Cunninghamia hornbyensis

Name

Cunninghamia hornbyensis

Rank

Species

Generic Name

[Genus] Cunninghamia

Authors (Name)

Brink K. S. Stockey R. A.  

Authors (Pub.)

Brink K. S. Stockey R. A. Beard G. D. Wehr W. C.  

Publication

Cunninghamia hornbyensis sp. nov.: permineralized twigs and leaves from the Upper Cretaceous of Hornby Island, British Columbia, Canada [2009/5]

Journal

Review of Palaeobotany and Palynology

Volume

155

Issue

1–2

Page number

90

Year

2009

Fossil Status

leafy twigs

Stratigraphy

Campanian

Strat. comment

Northumberland Formation

Location

Collishaw Point, Hornby Island, British Columbia, Canada

Paleoregion

America (North)

Data for Holotypus

Repository

Department of Botany, University of Alberta, Edmonton, Canada

Repository Number

P16103

Num

Plates I, 1,2–4,6; II, 4; III,1,3,5–7

Pub.

Cunninghamia hornbyensis sp. nov.: permineralized twigs and leaves from the Upper Cretaceous of Hornby Island, British Columbia, Canada [2009/5]

Data for Paratypus

Repository

Department of Botany, University of Alberta, Edmonton, Canada

Repository Number

P16104 (Plate I,5), P16105 (Plate II,1,2), UWBM9048(Plate II,3)

Num

Plate I,5, Plate II,1,2, Plate II,3

Pub.

Cunninghamia hornbyensis sp. nov.: permineralized twigs and leaves from the Upper Cretaceous of Hornby Island, British Columbia, Canada [2009/5]

Diagnosis

Twigs with helically arranged leaves. Leaves decurrent, narrow at base, dorsiventrally flattened, 21–50 mm long, 2–5 mm wide, 1.5 mm thick; apex acute. Pith of stems parenchymatous with scattered dark contents. Primary xylem endarch. Secondary xylem lacking resin canals; tracheids with non-contiguous, uniseriate, circular-bordered pits on radial walls; rays uniseriate, 1–10 cells high. Secondary phloem alternating bands of fibers and sieve cells. Leaf rhomboidal in transverse section; vascular strand single, centrally located, elongate band, 12–15 radial rows of tracheids wide and up to 7 tracheids thick; transfusion tissue in two wings on either side of vascular strand. Resin canals 1–5 per leaf; one large, central canal abaxial to vascular bundle, 0–4 smaller lateral resin canals. Palisade mesophyll inconspicuous; spongy mesophyll sometimes transversely elongated with scattered sclerenchyma fibers; hypodermis 1–4 cells thick, fibrous. Epidermis of rectangular cells; stomata sunken, predominantly adaxial, few abaxial.