Ephedra drewriensis Rydin, K.R.Pedersen, P.R.Crane et E.M.Friis
Plant Fossil Names Registry Number: PFN000588
Act LSID: urn:lsid:plantfossilnames.org:act:588
Reference: Rydin, C., Pedersen, K. R., Crane, P. R. & Friis, E. M. (2006): Former Diversity of Ephedra (Gnetales): Evidence from Early Cretaceous Seeds from Portugal and North America. – Annals of Botany 98(1): 123–140.
Page of description: 125
Illustrations or figures: figs 3A–K, 4A–D
Holotype PP44843, Paleobotanical Collections, Department of Geology, The Field Museum, Chicago, Illinois, USA
Figures: fig. 3A, J
Note: holotype: Drewry’s Bluff sample 198
paratypes: PP44844-PP44845, PP44878 (Drewry’s Bluff sample 198); PP44854, PP44866–PP44867 (Drewry’s Bluff sample 163); PP44874–PP44875 (Drewry’s Bluff sample 164)
Fossil seeds and in situ pollen with their general organization and structure as in modern Ephedra (nucellus surrounded by integument and outer sclerenchymatous envelope, long micropylar tube extending beyond the envelope, papillae on inner apical part of envelope, pollen exine shed during germination), and with the following defining features:
Seeds small, 1.2 and 1.4 mm long, 0.8–0.9 mm wide, ellipsoid with rounded base and short pointed apex. Attachment scar indistinct, rounded, approx. 0.15 mm in diameter. Sclerenchymatic cells of outer seed envelope narrowly rectangular, up to 70 μm long, longitudinally arranged. Pollen approx. 50 μm long, 20 μm wide, narrowly ribbed, six or seven ridges on exposed side (inferred total of 12–14 ridges).
Named from Drewry’s Bluff, where the fossils were found.
Cretaceous, Lower Cretaceous
Clayballs in Patuxent Formation, Potomac Group. Pollen Zone I, Early Cretaceous (early Aptian).
Drewry’s Bluff on the James River, south of Richmond, Chesterfield County, VA.
Plant fossil remain
macro- and meso-fossils-embryophytes except wood