The Early Miocene vegetation of western Styria, Austria, is reconstructed on the basis of detailed investigations of leaves and diaspores from the mining area Oberdorf N Voitsberg. In this paper, the flora and probable vegetation are compared with other assemblages of similar age from the Czech Republic and Germany to elucidate the diversity of wetland and mesophytic plant communities. The floristic composition and the vegetational units represented in Oberdorf are compared to the middle part of the Most Formation (M Most Fm), Cypris Shale, Mydlovary Formation (Mydlovary Fm) of Bohemia, and the Wackersdorf mining area of Bavaria. Among these sites, Oberdorf is extremely poor in hydrophytes and reed-like monocotyledons, indicating rare pond-like habitats as well as possibly more closed swamp forest conditions than, e.g. in the M Most Fm. In Oberdorf, relatively high pH-values in the lignite-forming swamps and the possible scarcity of acidic, nutrient-poor (sandy) soils have probably influenced the floristic composition of the azonal communities. The peat-forming associations in all regions share the abundance of Glyptostrobus europaeus. However, distinct differences in the accompanying elements, such as Taxodium dubium (present and abundant only in the M Most Fm) indicate even stronger floristic variability of Early(/Middle) Miocene peat-forming and riparian plant communities than previously expected. The virtual absence of Pinus, Engelhardia, Comptonia, and probably also of Quercus kubinyii/Quercus drymeja in the megafossil record of Oberdorf can possibly be explained by the edaphic conditions. The abundance of Sequoia abietina (absent in all the other compared sites), which we assign to riparian (and mesophytic) forests in Oberdorf, may have been favoured by rich alluvial soils.In the mesophytic associations, thermophilous elements of the Lauraceae, Mastixiaceae, Symplocaceae, and Rutaceae are diverse. Usually they include Trigonobalanopsis rhamnoides/Trigonobalanopsis exacantha, an evergreen Fagaceae. This assemblage type corresponds with the Younger Mastixioid Flora sensu Mai. The Younger Mastixioid Flora is best developed in Wackersdorf, less distinct in Oberdorf, and likely in the Cypris Shale and Mydlovary Fm. It is not traceable in the M Most Fm.

中文翻译：

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比较 Oberdorf N Voitsberg（奥地利）、波希米亚（捷克共和国）和 Wackersdorf（德国）的早中新世植物群和可能的植被类型

奥地利施蒂利亚州西部的早中新世植被是在对 Oberdorf N Voitsberg 矿区的树叶和水散物进行详细调查的基础上重建的。在本文中，植物群和可能的植被与来自捷克共和国和德国的其他类似年龄的组合进行了比较，以阐明湿地和中生植物群落的多样性。将 Oberdorf 中代表的植物区系组成和植被单元与波西米亚的 Most Formation (M Most Fm)、Cypris Shale、Mydlovary Formation (Mydlovary Fm) 和巴伐利亚的 Wackersdorf 矿区的中部进行比较。在这些地点中，奥伯多夫的水生植物和类似芦苇的单子叶植物极其贫乏，这表明与 M Most Fm 相比，这里有罕见的池塘状栖息地以及可能更封闭的沼泽森林条件。在奥伯多夫，褐煤形成沼泽中相对较高的 pH 值以及酸性、营养贫乏（沙质）土壤的可能稀缺性可能影响了非地带性群落的植物区系组成。所有地区的泥炭形成协会都拥有丰富的 Glyptostrobus europaeus。然而，伴生元素的明显差异，如紫杉（仅在 M Most Fm 中存在和丰富）表明早（/中）中新世泥炭形成和河岸植物群落的植物群落比先前预期的更强。在 Oberdorf 的巨型化石记录中，实际上没有 Pinus、Engelhardia、Comptonia，也可能没有 Quercus kubinyii/Quercus drymeja，这可能可以通过土壤条件来解释。红杉 abietina 的丰度（在所有其他比较站点中都没有），我们将其分配给 Oberdorf 的河岸（和中生）森林，可能受到肥沃的冲积土壤的青睐。在中生组合中，樟科、乳香科、Symplocaceae 和芸香科的嗜热元素是多种多样的。通常它们包括 Trigonobalanopsis rhamnoides/Trigonobalanopsis exacantha，一种常绿的壳斗科植物。这种组合类型对应于 Younger Mastixioid Flora sensu Mai。Younger Mastixioid Flora 在 Wackersdorf 发育得最好，在 Oberdorf 不太明显，可能在 Cypris Shale 和 Mydlovary Fm。在 M Most Fm 中无法追踪。通常它们包括 Trigonobalanopsis rhamnoides/Trigonobalanopsis exacantha，一种常绿的壳斗科植物。这种组合类型对应于 Younger Mastixioid Flora sensu Mai。Younger Mastixioid Flora 在 Wackersdorf 发育得最好，在 Oberdorf 不太明显，可能在 Cypris Shale 和 Mydlovary Fm。在 M Most Fm 中无法追踪。通常它们包括 Trigonobalanopsis rhamnoides/Trigonobalanopsis exacantha，一种常绿的壳斗科植物。这种组合类型对应于 Younger Mastixioid Flora sensu Mai。Younger Mastixioid Flora 在 Wackersdorf 发育得最好，在 Oberdorf 不太明显，可能在 Cypris Shale 和 Mydlovary Fm。在 M Most Fm 中无法追踪。