Plicatella sp.

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 : 106

Plicatella sp. ( Fig. 9N, Q )

OCCURRENCE. — Ashikajima Fm.

DESCRIPTION

Trilete microspore. Amb triangular with straight to slightly convex sides and raised tops. The laesurae are thin, straight, raised, and extend to the 3/4 of the spore radius. Exine canaliculate. The proximal face shows a small psilate contact area, followed by 3 sets of 3-4 muri (1.5 to 4 µm wide) parallel to the equator; the muri join at the tops. The distal face is ornamented by 3 sets of 4 wavy muri parallel to the equator, distributed in a slight interval to form concentric triangles centered on the distal pole ( Fig. 11 ). The ornamentation of this form corresponds to the type I-B defined by Krutzsch (1963). Equatorial diameter = 40-50 µm.

BOTANICAL AFFINITIES

Schizaeales , Schizaeaceae ( Dettmann & Clifford 1992) .

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.