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Hanskerpia
Genus Hanskerpia G.W. Rothwell, G.K. Mapes, Hern.-Castillo Taxon, 54(3): 734. 26 Sep 2005
- Name
- Hanskerpia
- Rank
- Genus
- Authors (Pub.)
- Rothwell G. W.
Mapes G.
Hernandez-Castillo G. R.
- Publication
- Hanskerpia gen. nov. and phylogenetic relationships among the most ancient conifers (Voltziales) [2005/9]
- Journal
- Taxon
- Volume
- 54
- Issue
- 3
- Page number
- 734
- Year
- 2005
- Parent Taxon
- [Order] Voltziales
- Fossil Status
- leafy twigs (with cones)
- Type
- Hanskerpia hamiltonensis
- Diagnosis
- Small conifer plants with two orders of determinate
plagiotropic lateral branches; forked leaves on penultimate
branches and simple, needle-like leaves on ultimate
branches. Stems eustelic with parenchymatous pith,
endarch primary xylem, abundant dense wood, and narrow
zone of periderm in parenchymatous cortex. Leaves
amphistomatic with parallel rows of stomata and single
vascular bundle. Compound ovulate cones/fertile zones
on penultimate shoots, bearing helically arranged forked
bracts and axillary ovuliferous dwarf shoots. Bract and
dwarf shoots fused at base, separate distally. Bilaterally
symmetrical ovuliferous dwarf shoots somewhat flattened,
bearing one to two narrow sporophylls interspersed
among numerous sterile scales. Megasporophylls
recurved at apex, each terminated by inverted
ovule with 180° rotational symmetry. Pollen cones
unknown. Prepollen monosaccate.
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