Acianthera leaf blades.
Schematic drawing of cross-sections (A-C), cross-sections under light microscopy (D and E), frontal view under SEM (F-H), and light microscopy (I-O). (A) A. atropurpurea, line drawing highlighting organization of vascular bundles in mesophyll. (B) A. crepiniana, line drawing of elliptical leaf highlighting organization of vascular bundles in mesophyll. (C) Acianthera teres, round-sulcate leaf showing adaxially facing phloem. (D) Acianthera mantiquyrana, circular leaf, showing wider vascular bundles (vb) towards the medial region and outside-facing phloem. (E) Acianthera crepiniana, elliptical leaf with two parallel vascular bundles (vb) of larger diameter in basal area. (F) Acianthera saurocephala, smooth epidermis. (G) Acianthera luteola, verrucous epidermis. (H) Acianthera crepiniana, papillose epidermis. (I) Acianthera atropurpurea, epidermis with trichome insertion scars (arrow). (J) Acianthera teres, epidermis showing stomatal complex with six subsidiary cells. (K) Acianthera saundersiana, polygonal cells in epidermis (ep) and single-layered adaxial hypodermis (arrow). (L) Acianthera teres, dome-shaped epidermal cells (ep), and cuticle with Sudan III reaction. (M) Acianthera crepiniana, papillose epidermis (ep). (N) Acianthera prolifera, round tracheoidal idioblast in mesophyll. (O) Pleurothallopsis nemorosa, heterogeneous mesophyll with aquiferous parenchyma (ap), palisade parenchyma (pp) and spongy parenchyma (sp).
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