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Fig. 5. Consecutive series showing the d- and s-roots, SMAFs and pbb. (A,B) The distal connecting fiber (dcf), both d-roots (d; their proximal ends are visible) and the corresponding SMAFs (double arrowheads) are marked. Notice that, at their proximal ends, the d-root microtubules are detached from their corresponding SMAFs. (C-F) The s-root in transverse sections. The SMAF (C-F, large arrowheads) overlying the s-root is very small and only associated with root microtubule 4. Near the proximal end of the s-root, microtubules 2 and 3 are attached by some electron-dense material to the bb (C). The sf¹ (D, sf¹) is attached to the upper surface of the s-root to root microtubules 2 and 3. The sf² (D,E, sf²) makes contact with the lower surface of the s-root to root microtubules 1, 2 and 3. Material of the sf² is underlying the bb (B,C, sf²). Filaments of the lateral striated fiber interconnecting the pbb (D-F, open arrows) to the sf², the s-root microtubules and probably the bb proper are labeled (D-F, small arrowheads). Scale bar, 250 nm.

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