Siphonodendron is an extinct genus of colonial rugose corals, common in the Lower Carboniferous (Mississippian) of Europe and North America. Colonies are fasciculate — built of slender, parallel corallites that often weather out of limestone as tangles of short tubes. Each corallite has a well-developed tabularium with distinct axial and periaxial zones.
Several species are important biostratigraphic markers and form extensive coral-rich biostromes in the limestones of shallow tropical seas. Glacial erratics from northern Britain frequently preserve such colony fragments.
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