Barremian palynofloras from the Ashikajima and Kimigahama formations (Choshi Group, Outer Zone of south-west Japan) Author Legrand, Julien Author Pons, Denise Author Nishida, Harufumi Author Yamada, Toshihiro text Geodiversitas 2011 2011-03-31 33 1 87 135 http://dx.doi.org/10.5252/g2011n1a6 journal article 7707 10.5252/g2011n1a6 31ed99a5-9135-40a2-92a4-64217d9de577 1638-9395 4597011 Microreticulatisporites sp. 1 ( Fig. 8M, P ) OCCURRENCE. — Kimigahama Fm (one specimen). DESCRIPTION Microspore. Amb circular. The laesurae are not seen. Exine microreticulated and finely scabrate. The mesh is polygonal, of various shapes and sizes (lumina 0.2 to 1.5 µm in diameter). The exine is 2 µm thick. Equatorial diameter = 40-45 µm . BOTANICAL AFFINITIES The ornamentation of this species shows similarities with that of some Polypodiales (Dennstaedtiaceae) figured by Tryon & Lugardon (1991) . Moreover, the genus may have sphenophyte affinities, e.g. with the Noeggerathiales ( Knox 1950 ; Singh 1964 ).