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Craspedodromophyllum acutum
Craspedodromophyllum acutum P.R. Crane Bot. J. Linn. Soc., 83(2): 107. 9 Nov 1981
- Name
- Craspedodromophyllum acutum
- Rank
- Species
- Generic Name
- [Genus] Craspedodromophyllum
- Authors (Pub.)
- Crane P. R.
- Publication
- Betulaceous leaves and fruits from the British Upper Palaeocene [1981/11]
- Journal
- Botanical Journal of the Linnean Society
- Volume
- 83
- Issue
- 2
- Page number
- 107
- Year
- 1981
- Fossil Status
- leaves
- Stratigraphy
- Paleocene
- Location
- Cold Ash Quarry, Newbury, Berkshire, England, U.K.
- Paleoregion
- Eurasia (Europe)
Data for Holotypus
- Repository
- Natural History Museum, London, U.K.
- Repository Number
- V.59801a
Data for Paratypus
- Repository
- Natural History Museum, London, U.K.
- Repository Number
- V.59792- V.59800, V.59802-59815
- Diagnosis
- Leaves elliptic to narrowly elliptic, 4G150 mm long and 1G50 mm
wide. Base acute, apex attenuate. Petiole proximally dilated, up to 26mm in
length. Secondary veins arising from the midrib alternately in 12-16 pairs, rarely
opposite. Angle of divergence 15-(25-35)-60 degrees. Distance between secondary
veins measured at the midrib 1-(4-11)-17 mm decreasing apically. Origin of
lowermost secondary vein supra-basal. Basal veins, thin, of tertiary order,
occasionally proximally contiguous with the margin. Tertiary venation percurrent,
alternate, rarely opposite; straight to slightly convex, branched and unbranched.
Mid-vein, tertiary angle 85-(95-110)-120 degrees. Quarternary venation
orthogonal forming irregular polygonal areolae.
Teeth non-glandular. Subsidiary teeth absent from the apex but increasing to
up to four basally. Secondary vein of primary tooth usually basally displaced.
Apical margin acuminate or concave, basal margin usually acuminate or convex.
Base of sinus with a well developed vein plexus, usually supplied by five tertiary
veins: the basal vein of the supra-adjacent tooth, the apical vein of the infraadjacent
tooth, branches from the supra- and infra-adjacent secondary, and a
branch formed by the merger of two tertiaries from the supra- and infra-adjacent
secondary. (Occasionally the plexus may be formed of four to six tertiary veins but
the general organization remains the same)
