作 者 ：王洪山 盛阿兴 杨关秀
期 刊 ：植物学通报 2000年 17卷 专辑期 页码：179-183
摘 要 ：本文报道了星囊蕨属(Asterotheca)的三个种，即：A．sahnii Hsu，A．oriertalis(Schenk)Pot．和A．arborescens(Stem．)Stur。标本均采自河南省平顶山煤田中二叠世小风口组黑色泥岩中，为保存有原位生殖器官的压型标本。作者对其原位聚合囊、孢子囊及孢子进行了较详细的描述。Asterotheca sahaii和A．arborescens的聚合囊仅限于小羽片的中下部，而A．arborescens的聚合囊都由4个孢子囊组成，孢子囊为两侧边不对称的窄卵形，孢子单缝，表面光滑；两者的区别在于A．sahnii的聚合囊仅限于小羽片的中下部，而A．arborescens的聚合囊布满整个小羽片，A．sahnii小羽片的长宽比大于A．arborescens；A．orientalis的聚合囊由6个孢子囊组成，孢子囊亦为不对称的窄卵形，孢子单缝，外壁具细瘤状纹饰。本文将星囊蕨属(Asterotheca)与虫囊蕨属(Scolecopteris)进行了比较，认为从蕨叶形态和生殖器官的特征看来，两者有较明显的区别，Asterotheca和Scolecopteris很可能都是古生代莲座蕨目中客观存在的自然属。
Abstract:Three species of Asterotheca, i.e. Asterotheca sahnii Hsu, Asterotheca orientalis (Shenk) Pot. and Asterotheca arborescens (Stem) Stur are reported in this paper. The compression specimens with well-preserved reproductive organs were collected from black mudstone of Xiaofengkou Formation of Middle Permian in Pingdingshan Coalfield of Henan province, Central China. In situ synangia, sporangia and spores of the three species were described in detail. Synangia of Asterotheca sahnii and Asterotheca arborescens consist of 4 sporangia, which are laterally asymmetric narrow ovate. Spores are monolete with smooth exine. A. sahnii is distinguished from A. arborescens by (1) its synangia are distributed only on the proximal to middle portion of the pinule while those of the latter occupy the entire pinnule and (2) the length/width ratio of its pinnule is larger than that of A. arborescens; Synangium of Asterotheca orientalis consists of 6 sporangia, which are also narrow ovate and asyrmmetric. Spores are monolete with verruculose exine. Based on Chinese specimens, differences between Asterotheca and Scolecopteris are: (1) pinnules of Scolecopteris show morphological variations, with most of the fertile pinnules narrower, or wider and shorter than vegetative ones and abaxially curved, while fertile and vegetative pinnules of Asterotheca are synmorphic and are smaller than those of Scolecopteris; (2) synangium of Scolecopteris from China consists of 4 elongate columnar and larger sporangia with a short receptacle. For example, Scolecopteris cathaysicus, which is from the same horizon as Asterotheca from the Pingdingshan Coalfield of Henan Province, has elongate columnare sporangium up to 1.8-2.2 mm long. Sporangia of the three species of Asterotheca are smaller, asymmetric and narrow ovate, generally less than 1 mm long and sessile, no fusion between adjacent sporangia and are easily to be separated after processed in Schulze solution; (3) generally, there are 10-12 synangia (up to 16, at least 7) synangia on each side of the midvein on one pinnule of the three Chinese species of Scolecopteris, while the number of synangia on one pinnule of three species of Asterotheca described in this paper rarely exceeds 6. Based on features of frond morphology and reproductive organs observed from the Chinese specimens, Asterotheca and Scolecopteris are easily to be distinguished and probably both are natural genera of the Paleozic Marattiales.
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