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Fig. 4. Consecutive transverse sections through the basal apparatus showing the two bbs (A; the upper bb is sectioned transversely, the lower bb at an oblique angle) and probasal bodies (C-F, open arrows; the left pbb is sectioned longitudinally, the right pbb transversely). Within the lumen of the bb, electron-dense patches are associated with the A- and B-tubules of the microtubular triplets (A, small arrowheads; see also Fig. 1K). These patches are interconnected by a fine filament (A, small arrow). The distal connecting fiber (A,B, dcf) is attached to triplets 9, 1 and 2 of each bb, starting at the level where the transitional fibers (A, large arrows) terminate. The nucleus-bb connector is attached to triplets 7 and 8 (B-D, curved arrows). The cruciate microtubular root system is labeled in C [d for the dexter (right) roots, s for the sinister (left) roots]. The s-roots are connected to the bbs by two sets of fibers: the more distal sf¹ is attached to the C-tubule of triplet 4 (C, sf¹) and makes contact with the upper surface of the corresponding s-root; the more proximal sf² (D-F, sf²) makes contact with the lower surface of the corresponding s-root. The main attachment site of the sf² with the bb is triplet 3, but projections are also in contact with triplets 2 and 4 (see also Fig. 3F). Material of the sf² is underlying at least triplets 2 and 3 below the proximal end of the bbs (F, sf²). The d-roots are linked to the bbs by the d-fibers; the df is attached to triplets 8 and 9 (C, triplets numbered). At their proximal ends, the bbs are interconnected by two proximal connecting fibers and a median proximal connecting fiber. The main attachment site of the proximal connecting fiber (D,E, arrows) is triplet 8, but it also makes contact with triplets 7 and 9 (see also Fig. 3F). Attachment sides of the median proximal connecting fiber are, more distal at the bb, triplets 5 and 6 (D,E, arrowheads); more proximal at the bb, the mpcf is also attached to triplets 4, 7 and 8. Parts of the median proximal connecting fiber underlying the proximal ends of the bbs are visible in F (arrowheads, see also Fig. 3A-D). For the proximal connecting fibers and median proximal connecting fibers, see also Fig. 6I,J. Scale bar, 250 nm.

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