57. Pteris angustipinnula Ching & S. H. Wu, Acta Bot. Austro Sin. 1: 11. 1983.
线裂凤尾蕨 xian lie feng wei jue
Plants ca. 1 m tall. Rhizome not seen. Stipe 43-65 cm, ca. 3 mm in diam., sparsely scaly; stipe apically straw-colored, or slightly dark chestnut, slightly lustrous, glabrous, grooved adaxially; scales brown, lanceolate, ca. 2 mm, gradually deciduous; rachis straw-colored, glabrous, adaxially grooved; lamina 2- or 3-pinnatipartite, oblong-ovate in outline, 35-45 × 16-24 cm; lateral pinnae 5-7 pairs, opposite, slightly decumbent, basal pairs 5.5-7.5 cm apart; basal pair slightly shortly stalked; distal pairs sessile, median pinnae broadly lanceolate, 17-22 × 4-6.5 cm, base rounded-cuneate, pectinately divided with narrowly winged costa, apex caudate-acuminate (4-5.5 mm); pinnae asymmetrical; basal pairs slightly wider, with 1 or 2 basiscopic pinnules similar in shape to main part of pinna but smaller; segments 21-25 pairs, opposite or alternate, decumbent, 2-4 mm apart, linear-lanceolate, somewhat falcate, basal segments slightly shorter; middle segment 25-40 × 4-5 mm, apical segment shorter and becoming narrow, obtuse, slightly expansive at base, entire; terminal pinna similar to lateral pinnae, but wider, and shortly stalked (5-15 cm); costae and midvein prominent abaxially, light straw-colored, glabrous, adaxially grooved, with needlelike flat spines along groove of costae, and with a few needlelike spines along midvein; veins conspicuous on both sides, 2-forked, decumbent, oblique, basiscopic vein at segment base arising from rachis, and acroscopic vein together extending up to margin of incision; lamina gray-green, papery when dried, glabrous, or rarely minutely puberulent. Indusia gray-brown, linear, membranous, entire, persistent.
● Forests in valleys. SW Guangxi (Fusui, Longjin).
Pteris angustipinnula is similar to P. fauriei, but differs in having linear-lanceolate segments that are distant from each other.