Orthogonospermum Manchester, Kapgate et S.Rob. in Smith, Kapgate, Robinson, Srivastava, Benedict & Manchester

Plant Fossil Names Registry Number: PFN001605

Act LSID: urn:lsid:plantfossilnames.org:act:1605

Authors: S. R. Manchester, D. K. Kapgate & S. Robinson

Rank: genus

Reference: Smith, S. Y., Kapgate, D. K., Robinson, S., Srivastava, R., Benedict, J. C. & Manchester, S. R. (2021): Fossil fruits and seeds of Zingiberales from the Late Cretaceous–early Cenozoic Deccan Intertrappean beds of central India. – International Journal of Plant Sciences 182(2): 91–108.

Page of description: 99

Type

Original diagnosis/description

Seeds rectangular in transverse section with 90° corners, about twice as broad as deep, rectangular in sagittal section, wide obovate or rounded rhomboidal in coronal section. Seed with two planes of bisymmetry. Surface with fine striations radiating spirally from the hilar scar. Flat lateral surface in coronal orientation but rounded convex on the other two lateral surfaces. Seed with cylindrical opercular channel terminated by a multilayered operculum. Micropylar collar absent but seed coat extremely thickened in the hilar half of the seed. Chalazal cavity present, lensoidal, with a thin partition separating it from the embryo cavity. Raphe canal prominent, passing longitudinally within the seed coat of a flattened face of the seed. The thick wall near the hilum is composed mainly of parenchyma tissue.

Etymology

Orthogon refers to the right-angle corners of the seed as viewed in transverse and sagittal sections, and spermum refers to the seed.