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Quercus borissovii
Quercus borissovii Averyanova in Averyanova, Y.-W. Xing Bot. Zhurn. (Moscow & Leningrad), 105(1): 49. 2020
- Name
- Quercus borissovii
- Rank
- Species
- Generic Name
- [Genus] Quercus
- Replaced Name
- Quercus borissovii
- Authors (Name)
- Averyanova A. L.
- Authors (Pub.)
- Averyanova A. L.
Xing Y.-W.
- Publication
- Novye vidy pokrytosemennykh iz paleogenovykh otlozhenij Zajsanskoj vpadiny (vostochnyj Kazakhstan) [2020]
- Journal
- Botanicheskii Zhurnal
- Volume
- 105
- Issue
- 1
- Page number
- 49
- Year
- 2020
- Fossil Status
- leaves
- Stratigraphy
- Rupelian
- Location
- Kiin-Kerish Mountain, locality “Korablik”, Zaissan
Depression, Eastern Kazakhstan
- Paleoregion
- Eurasia (Central Asia)
Data for Holotypus
- Repository
- Komarov Botanical Institute, Russian Academy of Sciences, St.-Petersburg, Russian Federation
- Repository Number
- specimen No 322, collection
No 999A
- Diagnosis
- Leaves elliptic-ovate, 5.5–8 cm long
and to 2.7–4 cm wide with slightly cordate base. Margin
coarsely toothed, teeth obtuse with short acute
apex, apical side convex, rarely straight, basal side
long, convex, occasionally with small additional teeth;
sinuses rounded, rarely angular. Midvein up to 1 mm
in leaf base, thinning up to the apex. Secondary veins
in 5–6 pairs, straight in the lower part of the leaf,
slightly arcuate in the upper part, craspedodromous.
Angles of divergence of secondary veins decrease towards
the leaf apex. Tertiary veins sinuous or slightly
curved, diverge from secondary veins obliquely, or at a
right angle, often dichotomous.
