The morphology and anatomy of a new zygopterid fern are described from the Middle Pennsylvanian (Bolsovian) of Flöha, SE Germany. The fossils occur as allochthonous remains within the basal Schweddey Ignimbrite, which preserves a diverse wetland plant community of cordaitaleans, ferns, pteridosperms, calamitaleans, and lycophytes. Pinnae of Alloiopteris loecsei sp. nov. exhibit a combined carbonized and anatomical preservation type due to rapid entombment in fine-grained pyroclastics. The newly collected Alloiopteris fossils show typical gross morphology, but also reveal the anatomy of penultimate and ultimate rachides. The affinity of the new fern is discussed amongst zygopterids in general and the famous zygopterid stems Zygopteris primaria (von Cotta) Corda and Asterochlaena laxa Stenzel from the Flöha site in particular. Our investigation highlights the striking potential of pyroclastic deposits for preserving and yielding both morphological and three-dimensional anatomical aspects of plant fossils.

中文翻译：

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来自Flöha（Flöha盆地，德国SE）的莫斯科（玻利维亚）火山碎屑体的一种新的解剖保存的异翅蕨类植物

从东南部德国Flöha的宾夕法尼亚中部（玻利维亚人）描述了一种新的翅翅类蕨类植物的形态和解剖结构。这些化石是在基底的Schweddey Ignimbrite内以异形残留存在的，该保护区保留了Cordaitaleans，蕨类，蕨类植物，Calamitaleans和lycophytes的多样化湿地植物群落。别翅目羽叶锦鸡儿的品尼。十一月 由于快速包埋在细颗粒的火山碎屑中，因此具有碳化和解剖保存的组合类型。新近收集的同翅异化石化石显示出典型的总体形态，但也揭示了倒数第二个和最终的瑞奇的解剖结构。讨论了新蕨类植物的亲和力，以及常见的famous虫茎（Zygopteris primaria）（von Cotta）特别是来自Flöha的Corda和Asterochlaena laxa Stenzel。我们的研究突出了火山碎屑沉积物在保存和产生植物化石的形态学和三维解剖学方面的惊人潜力。