Figure 1

Light microscopy (LM) and scanning electron microscopy (SEM) images of trichomes of Rhododendron tomentosum. (a) LM cross-section of a leaf half with glandular trichomes on abaxial (ab) and adaxial (ad) sides. Cross-sections of long, hairy trichomes appear in a space on the abaxial side. (b) SEM sample of fractured leaf showing spherical, glandular trichomes on the abaxial and adaxial leaf sides and long, hairy trichomes. (c) Glandular, long hairy and short hairy trichomes on bud surface. SEM. (d) Glandular and long hairy trichomes on surface of stem and (e) petiole of older leaf. SEM. (f) Abundant long, hairy trichomes on the midrib (md), and glandular trichomes on the adaxial leaf surface. SEM. (g–l) Details of glandular trichomes with stalk and multicelled head in (g–i) LM and (j–l) SEM images. (g and j) developing glandular trichome, (h and k) full sized intact glandular trichome, (i and l) collapsed, deteriorated trichome. Note particle accumulation in (l). Particles of abiotic and biotic origin typically accumulated on and around deteriorated trichomes on the adaxial surface of leaves.