无量山钩毛蕨 wu liang shan gou mao jue

Plants ca. 65 cm tall. Rhizomes short and thick, decumbent or ascending, including stipe bases with sparse brown ovate-triangular hairy scales and grayish white dense short hairs. Fronds approximate; stipes 25-28 cm, bases blackish brown, distally stramineous, polished and sparsely grayish white shortly hairy; laminae oblong-lanceolate, 35-40 × 10-16 cm, tapering to bases, pinnate-pinnatifid, acuminate and pinnatifid at apices; pinnae 14-20 pairs, alternate or proximal ones subopposite, proximal 2 or 3 pairs of pinnae gradually shortened and reflexed, proximal pair shortest, but similarly shaped, ca. 2 cm; middle pinnae linear-lanceolate, 6.5-9.5 × 1.5-2 cm, bases not tapering, rounded-truncate, pinnatifid to 4/5 of distance to costae, apices caudate or entire; segments ca. 14 pairs, oblong, 6-8 × 3-3.5 mm, entire along margins and ± recurved proximally, rounded at apices. Veins evident, veinlets simple, ca. 8 pairs per segment, proximal pair arising from base of costules and all reaching margins above sinus. Laminae herbaceous, glabrous or brownish green, abaxially including costae and costules with dense short acicular hairs, adaxially with dense short hairs along costal grooves and with sparse long acicular hairs along costules, with sparse appressed short hairs on intercostal areas, rachises with dense short acicular hairs and sparse long acicular hairs, abaxially with brown aerophores. Sori orbicular, attached near bases of veinlets and extremely close to costules, 6 or 7 pairs per segment and confluent when mature. Sporangia each with 1 or 2 setae at tops.

● Shaded wet streamsides in forests; ca. 2400 m. SW Yunnan (Jingdong).