Salix hausruckensis

Name

Salix hausruckensis

Rank

Species

Generic Name

[Genus] Salix

Authors (Name)

Kovar-Eder J. B.  

Authors (Pub.)

Kovar-Eder J. B. Wójcicki J. J.  

Publication

A Late Miocene (Pannonian) flora from Hinterschlagen, Hausruck lignite area, Upper Austria [2002/2]

Journal

Acta Palaeobotanica

Annee/Jahrgang

2001

Volume

41

Issue

2

Page number

229

Year

2002

Fossil Status

leaves

Stratigraphy

Tortonian

Strat. comment

Pannonian

Location

Tagebau Heissler near Hinterschlagen, Hausruck lignite area, Upper Austria, Austria

Paleoregion

Eurasia (Europe)

Data for Holotypus

Repository

Naturhistorisches Museum Wien, Geologisch-Paläontologische Abteilung, Vienna, Austria

Repository Number

1999B0001/9

Num

Pl. 2 fig. 6, Pl. 5, fig. 8

Pub.

A Late Miocene (Pannonian) flora from Hinterschlagen, Hausruck lignite area, Upper Austria [2002/2]

Diagnosis

Lamina wide elliptic, up to at least 150 mm long and 66 mm wide, relation length/width 1.7–2.5; petiole up to 47 mm long, often curved and basally broadened, adaxially clustered glands on the distal part of the petiole; leaf base sometimes somewhat cordate and slightly asymmetric, obtuse, rounded; apex acute, acuminate, sometimes attenuate; leaf margin regularly, simply serrate from the base up to the middle or twothirds of the lamina with glands adherent to the margin, apically often but not always entire; in small leaves only the base is serrate, then the margin is entire; teeth tiny, regularly spaced with rounded or acute bases and rounded apices; venation brochidodromous, distance between secondaries in the middle of the leaves 7–16 mm, in small leaves 3–4 mm, angles of origin at the base of big leaves between 70–90°, towards the apex about 40–50°, in smaller leaves generally 40–50°, secondaries forming wide curves, at the margin they form loops; loops of higher venation orders send fine veins towards the bases of the teeth from where these run along the apical sides of the teeth towards the teeth apices; tertiary veins forked percurrent, oblique; fourth order venation distinctive, polygonally reticulate, occasionally (forked-)percurrent between the tertiaries; fifth order veins forming polygonals, areoles with several branched veinlets; adaxial cuticle thick, cell-outlines sometimes formed of thick and straight-running anticlines, in other leaves the anticlines are hardly traceable on the thick cuticle; cell outlines commonly 4–6- sided, more rarely polygonal; trichome bases absent; size of non-modified epidermal cells (7)12–24 μm, average 16–18 μm; faint epicuticular striation upon veins and occasionally in intercostal areas; abaxial cuticle thick, nonmodified epidermal cells with thick anticlines, occasionally not equally developed, running straight, size of non-modified epidermal cells (7)11–28 μm, average 12–16(21) μm; stomatal complexes brachyparacytic to cyclocytic (especially the giant stomatal complexes); stomata oval, stomatal length 10(12)-30 μm, average 19–21 μm, width (7)12–22 μm, average 13–16 μm; stomatal aperture spindle-shaped, almost reaching the poles, outer cuticular ledges strongly thickened, aperture length (6)8–22 (25) μm, average 13–19 μm; epidermal walls of the guard cells sometimes well developed, sometimes hardly recognizable; giant stomata present, length >30 μm, aperture length 28–30 μm, sometimes radial striation present laterally; commonly the stomata show double contours; abundance of trichome bases variable: in some leaves almost restricted to the veins, in others also scattered in the intercostal areas; simple trichome pores, 4–15 μm in diameter, average 6–10 μm, surrounded by small, thickly cutinized cells, trichome bases raised volcano-like above the surface; faint striation upon main veins.