Back
Polysporoxylon
Genus Polysporoxylon Doweld Geophytology, 54(2): 123. 9 Nov 2024
- Name
- Polysporoxylon
- Rank
- Genus
- Authors (Pub.)
- Doweld A. B.
- Publication
- Palaeoflora Europaea: Notulae Systematicae ad Palaeofloram
Europaeam spectantes III [2024/11]
- Journal
- Geophytology
- Volume
- 54
- Issue
- 2
- Page number
- 123
- Year
- 2024
- Parent Taxon
- [Family] Theaceae
- Fossil Status
- stems (wood)
- Type
- Polysporoxylon gordonioides
- Diagnosis
- Growth zones quite narrow.
Vessels thin-walled and narrow: 35-40(-50) μm,
exclusively solitary or at the beginning of the growth
zone sometimes in twos or threes in short radial
rows; transverse walls inclined and perforated in
the form of a ladder with up to 70 proliferations,
at the ends the perforations merge into a fiber with
bordered pits. The spots to the medullary rays
and the parenchyma ladder-shaped or horizontalelliptical;
those to the fibers are round bordered pits.
Axial parenchyma scanty paratracheal. Medullary
rays one to two, very rarely up to three cells wide,
homogeneous or heterogeneous. The single-row
medullary rays formed either by standing or lying
cells; the maximum height of the medullary rays is
sixteen cells; the spots on the fibers rounded; the
fibers thick-walled.
Links by generics
Species
