Cicatricosisporites sp. 2, 1933

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 : 100

Cicatricosisporites sp. 2 ( Fig. 9C, D )

Cicatricosisporites sp. D, Legrand, Palynologie des dépôts Jurassique supérieur et Crétacé inférieur du Japon, et provinces paléofloristiques du sud-est asiatique: 159, 160, pl. VIII, fig. 5 (2009).

OCCURRENCE. — Ashikajima Fm.

DESCRIPTION

Trilete microspore. Amb rounded triangular with convex sides. The spore is bordered by a thin carina. The laesurae are raised, bordered by a small thickening, and extend to the equator of the spore. Exine cicatricose. The proximal face is tetrahedral and psilate. On the distal face, 3 sets of 4 muri (2 to 4 µm wide, separated by spaces 2 to 5 µm wide) parallel to the equator form equilateral triangles centered on the distal pole, where they delimit a wide triangle (side 15 to 20 µm long) ( Fig. 11 ). The exine is about 4 µm thick. The ornamentation of this form corresponds to the type I-A defined by Krutzsch (1963). Equatorial diameter = 45 µm.

BOTANICAL AFFINITIES

Schizaeales , Anemiaceae .

Figures

FIG. 9. — Spores from the Barremian of south-west Japan: A, B, Cicatricosisporites sp. 1, proximal and distal faces, Ashikajima Fm, II2f-U33d; C, D, Cicatricosisporites sp. 2, proximal and distal faces, Ashikajima Fm, II2a-G40d; E, F, Cicatricosisporites sp. 3, proximal and distal faces, Ashikajima Fm, II2h-Q57; G, H, Cicatricosisporites sp. 4, proximal and distal faces, Ashikajima Fm, II2f-Y56/1b; I, J, Cicatricosisporites mohrioides Delcourt & Sprumont, 1955, proximal and distal faces, Kimigahama Fm, I1a-M55; K-M, P, Ruffordiaspora australiensis (Cookson,1953) Dettmann & Clifford,1992 (K, L, proximal and distal faces,Ashikajima Fm,II2c-D62/4;M, P, distal face with detail, Kimigahama Fm, SEM-I1a); O, Matonisporites sp. 2, proximal face, Ashikajima Fm, II2a-J46/4; N, Q, Plicatella sp., proximal and distal faces, Ashikajima Fm, II2h-J54. Scale bars: 10 μm.

FIG. 11. — Ornamentation of the schizaealean forms corresponding to new species or taxa placed in open nomenclature.