | Horse tails |

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SPHENOPSIDA

Plants belonging to this group are
also called arthrophytes because the whole plant body is composed of large number of joints. Main
stem is not smooth, it has large number of ridges and furrows. Each node has whorl of branches.
The sporangia are born on structures called sporangiophores, aggregated to form strobili.
In Sphenopsida (Horsetails), the sporophyte is diferentiated into root, stem and leaves. The leaves
may be expanded or scale-like and are always arranged in whorls.
Each sporangiophore has a slender stalk and an expanded disc at its free end. The sporangia appear
on the underside of the disc.
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