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1(c). Canna, t.s. of typical monocot stem with scattered bundles2(f). Aristolochia, t.s. of one year, two years stem and older stem, all 3 in on slide 3(e). Dicot and monocot stem, t.s. of Helianthus and Canna 4(e). Dicot and monocot stem, t.s. of Ranunculus and Zea 5(e). Tilia, lime, two t.s. of stems, first year and two years 6(d). Fagus silvatica, beech, three sections of wood, t.s., r.l.s., t.l.s. 7(d). Fraxinus excelsior, ash, three sections of wood, t.s., r.l.s., t.l.s. 8(c). Quercus, oak, t.s. of stem showing cambium and bark 9(c). Sambucus, elder, t.s. of bark showing lenticells 10(c). Linum, flax, t.s. of stem showing husk fibres 11(b). Linum, flax, isolated husk fibres, w.m. 12(d). Ranunculus, l.s. of herbaceous stem 13(d). Cucurbita pepo, l.s. of stem with sieve tubes 14(d). Sieve plates in top view, t.s. of Cucurbita stem 15(c). Lamium, t.s. of square stem, collenchyma 16(c). Secale, rye, t.s. of typical grass stem 17(c). Nymphaea, water lily, t.s. of aquatic stem, spicular cells 18(c). Hippuris, t.s. of typical aquatic stem with large central pith 19(d). Urtica, nettle, stinging hairs with poison ducts 20(c). Solanum tuberosum, potato, t.s. of tuber with starch grains and cork
