FIGURE 3 in Passiflora coelestis, a new species of Passiflora section Dysosmia (Passifloraceae sensu stricto) from Southern Brazil

FIGURE 3. Anatomy of the androecium of Passiflora coelestis. Filament with regular epidermis and mesophyll with rounded parenchymatic cells and vascular bundle in a horseshoe shape (a). Tetrasporangiate anther in pre-anthesis (b) with the connective region with lignified thickenings on the wall on the cell layer next to the endothecium (c), presence of idioblasts with druses (arrow) (d), unistratified endothecium with lignified thickenings (*) on the wall (d and e) and stomial region with anticlinally elongated epidermic cells (f). Tapetum presents during microgametogenesis with distinct conformations, with up to six nuclei per cell (arrow) (g and h). Pollen grain with irregular exine and very thick, sinuous and irregular intine with the endexine interrupted on the colpi region (arrow), with the vegetative nucleus and generative cell (i). Pollen grain with shape prolate-spheroidal, 12-colpi, with evident columellae (j). EP (epidermis), VB (vascular bundle), MS (mesophyll), CN (connective), EN (endothecium), SC (stomial cells), MC (middle layers), T (tapetum), SP (septum), ED (endomytosis), PO (pollen), EX (exine), IN (intine). Scale bars a and b—15μm; c, e and f—10μm; d and g—5μm; h—2μm; i—200μm; j—100μm.