Asplenium pseudopraemorsum Ching & Wang, 1964

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 : 119

Asplenium pseudopraemorsum Ching & Wang ( Figure 5 )

Type:— CHINA. Hainan: Ling-shui Hsien, Seven Finger Mountain (?Baoting, Qixianling), 13 January 1934, C. Wang et al. 36520 (holotype, PE-01768892!) .

Additional specimens examined:— CHINA. Hainan: Baoting, Qixianling , elev. ca. 500 m, 26 December 2008, X. C . Zhang et al. 5516 (PE-01857945!); same locality, 13 December 2012, In-Chun Hwang cn0070 (PE-01962734); same locality, 800 m, 18°42′43.15′′N, 109°42′8.76′′E, February 2017, K. W . Xu 264 ( SYS) . VIETNAM. Khanh Hoa: Hon Ba Nature Reserve, stream behind Yersins house, 1300–1400 m, 24 October 2015, Li-Bing Zhang , Xin-Mao Zhou, Thien Tam Luong, Minh Tri Dang & Bich Ha Duong 8732 ( CDBI, MO, PHH) .

Distribution:—(Hainan Island) China and Vietnam.

Ecology:—In Vietnam, Asplenium pseudopraemorsum grows in damp broad-leaved forests as a lithophyte.

Note:— Asplenium pseudopraemorsum was originally described based on a single collection from Hainan island in southern China ( Ching & Wang 1964). It is morphologically most similar to A. aethiopicum (Burman f. 1768: 32) Becherer (1935: 23), but the former is 40–45 cm tall, pinnae 3–3.5 cm long, pinna stalks 2–4 mm long, and lamina and rachis without reddish brown fimbriate scales, whereas the latter is 25–45 cm tall, pinnae 2.5–4.5 cm long and subsessile, and lamina and rachis with reddish brown fimbriate scales. This species was previously thought to be endemic to Hainan Island with very narrow distribution in China, and it appears to be very rare in Vietnam.

Figures

FIGURE 5. Asplenium pseudopraemorsum.—A.Abaxial view of lamina.—B, C.Abaxial views of portion of lamina.—D. Lower portion of stipe showing stipe scales.—E. Lower portion of plant showing rhizome scales.