作 者 ：MA Qing-Wen, WANG Yu-Fei, CHEN Yong-Zhe, LI Cheng-Sen
期 刊 ：植物分类学报 1998年 2期
Keywords:Coniopteris tatungensis Sze, Jurassic, Reproductive structures, Beijing,
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.