Dryopteris hendersonii (Bedd.) C.Chr.

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 : 132

Dryopteris hendersonii (Bedd.) C.Chr. ( Fig. 8 )

Basionym: Lastrea hendersonii Bedd. (1876) .

Type :— INDIA. Khasya , Shillong Hill, Henderson s.n. (not found at K). Neotype (designated by Zhang & Zhang 2012): Lastrea hendersonii

Bedd., Suppl. Ferns S. Ind.: t. 377. 1876.

Voucher specimens examined:— VIETNAM. Lam Dong Province, Lac Duong District, Da Chais Commune, Bidoup - Nui Ba National Park, Mt. Bidoup, the valley behind the camping site, 2017 m, 12.067° N, 108.650° E, 23 June 2018, C.- W. Chen Wade5094 ( SGN!, TAIF!, SING!).

Additional specimens examined:— INDIA. Meghalaya, West Khasi Hills District, Mairang, 28 February 2009, C. R. Fraser-Jenkins FN92 (TAIF-319305!). TAIWAN. Nantou County, Mt. Chinkanshu, 22 July 2016, P.- F. Lu 29623 (TAIF-496043!).

Distribution:—Previously known from India, Nepal, Myanmar, Bhutan, Thailand, Borneo, Philippines China, Taiwan, and Japan.

Ecology:—In Vietnam, this species was found in mossy broad-leaved primary forest. There it grows on slopes with shades and moisture.

Note:—This species was formerly placed in the genus Nothoperanema (Tagawa) Ching. Zhang & Zhang (2012) redefined a broadly-circumscribed Dryopteris based on molecular phylogenetics and it is now included in Dryopteris subg. Nothoperanema sect. Nothoperanema . In Vietnam, four species of Dryopteris subg. Nothoperanema are currently known and Dryopteris hendersonii is the only member of sect. Nothoperanema . Morphologically, it is most similar to the species of sect. Diacalpe including D. annamensis (Tagawa) Li Bing Zhang (2012: 1210) and D. pseudocaenopteris (Kunze) Li Bing Zhang (2012: 1209) but can be delimitated from them by having superior (above sori) indusia.

Figures

FIGURE 8. Dryopteris hendersonii—A. Habit. B. Rhizome. C. Stipe scales. D. Adaxial side of pinnae. E. Sori. F. Venation (backlight). C.-W. Chen Wade5094.