The INTERNATIONAL FOSSIL PLANT NAMES INDEX
Global registry of scientific names of fossil organisms covered by the International Code of Nomenclature for Algae, Fungi, and Plants and the International Code of Zoological Nomenclature © 2014-2024

IDNAME urn:idName:ifpni.org:species:20406034-9DDD-410B-B275-1EE2B3F5E88C species
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Alnus arasensis

Alnus arasensis Huzioka ex Tanai J. Fac. Sci. Hokkaido Univ., Ser. 4, Geol., 11(2): 279. 20 Mar 1961
Name
Alnus arasensis
Rank
Species
Generic Name
[Genus] Alnus
Authors (Name)
Huzioka K.  
Authors (Pub.)
Tanai T.  
Publication
Neogene floral change in Japan [1961/3]
Journal
Journal of the Faculty of Science of the Hokkaido University
Volume
11
Issue
2
Page number
279
Year
1961
Fossil Status
leaves
Stratigraphy
Miocene
Location
Aburato coal mine, Kamo-machi, Tsuruoka City, Yamagata Prefecture, Japan
Paleoregion
Eurasia (Japanese Archipelago)
Data for Holotypus
Repository
National Museum of Nature and Science, Palaeobotany Collection, Tokyo, Japan
Repository Number
UHR-15144
Diagnosis
Leaves elliptic-oval to oval in general outline, 5.5 to 6.3 mm Iong and 3 to 3.5 cm wide ; apex acutely pointed, somewhat aeuminate; base obtuse or rounded, sometimes obliquely truncate, very slightly deeurrent at the very base; midrib rather slender, nearly straight; secondary nerves slender, 8 to 11 pairs, opposite at the lower part and subopposite at the upper, diverging from the midrib at angles of 40 degrees on the middle part of blade, less at the upper part, 2 or 3 basal pairs short, diverging from the midrib at nearly right angles, all secondaries nearly straight, gently cvrving up near the margin, then entering marginal teeth ; a few tertiaries branching from secondaries near the margin, and entering into teeth ; tertiaries among intersecondary spaces very thin, irregularly percurrent; nervilles very thin, forming fine polygonal meshes; margin serrulate, with fine and acute teeth; nearly equal-sized; texture firm, membranaceous; petiole slender, about 7 mm long.

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