Alisporites sp. cf. A. australis, 1959

Legrand, Julien, Pons, Denise, Nishida, Harufumi & Yamada, Toshihiro, 2011, Barremian palynofloras from the Ashikajima and Kimigahama formations (Choshi Group, Outer Zone of south-west Japan), Geodiversitas 33 (1), pp. 87-135 : 112-114

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).

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?