Cross-section of a leaflet illustrating secretory structures in species of Discolobium and Riedeliella. A, Bulbous base trichome; B, detail of the base with the formation of the cavity (arrowhead) containing mucilage (asterisk) in D. hirtum, in LM; C, bulbous base trichome in D. hirtum, in SEM. D, SEM micrographs of bulbous base trichome (white arrow) and tector trichomes (white arrowhead) in the margin of D. hirtum. E, Ferric chloride test result identifying phenolic compounds idioblasts in R. graciliflora. F, Unspecified mucilaginous idioblasts (arrowhead) in D. pulchellum. G, Elongated mucilaginous idioblasts in D. pulchellum. H, Special mucilaginous idioblasts with the cytoplasm distinct (asterisk) from mucilage (arrowhead) in R. graciliflora. I, Mesophyll with intercellular spaces (asterisk) filled with mucilage extravasated from the idioblasts in D. pulchellum. Scale bars: 10 µm (F, H), 20 µm (B, E), 50 µm (C, D) and 100 µm (A, G, I).

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... trichomes and idioblasts were observed in Discolobium and only idioblasts in Riedeliella (Table 3). The secretory idioblasts varied regarding the shape and nature of the exudate produced (Table 4). Secretory trichomes with a bulbous base (Fig. 3A-D) were detected only in D. hirtum, with two regions: a basal one consisting of a complex of cells with dense cytoplasm without established organization and with a variable number of cells, and an apical one corresponding to more elongated cells. Trichomes with a bulbous base (Fig. 3A) had a cavity delimited by non-turgid cells in the ...

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... produced (Table 4). Secretory trichomes with a bulbous base (Fig. 3A-D) were detected only in D. hirtum, with two regions: a basal one consisting of a complex of cells with dense cytoplasm without established organization and with a variable number of cells, and an apical one corresponding to more elongated cells. Trichomes with a bulbous base (Fig. 3A) had a cavity delimited by non-turgid cells in the basal portion and mucilage was detected in the intracellular region (Fig. 3A, ...

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... basal one consisting of a complex of cells with dense cytoplasm without established organization and with a variable number of cells, and an apical one corresponding to more elongated cells. Trichomes with a bulbous base (Fig. 3A) had a cavity delimited by non-turgid cells in the basal portion and mucilage was detected in the intracellular region (Fig. 3A, ...

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... containing phenolic compounds were observed in all species of Riedeliella, and in D. hirtum and D. leptophyllum. Idioblasts occurred below both epidermal surfaces and in parenchymatic cells of the mesophyll in Riedeliella (Fig. 3E), between the sheath cells of the vascular bundles of the intercostal region in D. hirtum, below the epidermis of the abaxial face of the intercostal region and below the epidermis of (Fig. 3E, Table 4). Mucilaginous idioblasts in the epidermis were classified into three types according to their shape and to the pattern of mucilage ...

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... and in D. hirtum and D. leptophyllum. Idioblasts occurred below both epidermal surfaces and in parenchymatic cells of the mesophyll in Riedeliella (Fig. 3E), between the sheath cells of the vascular bundles of the intercostal region in D. hirtum, below the epidermis of the abaxial face of the intercostal region and below the epidermis of (Fig. 3E, Table 4). Mucilaginous idioblasts in the epidermis were classified into three types according to their shape and to the pattern of mucilage deposition. Unspecified mucilaginous idioblasts (Fig. 3F) were characterized by an intracellular region occupied by mucilage and slightly larger than that of the other epidermal cells. These ...

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... vascular bundles of the intercostal region in D. hirtum, below the epidermis of the abaxial face of the intercostal region and below the epidermis of (Fig. 3E, Table 4). Mucilaginous idioblasts in the epidermis were classified into three types according to their shape and to the pattern of mucilage deposition. Unspecified mucilaginous idioblasts (Fig. 3F) were characterized by an intracellular region occupied by mucilage and slightly larger than that of the other epidermal cells. These idioblasts occurred in all species analysed, on both sides of the epidermis in the intercostal region and margin of Riedeliella spp. and on the abaxial side of the epidermis in the intercostal region of ...

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... occupied by mucilage and slightly larger than that of the other epidermal cells. These idioblasts occurred in all species analysed, on both sides of the epidermis in the intercostal region and margin of Riedeliella spp. and on the abaxial side of the epidermis in the intercostal region of Discolobium spp. In elongated mucilaginous idioblasts (Fig. 3G), the entire intracellular region was occupied by mucilage with the cell projecting towards the central region of the mesophyll. These idioblasts were observed only on the adaxial side of all Discolobium spp., except for D. hirtum that had mucilaginous idioblasts on both sides of the epidermis. Special mucilaginous idioblasts (Fig. 3H) ...

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... idioblasts (Fig. 3G), the entire intracellular region was occupied by mucilage with the cell projecting towards the central region of the mesophyll. These idioblasts were observed only on the adaxial side of all Discolobium spp., except for D. hirtum that had mucilaginous idioblasts on both sides of the epidermis. Special mucilaginous idioblasts (Fig. 3H) showed the deposition of mucilage on one side of the wall, with the remaining cytoplasmic contents being present at the other end of the cell. These types were seen on both sides of the epidermis only in R. graciliflora. Mucilage can extravasate into the intercellular space of the mesophyll (Fig. 3I), as observed in D. pulchellum. The ...

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... the epidermis. Special mucilaginous idioblasts (Fig. 3H) showed the deposition of mucilage on one side of the wall, with the remaining cytoplasmic contents being present at the other end of the cell. These types were seen on both sides of the epidermis only in R. graciliflora. Mucilage can extravasate into the intercellular space of the mesophyll (Fig. 3I), as observed in D. pulchellum. The presence of mucilage and pectins was detected in all mucilaginous idioblasts (Table ...