Longitudinal walls have a cuticle almost impermeable to water and sucrose and no ectodesmata. The interconnecting walls have plasmodesmata scattered over the wall; av. diam. 0.045 p.m, appr. 11 per pm2, covering 1.65 % of the wall area. This area, together with the cross-sectional area of the cytoplasmic layer between plasmalemma and tonoplast, gives an impression of capacity for transport through the cytoplasmic part of the symplasm. The two areas were compared.