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FOC | Family List | FOC Vol. 2-3 | Thelypteridaceae | Metathelypteris

8. Metathelypteris petiolulata Ching ex K. H. Shing, Fl. Reipubl. Popularis Sin. 4(1): 321. 1999.

有柄凸轴蕨 you bing tu zhou jue

Plants 55-65 cm tall. Rhizomes short and decumbent. Fronds subclustered; stipes 23-30 cm, dark brown, with dense grayish white acicular hairs, distally stramineous, subglabrous, polished. Laminae ovate-triangular, 30-40 cm, broadest at bases and similar in size as length, bases broadly cordate, 3-pinnate to 4-pinnatifid, apices acuminate and pinnatifid; pinnae 10-12 pairs, ascending, proximal ones opposite or subopposite, stalk 3.5-5 cm, distal ones alternate, sessile; proximal pair largest, triangular-lanceolate, 17-22 × 10-12 cm, bases subtruncate, 2-pinnate to 2-pinnate-pinnatifid, apices caudate-acuminate; pinnules 10-15 pairs, alternate or subopposite, approximate, short stalks of proximal several pairs 4-7 mm, distal ones sessile, basiscopic pinnules of costae longer than acroscopic ones, but proximal pair of pinnules slightly shortened sometimes, above ones lanceolate, 6-7 × ca. 2.5 cm, bases broadly cuneate, pinnatifid, apices caudate-acuminate; pinnules of 2-pinnate laminae ca. 10 pairs, proximal 2 or 3 pairs slightly shortened, narrowly oblong, 6-15 × 3-4 mm, bases adnate to costules, decurrent, connected to each other by narrow wings, margins lobed to 1/2 of distance to costule, apices rounded-obtuse or acute; segments 4 or 5 pairs, triangular, entire, obtuse-pointed at apices. Veins not evident, lateral veins usually forked, 2-6 pairs per ultimate pinnule or segment and not reaching margins. Laminae thinly herbaceous, when dry yellowish green, with sparse grayish white short hairs on both surfaces. Sori orbicular, 1-5 pairs per pinnule or segment, attached near ends of acroscopic vein of forked veins, slightly closer to margins; indusia small, orbicular-reniform, membranous, green, with short hairs, persistent.

● Shaded wet places in valley forests; 800-1500 m. Anhui, Fujian, NW Jiangxi, S Zhejiang.

Metathelypteris petiolulata is similar to M. hattorii but differs by its laminae broader, 3-pinnate to 3-pinnate-pinnatifid, proximal pinnae and pinnules of 1-pinnate laminae stalked, and apices of pinnules of 1-pinnate laminae caudate-acuminate.


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