Studies on Coniopteris tatungensis of Jurassic from Western Hills of Beijing

Abstract

Abstract:

Coniopteris tatungensis is a common element in the Jurassic floras. This paper

deals with new collection of C. tatungensis from Beijing and reports the details of the repro-

ductive feature of this plant observed by SEM. The taxonomical assignment and geographical

distribution of C. tatungensis are discussed also in this paper. In C. tatungensis Sze.,

fronds at least 2～3 times pinnate, with main rachis slender. Pinnae alternate, linear to lin-

ear-lanceolate . The first pair of pinnules nearly opposite, others becoming alternate. First

pinnule on the acroscopic side of the penultimate pinnae well developed and divided into 2～ 3

lobes, while the first pinnule on the basiscopic side obviously weak, much smaller and nar-

rower, usually divided into 1～2 lobes. Reproductive fronds fully or partly fertile, the latter

with first pinnules on the acroscopic side bearing fewer sori. The lamina of pinnule strongly

reduced bearing an elliptical sorus distally. Number of sori mostly 1 per pinnule, but often 2

～3 at the basal part of penultimate pinnae. Indusia cup-shaped. Sori containing at least 12

sporangia. Sporangia shortly stalked, not all at the same age in a sorus. Sporangia rounded

to ellipsoidal. Annuli not complete, nearly vertical, consisting of about 15～20 thicked cells.

Spores rounded-triangular, trilete, laesurae reaching almost to equator.

Key words: Coniopteris tatungensis Sze, Jurassic, Reproductive structures, Beijing

MA Qing-Wen, WANG Yu-Fei, CHEN Yong-Zhe, LI Cheng-Sen. Studies on Coniopteris tatungensis of Jurassic from Western Hills of Beijing[J]. .

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Studies on Coniopteris tatungensis of Jurassic from Western Hills of Beijing

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