First Record of the Mycoheterotrophic Plant Sciaphila corniculata (Triuridaceae) from Ishigaki Island, Ryukyu Islands, Japan, with Updated Description of its Morphology, in particular on Stylar Characteristics

抄録

We report three new localities of the mycoheterotrophic plant Sciaphila corniculata (Triuridaceae) from Ishigaki Island, Ryukyu Islands, Japan. Previously, S. corniculata was reported only from Kolombangara Island (Solomon Islands), Waigeo Island (New Guinea) and Obi and Aru islands (the Moluccas). We also update a description of its morphology, in particular on stylar characteristics based on new materials. A key to the Japanese species of Sciaphila based on total flower and stylar characteristics is also provided for easy identification of these rare mycoheterotrophic plants.