Obirafructus Y.Kajita et H.Nishida in Kajita, Suzuki & Nishida

Plant Fossil Names Registry Number: PFN002732

Act LSID: urn:lsid:plantfossilnames.org:act:2732

Authors: Y. Kajita & H. Nishida

Rank: genus

Reference: Kajita, Y., Suzuki, M. H. & Nishida, H. (2021): A Multicarpellary Apocarpous Gynoecium from the Late Cretaceous (Coniacian–Santonian) of the Upper Yezo Group of Obira, Hokkaido, Japan: Obirafructus kokubunii gen. & sp. nov. – Acta phytotaxonomica et geobotanica 72(1): 1–21.

Page of description: 2

Type

Original diagnosis/description

Permineralized angiosperm reproductive shoot, consisting of a woody axis bearing a number of spirally arranged follicles. Axis in fruiting stage elongate, eustelic; vessels with scalariform perforation plates. Follicle elongate fusiform to falcate, tapering distally, dehiscing along ventral longitudinal suture; lateral surface transversely striate; placenta marginal. Dorsal midrib of follicle and each side of ventral suture ridged, 3-veined, 1 dorsal and 2 ventral. Follicle wall 3-layered, with pericarp, vascularized mesocarp, and fibrous sclerenchyma endocarp. Seeds numerous, flat, in 2 rows along ventral suture, one above the other. Seeds bitegmic, anatropous, winged; wing developed on upper side of main seed body. Seed coats 2, inner and outer; inner seed coat thin; outer seed coat constituting wing and lower fibrous layer. Nucellar wall thickened below endostome, forming a nucellar cap.

Etymology

The generic name comes from the town, Obira, where the fossil site is located.