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Droserapollis
''Droserapollis'' is a genus of extinct plants in the family Droseraceae. It is a form taxon known only from fossil pollen.
''Droserapollis'' pollen grains are united in tetrahedral tetrads (groups of four). Individual grains are possibly porate-like. The exine is mixed with gemmate and short baculate processes, whereas the sexine is granulate.〔Huang, T.-C. 1978. ''Botanical Bulletin of Academia Sinica'' 19: 77–81.〕
Poorly preserved〔Degreef, J.D. 1989. ''Carnivorous Plant Newsletter'' 18(3): 86–89.〕 pollen of ''D. gemmatus'' has been found in the Miocene Yutengping Sandstone of Taiwan,〔 whereas that of ''D. khasiensis'' originates from the Paleocene Lakadong Sandstone of Laitryngew, Khasi Hills, Meghalaya, India.〔Kumar, M. 1995. Pollen tetrads from Palaeocene sediments of Meghalaya, India: comments on their morphology, botanical affinity and geological records. ''Palaeobotanist'' 43(1): 68–81.〕〔Saxena, R.K. & G.K. Trivedi 2006. Birbal Sahni Institute of Palaeobotany, Lucknow.〕 In addition, palynomorphs from Germany have also been assigned to the genus.〔
''Droserapollis'' pollen matches that of extant ''Drosera'' in morphology.〔〔Song, Z.-C., W.-M. Wang & F. Huang 2004. Fossil pollen records of extant angiosperms in China. ''The Botanical Review'' 70(4): 425–458. 〕 The tetrads of ''D. gemmatus'' are 53–56 µm in deter. Individual grains are prolate and measure 35–40 by 25–26 µm. The exine is 1.5–2.4 µm thick, with 1–2 µm long gemmae or bacula.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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