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. 2023 Apr 3;8(2):145. doi: 10.3390/biomimetics8020145

Figure 8.

Figure 8

Examples of different types of leaf hairs (trichomes). (a) Capitate (“head bearing”) glandular trichome of the sunflower. (b) Nonglandular trichome of sunflower, featuring warty protuberances on its surface. (c) Cross-section through a leaf of Banksia ornata, featuring stomatal crypts indicated by red arrows (the magnification is not large enough to recognize the stomata). The stomatal crypts are filled with long curly hairs sticking out of the crypt opening, thereby also covering the lower epidermis. UE: upper epidermis. LE: lower epidermis. (d) Linear glandular trichome of the sunflower. (e) A water droplet on the lower epidermis of B. ornata. The trichomes are not water-repellent and partially cover the droplet (indicated by red arrow). (f) Stellate (star-like) trichomes on the lower leaf side of Viburnum rhytidophyllum (leatherleaf Viburnum). (g) Absorptive scales of Tillandsia crocata. Red arrow: central shield. Blue arrow: elongated wing cells. (h) Top view on the lower leaf surface of B. ornata. The red arrows indicate stomatal crypts that—due to their trichome filling—appear as “nests” of hair.