柔软马尾杉 rou ruan ma wei shan

Urostachys salvinioides Herter, Philipp. J. Sci. 22: 67. 1923; Huperzia salvinioides (Herter) Holub; Lycopodium salvinioides (Herter) Tagawa; U. formosanus Herter ex Nessel.

Lycophytes, medium-sized. Stems caespitose, slender and pendulous, 6-10 times forked, 20-40 cm, main stems ca. 3 mm in diam., stem together with leaves flat or nearly flat, not cordlike. Leaves conspicuously dimorphic. Trophophylls obliquely spreading, not lustrous, ovate, 5-10 × 3-5 mm, leathery, abaxially flat, midrib distinct, base rounded, decurrent, shortly stipitate, margin entire, apex acuminate. Strobili terminal on branches, linear, 10-15 cm. Sporophylls sparsely arranged, ovate, ca. 1 × 0.7 mm, midrib distinct, base rounded, margin entire, apex acute. Sporangia yellowish, reniform, vertically bisected.

Epiphytic on tree trunks; 200-800 m. E and S Taiwan [Japan, Philippines].

The trophophylls of Phlegmariurus salvinioides are ovate, rounded at the base, and shortly stipitate.