燕辽地区侏罗纪杉科一新属——燕辽杉

潘广

Pan Kuang

Received:1900-01-01 Revised:1900-01-01 Online:1977-05-18 Published:1977-05-18
Contact: Pan Kuang

Abstract:

A fossil plant, Yanliaoia sinensis gen. et sp. nov. of late Jurassic is described from

western Liaoning. It is an arborescent conifer, deciduous, with branchlets and leaves

resemble closely those of Sequoia sempervirens.. The form and structure of female

cones and cone scales are similar to those of extinct genus Elatides and living genera

Cunninghamia, Taiwania and Athrotaxis, The female cone, however, is smaller. Cone

scales are spirally arranged, woody, thin and ellipticzl, having a short spine at their

apex. Seeds, globuloidal, without wings, about ten on each scale, and longitudinally

arranged in three to four ranks, which occupy nearly the whole area of the ventral

surface of ovuliferous scales.

The author believes that Yanliaoa and Elatides are two closely allied genera,

evolved roughly in parallel with each other in the late Mesozoic. Yanliaoa may be

one of the ancestors of the living genera of Taxodiaceae. remarkablly the lineal or

sublineal ascendant of Sequoia sempervirens. The so-called “Sequoid jeholensis”

(Endos. 1951) may be a branchlet of Yanliaoa sinensis.

潘广. 燕辽地区侏罗纪杉科一新属——燕辽杉[J]. 中国科学院大学学报.

Pan Kuang. A Jurassic Conifer, Yanliaoa sinensis, gen. et sp. nov. from Yanlio Region[J]. .

可视化