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 Alisporites sp. cf. A. australis de Jersey , 1962 OCCURRENCE. — Ashikajima Fm. DESCRIPTION Bisaccate pollen grain. Central body spherical, scabrate. The sacci are reticulate and a little longer than the central body, probably hanging. Total width = 50 µm . Central body diameter = 25 µm . Saccates (length × width) = 40 × 10 µm . REMARKS This grain is morphologically very similar to Alisporites australis de Jersey , 1962 previously reported from the Triassic of Australia (de Jersey 1962 ). FIG. 13. — Pollen grains, alga and fungus from the Barremian of south-west Japan: A , Pityosporites sp. cf. P. constrictus Singh, 1964 , lateral view, Ashikajima Fm, II2b-J34/1; B , Alisporites thomasii ( Couper, 1958 ) Pocock, 1962 , polar view, Ashikajima Fm, II2b-O42/3; C , Incertae sedis sp. 2, Ashikajima Fm, II2c-W65/4; D , Balmeiopsis limbatus (Balme, 1957) Archangelsky, 1977, Ashikajima Fm, II2d- N41/2; E , Inaperturopollenites sp., Kimigahama Fm, I1b-U64/4; F -H , Classopollis torosus (Reissinger, 1950) Couper, 1958 emend. Burger, 1965 ( F , distal polar view, Ashikajima Fm, SEM-II2a; G , distal polar view, Ashikajima Fm, II2c-H32/1; H , tetrad, Ashikajima Fm, SEM-II2a); I , Cycadopites minimus (Cookson, 1947) Pocock, 1970 , Ashikajima Fm, II2e-U64; J , Cycadopites sp., Kimigahama Fm, I1a-X30; K , Ephedripites montanaensis Brenner, 1968 , Ashikajima Fm, II2c-N35/4h; L , Gnetaceaepollenites sp., Ashikajima Fm, II2a-S47/1a; M , Corollina sp.,tetrad,Kimigahama Fm, I1a-X42; N , O , Incertae sedis sp. 1, group with detail,Ashikajima Fm,SEM-II2a; P , Pterospermella sp., Ashikajima Fm, II2b-O65; Q , Microthyriacites sp., Ashikajima Fm, II2e-R63/4. Scale bars: 10 μm. BOTANICAL AFFINITIES Gymnosperms, Pteridospermales?