Tuberositriletes 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 : 98

Tuberositriletes sp.

( Fig. 6H, L, M )

OCCURRENCE. — Ashikajima Fm (rare).

DESCRIPTION

Trilete microspore. Amb triangular with concave sides. The laesurae extend to the 3/4 of the spore radius. On the proximal face, the contact area is psilate, followed by one row of big welded verrucae (2-4 µm high, 2.5-5 µm in basal diameter) near the equator. The distal face is ornamented by welded and wavy rugulae, which are topped by verrucae. The rugulae are separated by small irregular spaces that can connect. Equatorial diameter = 28 µm.

BOTANICAL AFFINITIES

Filicopsida.

Figures

FIG. 6. — Spores from the Barremian of south-west Japan:A-F, I, J, Manumia japonica n. sp. (A, proximal face, Ashikajima Fm, SEM- II2b; B, distal face,Ashikajima Fm,SEM-II2b;C, F, proximal and distal faces, Ashikajima Fm,II2g-O68;D, E, proximal and distal faces, Ashikajima Fm, II2b-N21/4; I, J, proximal and distal faces, Ashikajima Fm, II2c-K65g); G, Pilosisporites verus Delcourt & Sprumont, 1955, distal face, Ashikajima Fm, SEM-II2c; H, L, M, Tuberositriletes sp. (H, proximal face, Ashikajima Fm, SEM-II2a; L, M, proximal and distal faces,Ashikajima Fm, II2b-U45/4);K, Pilosisporites brevis Delcourt & Sprumont,1955,proximal face,Ashikajima Fm,SEM- II2c; N, Baculatisporites sp., proximal face, Ashikajima Fm, II2b-Z40/3. Scale bar: 10 μm.