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隶属于里白科(Gleicheniaceae)的稀囊蕨(Oligocarpia)和晋囊蕨(Chansitheca)在华北二叠系中已早有记述.姚兆奇等人在江苏镇江伏牛山煤田发现了具里白科特征的生殖叶,与已知的Oligocarpia和Chansitheca不同,经过对生殖器官的详细研究,确认应归入里白科,定名为天石蕨(Szea).姚等人还认为华南、江苏、福建、贵州、云南等地原归入Cladophlebis各种的一些化石都应归入天石蕨属,华北Cladophlebis permica Lee et Wang的标本及产于河南禹州的Cladophlebis henanensis Zhang et Mo,则改归入李氏蕨属(Lixotheca)近年来,笔者
Oligocarpia and Chansitheca, belonging to the Gleicheniaceae, have long been described in the North China Permian. Yao Zhaoqi et al. Discovered a member of the Triassic family in the Funiu Mountain in Zhenjiang, Jiangsu Province Reproductive leaves, different from the known Oligocarpia and Chansitheca, have been identified as Rhizoctonia so as to be identified as Szea after detailed studies of reproductive organs. Yao et al. Also believe that southern China, Jiangsu, Fujian, Guizhou, Some of the fossils originally classified as Cladophlebis in Yunnan, etc., should be classified into the genus Cladophlebis permica Lee et Wang and Cladophlebis henanensis Zhang et Mo in Yuzhou, Henan Province, (Lixotheca) In recent years, the author