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Parathelypteris angulariloba

Description from Flora of China

Thelypteris angulariloba Ching, Bull. Fan Mem. Inst. Biol., Bot. 6: 323. 1936; Coryphopteris angulariloba (Ching) L. J. He & X. C. Zhang; Lastrea angulariloba (Ching) Tagawa; L. simozawae (Tagawa) Tagawa; Parathelypteris simozawae (Tagawa) Ching; T. simozawae Tagawa; Wagneriopteris angulariloba (Ching) A. Löve & D. Löve.

Plants 30-60 cm tall. Rhizomes short, decumbent or ascending, nearly black. Fronds subclustered; stipes 10-30 cm, bases nearly black, with dense spreading multicellular acicular hairs, distally castaneous-red or castaneous-brown, subglabrous; laminae narrowly oblong, 17-30 × 6-12 cm, bases not tapering, pinnate-pinnatifid, apices acuminate and pinnatifid; pinnae ca. 20 pairs, alternate, proximal pair not reduced, ± reflexed; middle pinnae lanceolate or linear-lanceolate, 5-6 × 0.7-1.5 cm, bases truncate, ± symmetrical, sessile, pinnatifid and reaching 1/3-1/2, apices acuminate and pinnatifid or sometimes entire; segments 8-12 pairs, rectangular or subsquare, 3-5 × ca. 3.5 mm, entire, apices rounded or rounded-truncate and with 2-4 blunt angles. Veins evident, lateral veins simple, 2 or 3(or 4) pairs per segment, proximal pair arising from above base of costules. Laminae thickly herbaceous, greenish when dry, abaxially along costae and main veins with multicellular short acicular hairs, sometimes with mixed orange capitate glands; adaxially along costal grooves with acicular hairs, elsewhere glabrous. Sori orbicular, dorsifixed at middle of lateral veins, 1 or 2 pairs per segment; indusia medium-sized, orbicular-reniform, brown, thickly membranous, with dense grayish white short setae, persistent.

Streamsides in valley forests, shaded wet places in thickets; 400-1100 m. N and SE Fujian, N and SE Guangdong, E Guangxi, Taiwan [Japan].


 

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