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Mesocyparis rosanovii
Mesocyparis rosanovii Kodrul, Tekl., Krassilov Paleontol. Zhurn., 2006, (3): 94. 2006
- Name
- Mesocyparis rosanovii
- Rank
- Species
- Generic Name
- [Genus] Mesocyparis
- Authors (Pub.)
- Kodrul T. M.
Tekleva M. V.
Krassilov V. A.
- Publication
- Novyj vid khvojnykh Mesocyparis rosanovii sp. nov. (Cupressaceae, Coniferales) i problema transberingijskikh floristicheskikh svyazej [2006]
- Journal
- Paleontologicheskii Zhurnal
- Annee/Jahrgang
- 2006
- Issue
- 3
- Page number
- 94
- Year
- 2006
- Fossil Status
- leafy twigs (with cones)
- Stratigraphy
- Paleocene
- Location
- Arkhara village, Arkharo-Boguchanskoe brown coal mine, Amur region, Russian Federation
- Paleoregion
- Eurasia (Far East)
Data for Holotypus
- Repository
- Geological Institute, Russian Academy of Sciences, Moscow, Russian Federation
- Repository Number
- АВ1-233
- Diagnosis
- Branching shoots plagiotropous, opposite
and altemate, branches and branchlets arising in
the axils of lateral leaves, oЬliquely spreading. Leaves
persistent, decussate, scaly, dimorphic, оп penultimate
braпches at least twice loпger than on the ultimate. Facial
and lateral leaves approximately equal in length;
facial leaves flatly adpressed, thickened aloпg the midline,
typically keeled, apices acute to acuminate, thickened;
lateralleaves folded, decurreпt, free portion пarrowly
spreadiпg, acute, claspiпg facial leaves or subteпdiпg
the higher order branches. Leaves of axes
beariпg seed сопеs of опе type, decurreпt, distally free,
falcate. Leaves amphistomatic, stomata iп irregular
baпds on abaxial side of facialleaves, mostly oЬlique to
the midline. Stomata mопо- or (rare) amphicyclic, with
typically 5 subsidiary cells, which are iпdistinctly differentiated
iпto the polar and lateral, ofteп contiguous.
Trichomes as irregularly developed small pits on subsidiary
and ordinary cells.
Pollen cones up to 7 mm loпg, 1-4 mm iп diameter,
terminal on ultimate branchlets, consisting of 3-5 decussate
pairs of peltate microsporophylls. Peltae of microsporophylls
leaf-like, 1-2.2 mm loпg, 0.5-2 mm
wide, the larger (proximal) with stomata. Sporaпgia
abaxial, 2-5 at the base of peltae, globose to obovate,
0.~.5 mm long, 0.35-{).45 mm iп diameter. Pollen
about 20 /lШ iп diameter, spherical to slightly elliptical,
irregularly gemmate, germiпal area.
Seed сопеs erect, globose to оЬlопg, 3.5-5 mm loпg,
3-4 mm iп diameter, bome оп short stalks in 1-6 орроsite pairs in two side rows or decussate over а fertile
zones of penultimate axes, which is leafy above. Fertile
cone scales four in two decussate pairs, approximately
equal in size, woody, subpeltate, umbo subapical with
prominent, erect point. Seeds 3-5 per scale, inverted on
short funiculus, Ьilaterally winged.
