Crassidenticulum trilobum Dilcher and Wang, 2006a

Wang, Hongshan & Dilcher, David L., 2018, Early Cretaceous angiosperm leaves from the Dakota Formation, Hoisington III locality, Kansas, USA, Palaeontologia Electronica (34 A) 21 (3), pp. 1-49 : 6

Crassidenticulum trilobum Dilcher and Wang, 2006a

Figure 4.2

Description. Leaf trilobate. Petiole up to 6.5 cm long and 1 mm wide. Sinus between lobes more than 80% of lamina length, structurally reinforced by lamina tissue. Margin toothed with angular sinus; five to ten serrations per cm with axes inclined to the tangent of the leaf margin; apical angle of tooth acute. Primary venation actinodromous; primary veins massive with straight course. Middle lobe base symmetrical whereas lateral lobe bases strongly asymmetrical. Secondary veins thin; angle of divergence moderate to wide acute; course of secondary veins uniformly curved before joining exmedial branches of superadjacent secondary vein forming intercostal regions irregular in shape and size; intersecondary veins common. Veins of secondary order or higher poorly preserved.

Number of specimens examined. 1.

Specimens illustrated. UF 15706-24677 ( Figure 4.2 ).

Occurrences. Braun Ranch and Hoisington III localities, Kansas.

Remarks. This species is common in the Braun Ranch locality, Kansas (Wang and Dilcher, 2006a). Though only one specimen is observed from the Hoisington III locality, a suite of characters, including trilobate leaf, massive multi-stranded primary vein, secondary venation pattern, and its chloranthoid tooth type are consistent with those described by Wang and Dilcher (2006a).

Figures

FIGURE 4. 1, Crassidenticulum decurrens (Lesquereux) Upchurch and Dilcher, 1990, UF15706-24648, fragment of leaf lamina. Note fine teeth on margin (indicated by arrow). Scale bar equals 2 mm. 2, Crassidenticulum trilobum Dilcher and Wang, 2006a, UF15706-24677, a trilobed leaf. Note thin and long petiole. Scale bar equals 1 cm. 3-4, cf. Crassidenticulum trilobum Dilcher and Wang, 2006a, UF15706-24684, a five lobed leaf (scale bar equals 1 cm) (3) and an enlargement of Figure 4.3 to show decurrent lamina tissue between two adjacent lobes (indicated by arrow) (scale bar equals 1 mm) (4).