Baikalophyllum lobatumandRehezamites anisolobus: Two Seed Plants with “Cycadophyte” Foliage from the Early Cretaceous of Eastern Asia

2012 ◽  
Vol 173 (2) ◽  
pp. 192-208 ◽  
Author(s):  
Christian Pott ◽  
Stephen McLoughlin ◽  
Anders Lindström ◽  
Wu Shunqing ◽  
Else Marie Friis
Keyword(s):  
Early Cretaceous ◽  
Seed Plants ◽  
Eastern Asia

scholarly journals Species Pools of Seed Plants in Eastern Asia and North America.

1999 ◽  
Vol 24 (2) ◽  
pp. 292
Author(s):  
Gary Hannan ◽  
Shiyou Li ◽  
Kent T. Adair
Keyword(s):  
North America ◽  
Seed Plants ◽  
Eastern Asia ◽  
Species Pools

Anatomically Preserved Early Cretaceous Bennettitalean Leaves: Nilssoniopteris corrugata n. sp. from Vancouver Island, Canada

2014 ◽  
Vol 88 (5) ◽  
pp. 1085-1093 ◽  
Author(s):  
M. Madeleine Ray ◽  
Gar W. Rothwell ◽  
Ruth A. Stockey
Keyword(s):  
Early Cretaceous ◽  
Vascular System ◽  
Vancouver Island ◽  
Bundle Sheath ◽  
Seed Plants ◽  
Seed Plant ◽  
Internal Anatomy ◽  
Adaxial Surface ◽  
Plant Fossils ◽  
Entire Margin

Early Cretaceous fossilized leaves assignable to the extinct seed plant order Bennettitales occur within an exceptionally diverse Early Cretaceous (Valanginian) flora of anatomically preserved plant fossils at Apple Bay on Vancouver Island, British Columbia, Canada. One of the bennettitalean leaf types has an entire margin, with laminae that are attached near the adaxial surface of the midvein. Leaves are 10–15 mm wide with an adaxial surface that shows distinct corrugations, and a midrib that is exposed adaxially. The vascular system of the midrib consists of a crescent-shaped ring of collateral bundles. Lateral veins diverge from midrib at ∼90°, are typically simple but occasionally branch at base of the lamina. Vein density is 12–15 per cm. Leaves are hypostomatic with syndetocheilic stomata that are randomly oriented between veins. Internal anatomy consists of an adaxial hypodermis of closely-spaced isodiametric cells, mesophyll that is differentiated into adaxial palisade and abaxial spongy zones, and collateral bundles that show a distinct bundle sheath with bundle sheath extensions. This novel combination of characters represents the diverse bennettitalean genus Nilssoniopteris. Nilssoniopteris corrugata new species is only the second species of the genus for which internal anatomy is preserved. This species increases the known variation of bennettitalean leaf anatomy, and reinforces our appreciation for the global distribution of bennettitalean seed plants during the Mesozoic.

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