云南临沧晚中新世一种水龙骨科植物化石的修订及其生物学意义

Revision on a fossil species of Late Miocene polypodiaceae from Lincang,Yunnan Province,and its biological significance

云南现代真蕨类植物资源丰富,蕨类植物多样性的地史起源,必须从化石记录入手。在云南临沧上中新统邦卖组植物化石采集中发现了槲蕨属1块不育叶和2块腐殖叶的新材料,这些标本为修订Drynaria propinqua Wen et al.,2013,以及揭示该种不育叶和腐殖叶的特征提供了新的材料。通过与槲蕨属国内外报道的化石种和现生种的详细比较,将其重新定名为Drynaria cf.propinqua。Drynaria cf.propinqua的发现,表明云南临沧晚中新世的气候与现今中国西南地区温暖湿润的气候类似,这些附生植物的生活习性表明,临沧地区复杂分层的森林生态系统至少在晚中新世已经确立。

Yunnan Province is rich in resources of modern ferns.Understanding the origin and the diversity history of Yunnan ferns must learn from fossil records.Some new materials including one sterile frond and two humus fronds of the genus Drynaria were found in recent collections.These new specimens allow us to revise the previous fossil species Drynaria propinqua Wen et al.,2013,and provide supplementary characteristics of sterile and humus fronds for this species.On the basis of detailed morphological comparison of fossils with extant species of Drynaria,the authors identified this species as Drynaria cf.propinqua.The occurrence of Drynaria cf.propinqua indicates that the Late Miocene climate of Lincang in Yunnan was similar to that of Southwest China today,being warm and humid.The epiphytic habit of its extant relative species implies that the complex hierarchical forest ecosystem of Lincang in Yunnan had been established at least in Late Miocene.