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Siphonospermum
Genus Siphonospermum Rydin, Friis BMC Evol. Biol., 2010, 10(183): 5. 17 Jun 2010
- Name
- Siphonospermum
- Rank
- Genus
- Authors (Pub.)
- Rydin C.
Friis E. M.
- Publication
- A new Early Cretaceous relative of Gnetales: Siphonospermum simplex gen. et sp. nov. from the Yixian Formation of Northeast China [2010/6]
- Journal
- BMC Evolutionary Biology
- Annee/Jahrgang
- 2010
- Volume
- 10
- Issue
- 183
- Page number
- 5
- Year
- 2010
- Parent Taxon
- [Order] Gnetales
- Fossil Status
- leafy stems (with reproductive organs)
- Type
- Siphonospermum simplex
- Diagnosis
- Erect stem with terminal units of reproductive structures. Leaves linear, opposite at node, with primary parallel venation. Reproductive units without
supporting bracts and terminal on median and lateral branches, narrowly ovoid with rounded base, extended acuminate apex, each consisting of one ovule, orthotropous and unitegmic. Ovules surrounded by an inner sclerenchymatous and an outer parenchymatous layer. Integument extended apically into a long thread-like micropylar tube.
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