Dicotylophyllum zubraense ( Drygant, 1998 ) Halamski, 2013

Halamski, Adam T., 2013, Latest Cretaceous leaf floras from southern Poland and western Ukraine, Acta Palaeontologica Polonica 58 (2), pp. 407-443 : 430

Dicotylophyllum zubraense ( Drygant, 1998) comb. nov.

Fig. 12A.

1998 Celastrus zubraensis ; Drygant 1998: 149, text−fig. 2, pl. 3: 4a, b. 2006 Celastrus zubraensis Drygant 1998 ; Mamčur 2006: 42, pl. 1: 4, 5.

Basionym : Celastrus zubraensis Drygant, 1998 .

Type (and only) material: Holotype, slightly incomplete leaf L PBK.35, 35a (formerly 37935, 37935A; part and counterpart).

Description.—Blade attachment marginal, laminar size microphyll (leaf ca. 4.8 cm long), laminar length to width ratio 2.7:1, laminar shape oblong, blade medially symmetric, basal insertion probably asymmetric, margin unlobed with serrate teeth. Apex not preserved, base angle probably obtuse, base shape convex.

Primary venation pinnate with probably (see Remarks) one basal vein and probably no agrophic veins. Major secondaries semicraspedodromous with possible intersecondaries. Major secondary spacing smoothly decreasing distally, their attachment decurrent. Higher order venation not preserved.

Tooth spacing regular with one order of teeth and about six teeth per cm. Sinus shape rounded, tooth shape biconcave. Principal vein is present and terminates at the tooth apex.

Remarks.—Preservation of the described material is unusual, with major and selected minor veins underlined by such heavy ferric oxide deposits so as to conceal probable original differences of their width, other veins having disappeared.

The shape and gross venation pattern of this enigmatic taxon are somewhat similar to those of some representatives of the Recent genus Casearia von Jacquin, 1760 ( Salicaceae or Flacourtiaceae ), especially C. guianensis (Aublet, 1775) Urban, 1902 or C. ilicifolia Ventenat, 1803 . As finer venation and cuticular characters are unknown and, moreover, teeth form is different, the Pidtemne specimen should probably be accommodated within a new form genus which cannot, however, be proposed at present for lack of sufficient material. Dicotylophyllum zubraense differs from all other taxa described herein under the generic name Dicotylophyllum in vein endings situated in teeth.