Lindsaea kohkongensis I. C. Hwang, M. O. Moon & B. Y. Sun

Lindsaea kohkongensis I. C. Hwang, M. O. Moon & B. Y. Sun, Korean J. Pl. Taxon. 53 (4): 289. 2023. Fig. 2 Type. Cambodia • Koh Kong, Thma Bang District, near Chamnar village, 22 Dec 2013, Sun et al. C 5520 (holotype HIBR; isotypes HIBR, KB). Distribution and ecology. This species was recently described from Cambodia and Malaysia. In Vietnam, it grows along a valley in damp tropical forests as lithophytes and is frequently submerged in water. Specimens examined. Vietnam. • Kien Giang Province: Phu Quoc district, Phu Quoc National Park, 6 Mar 2018, Chen Wade 5034 (TAIF [514046!]). Note. Morphologically, this species closely resembles Lindsaea ensifolia. Although L. kohkongensis is usually a much smaller species than L. ensifolia, we did not identify any qualitative trait to distinguish them. Currently, subaquatic habitat preference appears to be the most reliable characteristic for differentiating this species from L. ensifolia. Yun et al. (2023) described L. kohkongensis as having free venation, in contrast to the anastomosing venation found in L. ensifolia. However, this is not true. As demonstrated in Fig. 3 G of their paper and Fig. 2 F of the current study, the veins of L. kohkongensis are connected near the lamina margin, forming areoles in fertile fronds.