Ginkgo cranei

Name

Ginkgo cranei

Rank

Species

Generic Name

[Genus] Ginkgo

Authors (Pub.)

Zhou Z.-Y. Quan C. Liu Y.-S.  

Publication

Tertiary Ginkgo ovulate organs with associated leaves from North Dakota, U.S.A., and their evolutionary significance [2012/1]

Journal

International Journal of Plant Sciences

Volume

173

Issue

1

Page number

69

Year

2012

Fossil Status

twigs (ovulate)

Stratigraphy

Paleocene

Strat. comment

Sentinel Butte Formation

Location

Almont, North Dakota, USA

Paleoregion

America (North)

Data for Holotypus

Repository

University of Wisconsin at Stevens Point, Stevens Point, USA

Repository Number

UWSP42706

Num

fig. 1A

Pub.

Tertiary Ginkgo ovulate organs with associated leaves from North Dakota, U.S.A., and their evolutionary significance [2012/1]

Data for Paratypus

Repository

Field Museum, Chicago, USA

Repository Number

PP34187

Num

fig. 1B

Pub.

Tertiary Ginkgo ovulate organs with associated leaves from North Dakota, U.S.A., and their evolutionary significance [2012/1]

Diagnosis

Ginkgo cranei is distinguished from Ginkgo biloba in its smaller seeds (seed 10–19 mm 3 12–17 mm vs. 30 mm 3 20 mm; stone 8–15 mm 3 7–12 mm vs. 21 mm 3 15 mm) and in having a characteristic seed integument cuticle consisting of epidermal cells with domelike, thickened periclinal walls and flange-developed anticlinal walls (instead of less bulging periclinal walls and less developed anticlinal wall flanges, as in the extant species). Stomata complexes are fewer and sparser than in G. biloba, mostly amphicyclic and with nonpapillate subsidiary cells, differing from those usually monocyclic and sometime with papillate subsidiary cells in the extant species. The leaves associated with G. cranei ovules can also be distinguished from G. biloba by having fewer stomata and less papillate epidermal and subsidiary cells.