阔片双盖蕨 kuo pian shuang gai jue

Athyrium matthewii Copeland, Philipp. J. Sci., C, 3: 278. 1908; Allantodia matthewii (Copeland) Ching; Diplazium grosselobatum C. Christensen.

Plants evergreen, medium-sized. Rhizome creeping, brown, 1-2.5 mm in diam., densely scaly at apex, then glabrous; scales brown, lanceolate, ca. 1 cm, membranous, sparsely toothed at margin; fronds approximate. Fertile fronds up to 1 m; stipe brown at base, upward light green-stramineous, up to 40 cm, 6-10 mm in diam., base with sparse lanceolate brown scales, upward glabrous, shallowly grooved adaxially; lamina 1- or 2-pinnate at base, deltoid, up to 70 × 50 cm at base, acuminate; pinnae ca. 8 pairs, alternate, ascending, broadly lanceolate, up to 30 × 12 cm, base broad, slightly asymmetrical, truncate or shallowly cordate, with stalk up to 2 cm, pinnatilobate to narrowly ovate or oblong broad lobes, or basal 1 pair of lobes broad and shortly stalked, apex acuminate; pinna lobes up to 12 pairs, alternate, spreading, up to 8 × 2.4 cm, base truncate, basal basiscopic lobe larger, margin crenate or subentire near base, apex shortly acuminate, acute, or rounded; veins not prominent adaxially, visible abaxially, pinnate, veinlets 3-5 pairs, simple, ascending, occasionally 1 basal pair united. Lamina herbaceous, glabrous on both surfaces; rachis light green-stramineous or dark stramineous, glabrous, shallowly grooved adaxially. Sori linear, ascending, 1 or 2 pairs, simple or double, from midrib to 2/3 of veinlet length or nearly to pinna margin; indusia brown, linear, membranous, entire, persistent. Spores hemispherical, perispore prominent, slightly rugate on surface.

Beside streamlets in forests; ca. 300 m. Fujian, Guangdong, Guangxi [N Vietnam].