Lecanorchis nigricans Honda var. yakusimensis T.Hashim. emend. Suetsugu & Fukunaga

Suetsugu, Kenji, Shimaoka, Chie, Fukunaga, Hirokazu & Sawa, Shinichiro, 2018, The taxonomic identity of three varieties of Lecanorchis nigricans (Vanilleae, Vanilloideae, Orchidaceae) in Japan, PhytoKeys 92, pp. 17-35 : 28-29

Lecanorchis nigricans Honda var. yakusimensis T.Hashim. emend. Suetsugu & Fukunaga Figs 6 , 7

Type.

Japan, Kagoshima Pref., Yakushima Island, along the Hanaage River , 21-27 July 1986, Y. Hanei s.n. (holotype TNS!) .

Emended description.

Terrestrial, mycoheterotrophic herb. Inflorescence 10-25(-30) cm tall, solitary or branched at lower-half, purplish-white at flowering, black at fruiting, glabrous, ca. 0.8-1.5 mm in diam., with scale-like sheaths. Rhizome erect, J-shaped or complex, ligneous. Roots simple, radiate numerous, horizontally or downward elongate to 20-30 cm long, yellowish brown. Rachis 2-8 cm, 3-15 flowered, internode length of upper-half of rachis, 1-6(-10) mm. Floral bracts triangular, acute, 0.7-2.0 mm long. Pedicellate ovary ascending, 14-30 mm long. Flowers widely opening, ca. 2.5 cm in diameter. Sepals purplish white, linear, oblanceolate-spatulate, ca. 13-17 mm long, 3.3-4.0 mm wide, apex obtuse. Petals purplish white, linear, oblanceolate-spatulate, 13-17 mm long, 3.3-4.0 mm wide, apex obtuse. Lip spatulate to cucullate, strongly concave, 12-15 mm long, ca. 4.5 mm wide in natural situation, 7.5-8.0 mm wide when flattened, disc with rather scarce, long multicellular hairs which are rarely branched, near apex. Column 10-13 mm long, recurved, fused with lip about 1/2 its length, ventrally densely puberulent; anther purplish white, ca. 2.0 mm wide. Capsule 20-30 mm long, cylindrical-fusiform, black, ascending at 70-90 degree angle from axis. Flowering in mid-July to mid-September.

Additional specimens examined.

JAPAN. Kagoshima Pref., Yakushima Island: along Hanaage River, 17 July 2015, Hiroaki Yamashita s.n. (OSA, in spirit collection), along Hanaage River , 27 July 2017, Hiroaki Yamashita s.n. (OSA, in spirit collection), along Osaki River , 17 July 2015, Hiroaki Yamashita s.n. (OSA, in spirit collection), along Nakase River , 17 July 2015, Hiroaki Yamashita s.n. (OSA, in spirit collection), Haruhira, 17 July 2015, Hiroaki Yamashita s.n. (OSA, in spirit collection), along Futamata River , Mt. Mochomu , 26 July 1991, Yoshie Hanei s.n. (TSN), along Futamata River , Mt. Mochomu , 26 July 1991, Yoshie Hanei s.n. (TSN), Kurio, 5 Aug. 1975, Doi s.n. (TSN) .

Figures

Figure 6. Dissected flowers of Lecanorchis nigricans var. yakusimensis collected in type locality on 17 July 2015 (OSA). A Flower and pedicellate ovary B Dissected flower C-D Lip and column E Column F Hairs at anterior disc of lip G Pubescence at the ventral side of the column. Scale bars: A-E 5 mm F-G 0.5 mm. Photographed by Takuto Shitara.

Figure 7. Lecanorchis nigricans var. yakusimensis collected in type locality on 17 July 2015 (OSA). A Flower and pedicellate ovary B Column C Lip and column D Dorsal sepal E Lateral petal F Lateral sepal G Flattened lip H Anther cap. Scale bars: A 1 cm B-G 3 mm H 1 mm. Line drawings by Kumi Hamasaki.