Riaselis E.M.Friis, P.R.Crane et K.R.Pedersen

Plant Fossil Names Registry Number: PFN000134

Act LSID: urn:lsid:plantfossilnames.org:act:134

Authors: E. M. Friis, P. R. Crane & K. R. Pedersen

Rank: genus

Reference: Friis, E. M., Crane, P. R. & Pedersen, K. R. (2019): Extinct Diversity among Early Cretaceous Angiosperms: Mesofossil Evidence of Early Magnoliales from Portugal. – International Journal of Plant Sciences 180(2): 93–127.

Page of description: 113

Type

Original diagnosis/description

Fruit/fruitlet indehiscent, with a thin wall; one seeded. Style lacking. Inner layer of fruit wall with narrow, elongate fibers. Stigmatic area restricted. Seed small, anatropous, bitegmic, and mesotestal-endotestal, with thick outer integument (testa) and thin inner integument (tegmen). Mesotesta one cell layer thick, composed of larger sclerenchyma cells. Endotesta several cell layers thick, composed of small polygonal cells with endoreticulate infillings. Seed surface coarsely rugulate. Micropyle formed from inner integument. Hilum and micropyle close together, not separated by testal tissue, resulting in a wide transversely oriented micropylar-hilar opening in the testa. Ovular vascular bundle continuing beyond the chalaza on the antiraphal side of the seed to the micropyle. Embryo tiny. Endosperm cellular, not-ruminate.

Etymology

Riaselis is an anagram of Serialis to indicate close similarity between the two genera.