The fossil liverwort Naiadita lanceolata is described here from lacustrine deposits occurring intercalated in the Albertibank complex of the Lower Keuper, Erfurt Formation (Ladinian, Middle Triassic) of Schleerieth, northern Bavaria, Germany. The specimens represent the stratigraphically oldest records of this taxon so far. Leafy gametophytic plants are preserved as impression-compression fossils and include four specimens also showing the terminal or subterminal sporophyte in situ, as well as four leafy stems bearing conical gemma cups with lobed margins. Based on the new material, a refined reconstruction of N. lanceolata is proposed. The new found specimens also shed light on some plant taphonomic processes. The monospecific N. lanceolata assemblages comprise mostly leafy gametophytic stems, often still showing the three-dimensional orientation of the foliage. Another peculiar characteristic is the mass accumulation of isolated sporophyte capsules, which are partially surrounded by perianth leaves, probably a useful propagule mechanism for the cleistocarpous capsules.

中文翻译：

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来自德国中三叠纪（拉丁语）的Naiadita lanceolata（Marchantiophyta）：一项新的重建尝试和对正态性的考虑

此处描述的化石地草乃乌是Naiadita lanceolata，是由插在德国北部巴伐利亚州Schleerieth的Erfurt组下Keuper的Albertibank复合体（拉三尼，中三叠世）中的湖相沉积层中描述的。这些标本代表了该分类单元迄今为止在地层上最古老的记录。叶状配子体植物被保存为压纹化石，其中包括四个标本，这些标本也显示原位孢子体的末端或亚末端，以及四个带有圆锥形宝石杯，边缘具裂片的叶状茎。在此新材料的基础上，提出了一种对轮叶猪笼草的精细重建方法。新发现的标本还阐明了某些植物的Thonomic过程。单特异性N.lanceolata组合主要包括多叶配子体茎，通常仍显示叶子的三维方向。另一个奇特的特征是分离的孢子囊的质量积累，这些孢子囊被花被叶部分包围，这可能是一种有用的繁殖方式，用于树果皮胶囊。