Fossil matoniaceous plants represented by Phlebopteris have been formerly descrinbea and illustrated from the Mesozoic of China mainly based on vegetative leaves, and no information is provided on the fine structure o...Fossil matoniaceous plants represented by Phlebopteris have been formerly descrinbea and illustrated from the Mesozoic of China mainly based on vegetative leaves, and no information is provided on the fine structure of fertile organs. Recent reinvestigation of the Hsiangchi Flora from the Lower Jurassic of West Hubei, China, obtained a rich collection of well preserved Phlebopteris specimens (both sterile and fertile). Studies on Phlebopteris polypodioides Brongniart using LM and SEM reveal not only the structures of sori and sporangia, but also the details of in situ spores. Comparisons have been made between the in situ spores and other related fossil and extant matoniaceous spores, as well as the dispersed genera.展开更多
In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new speci...In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new species of Coniopteris moguqiensis sp. nov. preserved as a fragment with fertile and sterile pinnules. The sterile ultimate pinnules are elongate ovate with sphenopteriod type venation, and fertile pinnules are usually isolated, bipinnate at least with the sorus apical, elliptical, 1 mm in diameter;sporangia are almost globular, 100-150 μm in diameter, and the annulus is vertical. In situ spores are rounded-triangular in polar view, 25-30 μm in diameter with sides straight and slightly convex;trilete, laesurae are thin and slightly straight;the exine surface is usually psilate under the light microscope but finely reticuloid sculptured on the proximal view under a scanning electronic microscope. The fern genus Coniopteris usually suggests a warm and humid environment, which is consistent with the palaeoclimatic conditions of petrified wood and megafossil plants. The new discovery further supplements the floral composition of the Wanbao Formation, providing new material for understanding the evolutionary trend and classification of Coniopteris.展开更多
A petrified strobilus Discinites sinensis sp. nov. is discovered from the Lower Permian of Shizuishan in Ningxia, North China. The epidermal cells of sporophyll are long and narrow, with both ends pointed. Each sporan...A petrified strobilus Discinites sinensis sp. nov. is discovered from the Lower Permian of Shizuishan in Ningxia, North China. The epidermal cells of sporophyll are long and narrow, with both ends pointed. Each sporangium is ellipsoid, with the basal part contracted and short, thick sporangiophore-like. The cells of tapetum and sporangial walls are arranged longitudinally. The annulus is not developed. Mega- and microsporangia are similar in shape. They can hardly be distinguished unless they are broken, and the spores are exposed. in situ mega- and microspores are also similar in shape and both of the Deltoidospora type. The new species supports the systematic placement of Discinites within Noeggerathiales, and the progymnosperm affinity of the Noeggerathiales.展开更多
文摘Fossil matoniaceous plants represented by Phlebopteris have been formerly descrinbea and illustrated from the Mesozoic of China mainly based on vegetative leaves, and no information is provided on the fine structure of fertile organs. Recent reinvestigation of the Hsiangchi Flora from the Lower Jurassic of West Hubei, China, obtained a rich collection of well preserved Phlebopteris specimens (both sterile and fertile). Studies on Phlebopteris polypodioides Brongniart using LM and SEM reveal not only the structures of sori and sporangia, but also the details of in situ spores. Comparisons have been made between the in situ spores and other related fossil and extant matoniaceous spores, as well as the dispersed genera.
基金financially supported by the Project of the NSFC, China (grant No.41602015, 41702032)the Geological Survey Programs of the China Geological Survey (grant No. DD20160048-4, No. DD20190039-06, 2017YFC060130501)+2 种基金the State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) (grant No.183117)the Project “Establishment of Stratotypes of China—Improvements on Stratigraphic Chart of China” (grant No.2015FY310100)the Project “Divisions and Correlation of National Non-Marine Strata (K-Pg boundary) in China (grant No. 121201102000150010-04)
文摘In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new species of Coniopteris moguqiensis sp. nov. preserved as a fragment with fertile and sterile pinnules. The sterile ultimate pinnules are elongate ovate with sphenopteriod type venation, and fertile pinnules are usually isolated, bipinnate at least with the sorus apical, elliptical, 1 mm in diameter;sporangia are almost globular, 100-150 μm in diameter, and the annulus is vertical. In situ spores are rounded-triangular in polar view, 25-30 μm in diameter with sides straight and slightly convex;trilete, laesurae are thin and slightly straight;the exine surface is usually psilate under the light microscope but finely reticuloid sculptured on the proximal view under a scanning electronic microscope. The fern genus Coniopteris usually suggests a warm and humid environment, which is consistent with the palaeoclimatic conditions of petrified wood and megafossil plants. The new discovery further supplements the floral composition of the Wanbao Formation, providing new material for understanding the evolutionary trend and classification of Coniopteris.
文摘A petrified strobilus Discinites sinensis sp. nov. is discovered from the Lower Permian of Shizuishan in Ningxia, North China. The epidermal cells of sporophyll are long and narrow, with both ends pointed. Each sporangium is ellipsoid, with the basal part contracted and short, thick sporangiophore-like. The cells of tapetum and sporangial walls are arranged longitudinally. The annulus is not developed. Mega- and microsporangia are similar in shape. They can hardly be distinguished unless they are broken, and the spores are exposed. in situ mega- and microspores are also similar in shape and both of the Deltoidospora type. The new species supports the systematic placement of Discinites within Noeggerathiales, and the progymnosperm affinity of the Noeggerathiales.
