Figure 5

Scanning electron micrographs of trichomes in leaves of Digitalis purpurea L. as affected by (a) Red, (b) Blue, (c) Fluorescent light, and combined LEDs of red and blue light, (d) RB (1:1), (e) R:B (8:2), and (f) R:B (2:8) respectively, (g,h) and (j,k) multicellular glandular trichomes under a light microscope (Leica CME) at 20x magnification (bar = 75 μm), (i) single spherical secreting cell (trichome head) (bar = 4 μm), (l) unicellular stalk with single spherical secreting cell at the apex (bar = 30 μm).