Polystichum prionolepis Hayata

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 : 133

Polystichum prionolepis Hayata ( Fig. 11 )

Type:— TAIWAN. Chiayi County, Arisan, Hayata & Sasaki s.n. (holotype: TI).

Voucher specimens examined:— VIETNAM. Lam Dong Province, Lac Duong District, Da Chais Commune, Bidoup - Nui Ba National Park, along trail to Mt. Bidoup , ca. 1880 m, 12.069° N, 108.649° E, 22 June 2018, C.- W. Chen Wade5108 ( SGN!, TAIF!, SING!) ; same locality, 19 June 2013, C.- W. Chen Wade2659 (TAIF-440009!) .

Additional specimens examined:— TAIWAN. Chiayi County, Arisan , 2400 m, 1 September 1991, B.- J. Wang 18645 ( TAIF163671 !) ; Taichung County, Dasyueshan Forest Recreation Area , 23 October 2016, P.- F. Lu 30065 (TAIF-502911!) .

Distribution:—Previously only known from Taiwan and Yunnan Province of China.

Ecology:—In Vietnam, this species grows on earthy ground under broad-leaved evergreen forest along the trail near ridge.

Note:—This species belongs to Polystichum sect. Macropolystichum Daigobo ( Zhang & Barrington 2013) . In Vietnam, sect. Macropolystichum is a group of moderate size with about 8 representatives. Polystichum prionolepis can be distinguished from other species in the same section by having the combination of following characters: lamina less divided (1-pinnate to bipinnatifid), broadly lanceolate, with 1 proliferous bud near the apex.

Figures

FIGURE 11. Polystichum prionolepis—A. Habit. B. Stipe scales. C. Bud on distal lamina. D. Adaxial pinnae. E. Sori. C.-W. Chen Wade5108.