Tectaria fungii S.Y. Dong, 2022

Dong, Shi-Yong, Li, Shu-Hang, Huang, Ling, Tan, Shi-Shi & Zuo, Zheng-Yu, 2022, A phylogenetic and morphological study of the Tectaria fuscipes group (Tectariaceae), with description of a new species, PhytoKeys 195, pp. 75-92 : 75

Tectaria fungii S.Y. Dong sp. nov.

Figs 1D , 4A , 6 , 7

Type.

China. Hainan: Lingshui , 3-20 May 1932, H. Fung 20093 (holotype, two sheets, BM-000801750!, BM-000801751!; isotypes: E!, K!, US-01580253!, US-01580666!) .

Diagnosis.

Tectaria fungii is similar to the sympatric species T. subsageniacea and T. kusukusensis . It differs from T. subsageniacea in its broader (1-1.5 mm versus 0.5-1 mm), brown or obviously bicolour (castaneous with brown margins) (versus black) stipe scales and from T. kusukusensis by its nearly hairless laminae (versus frond axes abaxially bearing copious hairs).

Description.

Rhizome short, erect. Fronds slightly dimorphic, rarely obviously dimorphic. Stipe stramineous or dark brown, ca. 4 mm in diameter, 50-60 cm long, bearing copious scales towards base and fewer on upper part. Scales lanceolate, ca. 6-7 × 1-1.5 mm, brown or castaneous with pale margins. Lamina oblong, 55-78 × 30-45 cm, round at base, somewhat suddenly narrowed and acute towards apex, 1-pinnate-pinnatifid, free pinnae (6) 9-12 pairs; basal pinnae triangular, deeply lobed to 1-pinnate at base, (18) 24-26 × 13-18 cm, shortly stalked (0.5-2 cm), with basal basiscopic 2-3 pinnules free and markedly prolonged (up to 16 × 3.5 cm), pinnatifid upwards, acuminate at apex; suprabasal pinnae linear, 16-24 × 3.8-5 cm, sessile or very shortly stalked, deeply lobed 2/3-3/4 of the way to costae, with a pair or only the basal basiscopic lobes almost free; lobes or pinnules anadromous on basal pinnae and catadromous on pinnae above, basal acroscopic lobes slightly prolonged and parallel to rachis, basal basiscopic lobes obliquely spreading, lobes entire (except for those on the base of lower pinnae, which are crenate to pinnatifid), obtuse or acute at apex, sterile lobes larger, usually 2-2.4 × 0.8-0.9 cm, fertile lobes 1.6-1.8 × 0.6 cm. Veins free, simple or mostly once forked. Hairs short, relative dense on adaxial surface and sparse on abaxial surface of costae; no hairs on abaxial surface between veins; with a few hairs on adaxial surface of lamina, especially on margin and at sinus between lobes. Sori terminal on simple veins or on the acroscopic branch of a forked vein, in one row on either side of mid-rib of lobes, medial between mid-rib and margin of lobes. Indusia round-reniform, ca. 1 mm in diameter, persistent, usually ciliate at margin.

Additional specimens examined.

China. Hainan: Baisha, S.Y. Dong 728 (PE); Baoting, G.A. Fu 2951 (IBSC); Ledong, S.Y. Dong 1589 (IBSC); Qiongzhong (Mt. Limushan), S.Y. Dong 832 (PE); Mt. Wuzhishan, C. Wang 35347 (IBK, IBSC, PE); S.Y. Dong 5096 (IBSC), Wuzhishan Fern Survey 036, 176, & 498 (PE); Mt. Yinggeling , S.Y. Dong 3834, 3842, 3867, 4430 (IBSC). Yunnan: Jinghong, B.G. Li 98162 (HITBC), Q.J. Li 42730 (HIBTC); Menghai, W.M. Chu et al. 15749 (GAUA, PYU), H. Shang SG2638 (CSH), X.L. Zhou 5727, 5731 (CSH); Mengla (Bubeng), S.Y. Dong 4307, 4334, 4825 (IBSC). VIETNAM. Dak Nong: Dak Plao, L. Averyanov et al. 5589 (HN), 5601 (HN, HNU) .

Distribution and Habitat.

China (Hainan, southern Yunnan) and Vietnam (Dak Nong); terrestrial in montane rainforest, occurring in dense-shady and wet slopes, elev. 600-1300 m, locally common.

Etymology.

The specific epithet honours Mr. Hom Fung, who collected lots of plant specimens in Hainan and Guangdong, southern China in 1930s. This species was probably first collected by him from Hainan in 1932.

Figures

Figure 1. Comparison of stipe scales in Tectaria fuscipes and morphologically similar species A T. fuscipes (Dong 5194, IBSC) B T. subsageniacea (Dong 4270, IBSC) C T. subfuscipes (Chang 20140503021, TAIF) D T. sp. (Dong 5096, IBSC) E T. setulosa (Dong 4782, IBSC) F T. ingens (Miehe et al. 13093007, SING) G T. kusukusensis (Dong 4851, IBSC) H T. paradoxa (Fraser-Jenkins FN 77, TAIF) I T. dissecta (Chang 20160125, TAIF).

Figure 4. Two states of sori arrangement in the Tectaria fuscipes group A sori medial, borne on segments almost from base to tip as in T. sp. (Dong 1589, IBSC) B sori supramedial, borne on distal half of segments in T. paradoxa (Thwaites 3061, BO, TUB).

Figure 6. Holotype of Tectaria fungii (Fung 20093, BM), sp. nov. A frond's upper half B frond's lower half C details of middle pinnae (abaxial view).

Figure 7. Morphology of Tectaria fungii, sp. nov. A paratype specimen (Dong 3834, IBSC), showing outline of a frond B habit in the wild C portion of a middle pinna, showing veins and sori D scales on basal stipe. (All from Dong 3834).