FIGURE 3 in Isoetes shangrilaensis, a new species of Isoetes from Hengduan mountain region of Shangri-la, Yunnan

FIGURE 3. Spore morphology from an individual of population ZD1 of Isoetes shangrilaensis. A–D: Megaspore. A, polar view of proximal surface showing laevigate with some scurfy scales. B, equaturial view of proximal showing equatorial and radial ridges higher, wider than with I. hypsophila. C, distal surface showing surface low, sparsely tuberculate to rugulate. D, detail of the distal surface showing boldly, low-rugulate with dense coverage of small fibrils. E–F: Microspores. E, proximal surface showing coarsely low echinate to cristate surface with occasional filamentous structures. F, distal surface. Scale bars: A, C, 200μm; B, 100μm; D, 50μm; E, F, 10μm