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123 Chayan Picheansoonthon and Pornpimol Wongsuwan «“√ “√ √“™∫— ≥±‘ µ¬ ∂“π ªï ∑’Ë ÛÛ ©∫— ∫∑’Ë Û °.§.-°.¬. ÚııÒ Figures. 10 H. forrestii , 11 H. gardnerianum , 12 H. gomezianum , 13 H. khaomaenense , 14 & 15 H. longicornutum , 16 & 17 H. samuiense , and 18 H. speciosum [photographed by Chayan Picheansoonthon (Figs. 10-11, 13 and 18) and Pornpimon Wongsuwan (Figs. 12 and 14-17)] 10 11 12 13 14 15 16 17 18