Pteris latipinna Y.S.Chao & W.L.Chiou, 2017

Chao, Yi-Shan, Ebihara, Atsushi, Chiou, Wen-Liang & Huang, Yao-Moan, 2017, Pteris latipinna sp. nov. (Pteridaceae), a new species segregated from Pteris fauriei, PhytoKeys 85, pp. 95-108 : 99

Pteris latipinna Y.S.Chao & W.L.Chiou sp. nov. Figs 1 , 3

Type.

TAIWAN. Hsinchu County: Zhudong Town, Wuchihshan , 3 March 2013, Y.-S. Chao 2092 (holotype TAIF!, isotype TAIF!, TNS!) .

Description.

Rhizomes short, ascending, apex scaly; scales linear lanceolate, 1-4 mm long, 0.2-0.5 mm wide, concolorous, dark brown, entire, apex long-acuminate. Fronds clustered, 30-100 cm long, nearly monomorphic. Sterile fronds 30-70 cm long; stipes green, 2-4 mm thick, 10-30 cm long, base with persistent and scattered scales; grooved on the adaxial side; laminae widely ovate, 15-45cm long, 15-40 cm wide, bipinnatifid; 2-3(4) pairs lateral pinnae, pinna angle against rachis 60-70°, straight, basal pinnae with one pair of exaggerated basiscopic pinnules, terminal pinnae distinctly longer and wider than the lateral except basal ones; pinnae ovate-lanceolate, distinctly narrowed at base, pectinate, 8-21 cm long, 3-7 cm wide, sessile or short-petiolate, apex caudate, 1-4 cm long. Basal segments of the lateral pinnae triangular, the other segments of pinnae falcate, 4-9 mm wide, apex obtuse, margins entire; veins forked, free. Fertile fronds 50-105 cm long; stipes 25-55 cm long; laminae ovate to widely ovate, 20-50 cm long, 20-35cm wide, bipinnatifid; 3-5 pairs lateral pinnae, slightly incurved or straight; terminal pinna usually wider than the lateral; pinnae 8-20 cm long, 2-6 cm wide, 1-4 cm long; segments of pinnae 4-6 mm wide, apex acute or obtuse. Sori along pinna margins, protected by pseudoindusia; spore number 32; spores tetrahedral, tan.

Other specimens examined.

TAIWAN. Hsinchu County: Guanxi, Chike Mt. , P.-F. Lu 24585, 24586 (TAIF); Jianshi, P.-F. Lu 25108 (TAIF); Pawushan, P.-F. Lu 26666, 26673 (TAIF); Shuitien Logging Trail, L.-Y. Kuo 01 (TAIF) . Miaoli County: Sintikusyu, komokwan, Yaiti Simada 5175A (HAST).

Distribution.

Taiwan (Fig. 4 ).

Ecology.

In shaded places, understory of evergreen broad leaf forests, below 1,000 m in elevation.

Etymology.

The specific epithet ' latipinna ' refers to its wide pinnae.

Preliminary conservation assessment.

We investigated the distribution of P. latipinna Y.S.Chao & W.L.Chiou, sp. nov. in Taiwan. To date, only a few small populations are recorded. However, the available information is inadequate to support the assessment of its extinction risk. According to the IUCN (2012) criteria, the category of Data Deficient (DD) is appropriate.

Figures

Figure 1. Photographs of Pteris latipinna Y. S. Chao & W. L. Chiou, sp. nov. in Hsinchu, Taiwan. A Habitat. Terminal pinna of sterile frond is larger than the lateral pinna. St, sterile fronds; Fe, fertile fronds B A frond C Concolorous scales a stipe.

Figure 3. Illustration of Pteris latipinna Y. S. Chao & W. L. Chiou, sp. nov., based on holotype. A A fertile frond B Venation C Linear, concolorous scale. Basal segments of lateral pinnae are triangular (indicated by arrows).

Figure 4. Distribution of Pteris latipinna Y. S. Chao & W. L. Chiou, sp. nov. (black circles) in Taiwan.