Dicotylophyllum sp. 1

Halamski, Adam T., Kvaček, Jiří, Svobodová, Marcela, Durska, Ewa & Heřmanová, Zuzana, 2020, Late Cretaceous mega-, meso-, and microfloras from Lower Silesia, Acta Palaeontologica Polonica 65 (4), pp. 811-878 : 843-844

Dicotylophyllum sp. 1

Fig. 17H.

Material.—Rakowice Małe, Assemblage 5, upper Coniacian?–lower Santonian?: MB.Pb.2018/0076.1. Żerkowice, Assemblage 5, upper Coniacian?–lower Santonian?: MB.Pb. 2018/0058.

Description.— The better preserved specimen, MB.Pb.2018/ 0076.1 (Fig. 17H), is an incomplete microphyll leaf 26 mm long and 9 mm wide. Laminar shape approximately elliptic, blade medially symmetrical, base most probably rounded, apex straight. Primary venation pinnate; midvein stout, keeping approximately the same width from the base to the apex; secondaries excurrent, angle to midvein from 40–50° in the basal region to ca. 30° in apical region, densely spaced (ca. 9 per cm in the basal region, spacing weakly increasing distally), their course probably brochidodromous. Margin serrate, teeth ca. 9 per cm, regularly spaced, their proximal flank convex to straight, distal flank convex to concave. The other specimen is a leaf fragment with a similar margin.

Remarks.—This leaf differs from all other described herein in the tooth form. Dicotylophyllum sp. 3 sensu Halamski and Kvaček (2015) from the Coniacian of Krosnowice (Idzików beds) is similar in having closely spaced teeth, but ovate in shape.

Dicotylophyllum sp. 2

Fig. 17J.

Material.—Uncertain, Bolesławiec or Luisenhain, Assemblage 8, lower–middle Santonian: MB.Pb.2018/0053.

→ Fig. 17. Late Cretaceous angiosperms from the North Sudetic Basin, Lower Silesia, Poland. A. Monocotylophyllum sp. , leaf fragment MGUWr 5639p.b, “ Ulina ”, Assemblage 8 (lower–middle Santonian). B. Cinnamomoides sp. , incomplete leaf MB.Pb.2008/364, Rakowice Małe, Assemblage 4 (upper Coniacian?–lower Santonian?). C. Ternstroemites ? sp., incomplete leaf MB.Pb.2018/0045, Bolesławiec, Assemblage 8 (lower–middle Santonian), general view (C 2), enlargements showing margin (C 3), and venation (C 1). D. Araliaephyllum ? sp., incomplete leaf MGUWr 2704p, uncertain locality, Assemblage 6 (lower–middle Santonian). E. Dryandroides quercinea Velenovský, 1883 , incomplete leaf MB.Pb.2008/360, Bolesławiec, Assemblage 8 (lower– middle Santonian). F. Dalbergites sp. , leaf MB.Pb.2018/0023, Żerkowice,Assemblage 5 (upper Coniacian?–lower Santonian?). G, I. Salicites petzeldianus Goeppert, 1844 , leaves MB.Pb.2018/0054, 2018/0052, respectively, uncertain locality, Assemblage 8 (lower–middle Santonian). H. Dicotylophyllum sp. 1 , leaf MB.Pb.2018/0076.1, Rakowice Małe, Assemblage 5 (upper Coniacian?–lower Santonian?), general view (H 2) and enlargement of the margin (H 1). J. Dicotylophyllum sp. 2 , leaf MB.Pb.2018/0053, uncertain locality, Assemblage 8 (lower–middle Santonian).

Description.—The single available leaf is incomplete, preserved length 44 mm, estimated length 80 mm?, preserved width 22 mm. Blade elliptic in shape, base straight, apex not preserved. Margin entire. Venation pinnate camptodromous: proximal secondaries decurrent, distal secondaries excurrent; poorly preserved tertiaries departing from midvein between the leaf base and the first secondaries, otherwise tertiaries not observable.

Remarks.— Dicotylophyllum sp. 2 differs from Cinnamomoides sp. in the basal venation pattern (the departure of the proximal secondaries is closer to the base in the latter) and from Salicites sp. in the variable attachment of secondaries excurrent and decurrent within the same leaf) and greater length-to-width ratio.