Phlegmariurus lancifolius, V.T. Tran & N.V. Duy

Tran Thai Vinh, Hoang Nghia, Tien Chinh Vu, Le Ngoc Trieu, Hoang Viet Hau & Van Tien Tran, 2016, A new combination and a new species in Phlegmariurus (Herter) Holub (Lycopodiaceae) from Southern Vietnam, Adansonia 38 (2), pp. 151-157 : 152-156

Phlegmariurus lancifolius

V.T. Tran & N.V. Duy, sp. nov.

( Fig. 3 )

A Phlegmariuro obovaliFolio (Bonap.) V.T. Tran & N.V. Duy, comb. nov., lanceolatis foliis paulo majoribus, apice acuminato apiculato; sporangiis reniformibus non orbiculatis praecipue differt.

Typus. — Vietnam. Lam Dong Province, Lac Duong District, Lang Bian mountain , elevation 2014 m, 12°02’6.54’’N, 108°26’02.78’’E, 20.VIII.2013, Duy N.V. & V.T. Tran 0 0 0 11 (holo-, Da Lat University – DLU!); iso-, Tay Nguyen Institute For Scientific Research – VTN!).

paraTypes. — Vietnam. Annam, Ba Na, elevation 1500 m a.s.l., 15.VII.1923, Poilane 7205 (P[P01228678]!); Annam, Dent du Tigre, Quảng Trị Province, elevation 1200 m asl, 27.XI.1924, Poilane 10302 (P[P01228677!, P01228685]); Annam, MassiF du Lang Bian, elevation 2000-2500 m asl, 16.X.1919, Chevalier 30878 (P[P01228674]!); Annam, MassiF du Braian, près de Dfiring, du Haut Donai Prov., Poilane 23942 (P[P01228681!, P01293442]); Dalat, 6.VI.1921, Hayata 127 (P[P01228679]!); Quangnam-Danang Province, Ngoc Linh Mountain, elevation 1800 m asl, 24.III.1995, VH 914 (P[P01216719]!).

DisTribuTion, habiTaT. — Epiphytic on tree trunks in broad leaves and cloud Forests, high mountain, 1000-2400 m. Lang Bian, Braian, Lam Đong Province; Ba Na, Đa Nang City; Quang Tri Province. And the species easily recognized by lanceolate-acuminate with apex acuminate.

eTymology. — The species epithet reFers to the lanceolate leaves shaped.

DescripTion Lycophytes. Plants terrestrial, erect when young and ascending when mature, Forming small clumps, 1-4 times dichotomously branched, 30-40 cm long.Shoots almost homophyllous or slightly smaller in terminal division, and equally thick throughout, main stems together with leaves c. 4 mm in diam., cordlike. Stems excl. leaves 1-2.5 mm at the base, almost completely concealed by leaF bases. Leaves densely crowded at the base and slightly spaced near terminal divisions. Sterile leaves lanceolate, spiral spreading, leathery, 1.1-1.5 × 0.4-0.6 cm, firmly coriaceous, green, apex acuminate, base narrow, sessile, abaxially flat, with slightly prominent vein abaxially and adaxially, at least in the basal halF with a distinct, margin entire. Strobili terminal on branches, linear, 0-2 times dichotomously branched, 4-8 × 0.2- 0.5 cm. Sporophylls coriaceous, sparsely arranged, cuneiForm or broadly ovate, c. 2 × 2 mm, midrib distinct, margin entire, apex acuminate with tip apiculate, c. 2 mm, base sessile. Sporangia in axils oF sporophylls oF upper portion oF stem or branchlets, yellowish, reniForm shaped, slightly flat, c. 2 × 2 mm, vertically bisected. Spores with convex lateral margins.

remarks

This remarkable species is distinguished From the closely related P. obovalifolius by its leaves lanceolate, apex acuminate with tip apiculate, 1.1-1.5 × 0.4-0.6 cm, apex acuminate, sporophyll cuneiForm or broadly ovate, c. 2 × 2 mm, apex acuminate with apiculate tip, c. 2 mm, sporangia reniForm.

Figures

FiG. 3. — Phlegmariurus lancifolius V. T. Tran & N. V. Duy, sp. nov.: A, habit; B, segment of leafy branch; C, strobili; D, segment of strobili; E - F, ventral and dorsal views of sporophyll; G, sporangium. Duy N. V. & V. T. Tran 0 0 0 11 (holo-, DLU!). Drawn by Tran Van Tien. Scale bars: A, 4 mm; B, 5 mm; C, 2 cm; E, 1 mm.