Alnus milleri (Ettingsh.) Kovar-Eder

Plant Fossil Names Registry Number: PFN003330

Act LSID: urn:lsid:plantfossilnames.org:act:3330

Author: J. Kovar-Eder

Rank: species

Basionym: Tilia milleri Ettingsh.

Genus:

Reference for this name: Kovar-Eder, J. (2024): Plant diversity at the final stage of the Miocene Climate Optimum - Revision of the flora of Leoben, Styria, Austria. – Acta Palaeobotanica 264(2): 123–286.

Page of description: 179

Types for basionym

Original diagnosis/description

Blätter gestielt, rundlich, an der etwas ungleichen Basis ausge-randet oder fast herzförmig, an der Spitze kurz vorgezogen, am Rande ungleich gezähnt. Nervation randläufig, mit der von Tilia parvifolia fast vollkommen übereinstimmend, welcher die Blätter auch in der Größe und Form am meisten entsprechen. Als unterscheiden-des Merkmal dürfte aber hervorzuheben sein, dafs die von den unteren Secundärnerven abgehenden Außennerven bei der fossilen Art nicht randläufig sind, sondern Schlingen bilden, aus deren Bogen die in den Zähnen des Blattgrundes endigenden Nerven entspringen; ein Merkmal, welehes wir auch bei der Tilia mexicana finden.

Emended diagnosis

Petiolate small sized leaves; lamina up to 40 mm long, broad ovate–elliptic to orbiculate, more or less symmetrical, ratio l/w ~1–1.5; base mostly cordate; apex shape acute to acuminate; margin finely serrate, teeth narrow, (bluntly) acute, partly probably glanduliferous, almost equally sized or slightly bigger above secondary veins; up to 5 teeth in between teeth above secondaries; up to 8 pairs of secondaries, (semi-) craspedodromous, almost straight to moderately curved, diverging towards margin, one to several exmedial veinlets serving marginal teeth or joining in loops giving rise to veinlets running into teeth; tertiaries (forked-)percurrent; tufts at origin of secondaries in basal part of lamina.

Etymology

Ettingshausen (1869) devoted Tilia milleri to Prof. Albert v. Miller, who supported collecting at Leoben. Both men were friends.

Stratigraphy

Neogene, Miocene
Shales ~8.2 m above the coal seam (Ettingshausen, 1869a), 14.9 ± 0.7 Ma (a tuff layer near the base of the shales overlying the coal seam (Sachsenhofer et al., 2010).

Locality

Austria
Moskenberg near Leoben, Leoben Basin, Styria