Asplenium cyrtosorum K.W.Xu, Li Bing Zhang & W.B.Liao

Xu, Ke-Wang, Lu, Ngan Thi, Zhou, Xin-Mao, Zhang, Liang & Zhang, Li-Bing, 2021, Asplenium quangbinhense sp. nov. and three new records of Asplenium (Aspleniaceae) from Vietnam, Phytotaxa 521 (2), pp. 113-120 : 116-117

Asplenium cyrtosorum K.W.Xu, Li Bing Zhang & W.B.Liao ( Figure 3 )

Type:— CHINA. Yunnan: Pu’er City, Pu’er Sun River National Forest Park, elev. ca. 1200 m, 22°34’51.74”N, 101°6’31.57”E, 20 April 2017, Ke-Wang Xu & Lei Jiang XKW318 (holotype SYS!) .

Additional specimens examined:— CHINA. Yunnan: Pu’er City, Pu’er Sun River National Park, elev. ca. 1200 m, 22°34’51.74”N, 101°6’31.57”E, 18 May 2016, Lei Jiang & Hua Peng JL00363 ( SYS). VIETNAM. Quang Binh: Minh Hoa district, Dan Hoa Commune, Chalo village, 600 m, 17°40’26.43”N, 105°46’39.19”E, 13 November 2014, Li-Bing Zhang , Liang Zhang & Ngan Thi Lu 7440 ( MO); Dak Nong: Dak Glong district, Dak P’lao Commune, Ta Dung Nature Reserve, 1200–1400 m, 11°52’17.98”N, 108°1’36.98”E, 13 November 2006, Su-Kong Wu et al. WP1557 (MO-5959537).

Distribution:—Currently only known from southwestern China and Vietnam.

Ecology:—This species grows in broad-leaved forests. It is a lithophyte on rocks in humid and shady conditions.

Note:—One population of 40–50 individuals was first found in China and it was classified as Critically Endangered according to the IUCN guidelines ( Xu et al. 2018a). Two small populations were found in Vietnam, in Quang Binh and Dak Nong, respectively. Morphologically, plants from Vietnam are more robust than those from China.

Figures

FIGURE 3. Asplenium cyrtosorum.—A. Habit.—B. Pinna showing soral distribution.—C. Abaxial view of upper portion of lamina, red arrow indicating gemma.