J Integr Plant Biol. ›› 1981, Vol. 23 ›› Issue (6): -.

• Research Articles •    

Fimbriotheca tomentosa Zhu et Chen- a New Genus and Species from Permian of China and Its systematic position

Zhu Jia-nan and Chen Gong-xin   

Abstract: This paper has described a new genus and species on the basis of two pieces of fertile fern pinna specimens found from Tanshanwan Coal-bearing Formation in Dawangdian, Yangxin district of eastern Hubei Province. One of the specimens described here is an upper part of a pinna which is belt- shaped, entire, about 7 cm in length and 1 cm in breadth, acuminate, tomentose. Its midrib marked with an obvious ventral furrow, rather stout, approaching lmm in breadth. Lateral veins barely distinguishable, bifurcating once, about 12 veins per 1 cm margin of pinna. Spoangium finger-shaped, slightly curved, obtuse, without annulus, about 1.2 mm in length and 0.4 mm in diameter, rough. Synangium ovate or elliptic, 0.8 mm in diameter and 12 mm in length, consists of 5–6 sporangia, bearing 5–6 longitudinal ridges and furrows similar to those of such genera as Acitheca, Asterotheca, Ptychocarpus etc., but not free on upper part. Synangia of this new genus insert in a placenta which was developed by the end of each lateral vein spreading beyond the pinna margin. Synangium slightly contiguous with each other. Judging by the nature of the synangium this new genus probably belongs to the order Marattiales, quite possibly an indirect progeny from the genus Ilfeldia which has a common ancester with the genus Scolecopteris in phylogeny. According to the feature of the fossil plant society, the authors regard the geological age of the Tanshanwan Coalbearing Formation, in which Fimbriotheca tomentosa was found, as Early Upper Permian.

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