中文摘要：

现生铁角蕨Asplenium Linn．种类繁多，广布于热带一温带地区，以热带一亚热带为分布中心。确切的Asplenium Linn．化石最早出现于东亚和俄罗斯远东地区的下白垩统地层中，是西伯利亚一加拿大区白垩纪的新生分子。根据吉林延边地区下白垩统长财组发现的铁角蕨化石的营养羽片和生殖羽片标本，在原位孢子研究基础上，通过与现生铁角蕨植物繁殖器官的对比，确认当前材料属于Asplenium．Linn．；并进一步与国内外相关属种进行比对，建立了一个新种——长财铁角蕨（新种）（Aspleniumchangcaium SunetLiu，sp．nov．）。该新种原位孢子的研究为深入探讨铁角蕨属乃至铁角蕨科的系统演化奠定了基础。

英文摘要：

The living family of Aspleniaceae might be one of the biggest families of ferns. The Genus among it is diversified and widely distributed in tropical-temperate zones, especially in the tropical and subtropical areas which is recognized as the distribution center. Confessed earliest fossil specimens of Asplenium Linn. were found from Lower Cretaceous of Northeast Asia and Far East of Russia, being one of the new elements in Cretaceous in the - fertile Siberian-Canadian Phyto-geographic Realm. Based on the comparative studies of in situ spores between the frond fossils collected from the early Cretaceous Changcai Formation in Yanbian area of Jilin, China, and the living fertile fronds of Asplenium trichomanes L. , the fertile frond fossils and its sterile frond fossils are definitely assigned to the genus Asplenium L. Furthermore, through the comparison to the known species of fossil Asplenium, a new species of Asplenium is recongnized, i. e. Asplenium changcaium Sun et Liu, sp. nov. Since the well preserved spores in situ of the present new species, it would be beneficial for the researches on the evolution of Asplenium, or even Aspleniaceae. The new species is described as follows： Order ： Filicales ; Family ： Aspleniacea ; Genus ： Asplenium Linn. , 1753 ; Species ： Asplenium changcaium Sun et Liu, sp. nov. （Fig. 2-1 - 8, Fig. 3-1 - 7） Holotype： The specimen JLC030344 illustrated on Fig. 2-1 has been chosen as holotype. Paratype： Both the specimen JLC030359 illustrated on Fig. 2-5 and the specimen JLC030447 illustrated on Fig. 2-7 are chosen as paratypes. Additional specimen： JLC030343, JLC030345, JLC030346, JLC030348, JLC030442, JLC030358, JLC030356, JLC030443, JLC030353. Repository： the Research Center of Paleontology and Stratigraphy, Jilin University, China. Type locality： Nanyang Coal-mine, Helong County, Jilin Province. Type horizon： Changcai Formation, Lower Cretaceous （Aptian）. Etymology： Changcai refers to the stratigraphic horizon, the Lower Cretaceous C.hangca