نتایج جستجو برای: cycad

تعداد نتایج: 248  

Journal: :American Journal of Botany 2021

PREMISE Fossils can reveal long-vanished characters that inform inferences about the timing and patterns of diversification living fungi. Through analyzing well-preserved fossil scutella, shield-like covers fungal sporocarps, we describe a new taxon early Dothideomycetes with combination unknown among extant taxa. METHODS Macerated clays from Potomac Group, lower Zone 1, Lower Cretaceous (Aptia...

Journal: :Flora 2021

Cycadales and Ginkgoales constitute two of the most ancient lineages extant seed plants as such are prime candidates for study evolution seeds genes involved. The ovules these plant formed by a single massive integument that, ovule matures into seed, is comprised stony layer covered fleshy coat. However, literature on their morphology anatomy, which key understanding land plants, scarce not eas...

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