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Reference.org
Strobilus
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<p>A strobilus (pl.: strobili) is a structure present on many land <a href="/facts/Plant/X5BMDMvS">plant</a> species consisting of <a href="/facts/Sporangium/WooSYxBC">sporangia</a>-bearing structures densely aggregated along a stem. Strobili are often called cones, but some botanists restrict the use of the term cone to the woody seed strobili of conifers. Strobili are characterized by a central axis (anatomically a <a href="/facts/Plant_stem/QlQWSzV4">stem</a>) surrounded by spirally arranged or <a href="/facts/Decussate/THJI9Mht">decussate</a> structures that may be modified leaves or <a href="/facts/Aerial_stem_modification/kPbAyltK">modified stems</a>. </p><p>Leaves that bear sporangia are called <i><a href="/facts/Sporophylls/dKjSP6dd">sporophylls</a></i>, while sporangia-bearing stems are called <i><a href="/facts/Sporangiophore/xuhBW2YJ">sporangiophores</a></i>. </p>