Ctenopterella khaoluangensis (Tagawa & K.Iwats.) Parris

Chen, Cheng-Wei, Hsu, Tian-Chuan, Chao, Yi-Shan, Lu, Ping-Fong, Li, Chia-Wei, Tram, Nguyen Khanh Trinh, Nguyen, Ich Le Phuoc Thanh, Dang, Minh Tri, Luu, Hong Truong & Parris, Barbara, 2020, A newly recorded genus and twelve newly recorded species of ferns for Vietnam from Lang Biang Plateau, Phytotaxa 443 (2), pp. 121-143 : 127

Ctenopterella khaoluangensis (Tagawa & K.Iwats.) Parris ( Fig. 6 )

Basionym: Xiphopteris khaoluangensis Tagawa & K.Iwats. (1969: 177)

Type:— THAILAND. Nakhon Si Thammarat Province, Mt. Khao Luang, 23 August 1967, K. Iwatsuki et al. T /14594 (holotype: KYO!, image seen, isotypes: BKF, K-001044421!, L-0052403!).

Voucher specimens examined:— VIETNAM. Lam Dong Province, Lac Duong District , Da Nhim Commune, Dung Iar Rieng station, 1750 m, 27 June 2018, T.- C. Hsu 10777 ( SGN!, TAIF!) ; Lac Duong District , Dạ Chais Commune, Mt. Bidoup, 2100 m, 22 June 2018, T.- C. Hsu 10789 ( SGN!, TAIF!) ; Lac Duong District , Lat Commune, Cong Troi Station, 1700–1800 m, 10 June 2019, T.- C. Hsu 11730 ( SGN!, TAIF!) ; Lac Duong District , Dạ Chais Commune, Mt. Gia Rich, 1700 –1800 m, 24 October 2019, T.- C. Hsu 12209 ( SGN!, TAIF!) .

Additional specimens examined:— MALAYSIA. Pahang, Cameron Highlands, Gunung Batu Brinchang , 2035 m, 22 March 2007, Phoon FRI 53376 (KEP-143299!) ; Pahang, Fraser’s Hill, Pine Tree Trail , 1200–1500 m, 14 April 2015, C.- W. Chen Wade4408 ( AK 359312 !, TAIF- 465321!) ; Selangor, Gunung Ulu Kali , 10 November 1974, A. G. Piggott 1285 (K-000474002!) .

Distribution:—Previously only known from peninsular Thailand and peninsular Malaysia.

Ecology:—In Vietnam, this species has been found in cloudy ridge-top evergreen broad-leaved forests at the elevation of 1700–2100 m. There it grows as an epiphyte on moss-covered canopy branches along with epiphytic orchids (e.g., Bulbophyllum and Panisea spp. ) and ferns (e.g., Scleroglossum and Radiogrammitis spp. ).

Note:—This is the third species of Ctenopterella Parris known from Vietnam ( Parris et al. 2015), and it can be distinguished from the other two, C. blechnoides (Grev.) Parris (2007: 235) and C. nhatrangensis (C.Chr. & Tardieu) Parris (2013: 207) , by the combined characters of erect or ascending rhizomes and each fertile segment with a conspicuous acroscopic tooth at base.

Figures

FIGURE 6. Ctenopterella khaoluangensis—A. Habit. B. Rhizome. C. Sori. D. Adaxial lamina. T.-C. Hsu 12209.