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Aceroxylon pravalense
Aceroxylon pravalense S. Iamandei, E. Iamandei Acta Palaeontol. Roman., 2017, 13(2): 78. 16 Mar 2018
- Name
- Aceroxylon pravalense
- Rank
- Species
- Generic Name
- [Genus] Aceroxylon
- Authors (Pub.)
- Iamandei S.
Iamandei E.
- Publication
- New trees identified in the petrified forest of Middle Miocene from Zarand, Apuseni mountains, Romania [2018/3]
- Journal
- Acta Palaeontologica Romaniae
- Annee/Jahrgang
- 2017
- Volume
- 13
- Issue
- 2
- Page number
- 78
- Year
- 2018
- Fossil Status
- stems (wood)
- Stratigraphy
- Miocene
- Location
- răvăleni area from the left side of Prăvăleni valley at the confluence with Bodișteanu brook and Ociu area, Marinașu Valley, Zarand, Apuseni mountains, Romania
- Paleoregion
- Eurasia (Europe)
Data for Holotypus
- Repository
- Muzeul Național de Geologie, Institutul Geologic al României, București, Romania
- Repository Number
- 26,374
Data for Paratypus
- Repository
- Muzeul Național de Geologie, Institutul Geologic al României, București, Romania
- Repository Number
- 26,402
- Diagnosis
- Semi-ring-porous secondary wood with distinct growth rings, rays dilated at the ring boundaries. Vessels almost exclusively solitary or in rare tangential groups of 2-3 or radial multiples of 2-5 pores. The vessels have round, polygonal or radial oval shape, radial/tangential diameters have 40-75 / 30-65 μm, cellular wall thickness is 4-6 μm double wall and density of 68-146 vessels per mm2. Ver-tically the vessels have simple perforations, spiral thick-enings frequent and slightly tilted to nearly horizontal, alternating, hexagonal bordered pits, numerous, small, of 7-8 μm, with large apertures, of 5 μm. The vascular ele-ments of 88-182 μm length have large thin walled tyloses and colored crystals. The parenchyma is of apotracheal type, diffuse or as short lines and few paratracheal. Verti-cally it occurs in numerous strands of 6 rectangular cells or more, sometimes crystalliferous, or as large polygonal cells, attached to vessels, with numerous, opposite pit-ting. The rays have cells pitted on the horizontal walls and are fine to broad of 1-12(16) cells wide. The 1-4-seriates are not very high, and occur grouped around the thick rays of up to 16 cells, which are dissected by fasci-cles of some fibers, and have short endings of 1-3 cells. Ray frequency is of 8-10 rays on horizontal tangential mm. Radially are homocellular with cells all procumbent with variable height, of 11-20 μm, bearing 1-3 large, po-lygonal oval-rounded crystals, floating in a dark mass. In the cross-fields with vessels there are numerous, small pits of 2 μm in 1-2 horizontal rows arranged. The fibers with polygonal section, of 10-12 μm in diameter, with wide lumen, round to point like, with thick walls and rare spiral thickenings, small, numerously bordered pitted in a vertical row and sometimes septate.
