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Amorican Fern Journal 9G(;]):8()-82 (2006] A New Species of Microlepia (Dennstaedtiaceae) from Micangshan, China Mt. Guo and Xiao-si Bin Li A Herbarium, College of Litb Sc:ionco, Northwest & University, Yangling, Shaanxi 712100, China I'^ — A new Abstract. species. Microlepia nuccnv^sluuK^nsis [Dennstaedtiaceae], and descriljiul is illustratiul from the nortluirn slope of Mt. Micangslian in Hanzliong City of Sliaanxi Province, China. The gonus Microlepio [DGiinstaoclliaceae] consists of ca 70 species, mainly and with few distributed in tropical sul)tropical regions of Asia, a in Africa and Australia and one the Neotropics [Wu and Ching, Ching in 1991]. et aL (1959] recorded fifty-nine species of Microlepio from China, mainly from the Changjiang River area and from southern and southwestern China. Recently, during the course of examination of the fern specimens deposited WUK, new Microlepio micongshonensis, from Micangshan in a species, Mt. was discovered. Microlepio micangshanensis Guo nov. X. S. et B. Li, sp. Fig. 1. mm cm Herha 40-no Rhizoma perennis, planta tota alta. late repens, 3 crassum, griseo-brunneis dense obtectum; frondibus pilis distantihus. Stipes mm cm 15-25 Lamina longus, diametro, hrunneolus. bipinnata, lanceolata, 3 cm cm 25-40 longa, ca 10 lata, apice attcnuata; pinnis ca. 25-jugis, alternis, mm cm 1- 2-7 obliquis, petiolulatis (petiolulo ca 2 longo], lanceolatis, longis, cm 2 acuminatis, basi utrinque inaequaliter cuneatis, pinnatis; pinnulis latis, (segmentis) ultimis 7-8-iugis, ovatis vel oblongis, sessilibus, basali acroscopica mm mm majore, ad 15 longa, 10 pinnatifidis, obtusa, sequcntibus lata, ceteris minoribus, basiutrinque marginibus 3-4 inaequalter, cuneatis, acroscopicis marginibus lobato-iucisa, basiscopicis fere integris, apice dentatis; nervis in pinnulis pinnatis; nervulis iterum pinnatis vel furcatis simplicibusve, utrinque prominulis; obliquis, textura chartacea, colore in sicco flavescente viridi, paginis utrisque subglabris, costis aut nervis persparse strigosis exceptis; rachi rachillisque supra glabris, infra dense puberulis; soris parvis ad sinum loborum plerumque 1-5 positis pro segmento, indusiis semicupli- — formibus, pallide brunneis, dense longe TYPE. China, Shaanxi et strigosis. Hanzhong Province, City, Xiaonanhai, 600 m, 16 Mar. 1959, Pei-yuon Li alt. WUK]. 1060 Hanzhong, (holotype: China, Shaanxi, Xiaonanhai, 650 15 alt. in, WUK]. Mar. 1959, Pei-yuon 1044 (paratype: Li, mm cm 40—60 Rhizome Perennial herb, high. long-creeping, wide, clothed 3 mm cm with gray-brown 15-25 hairs. Stipes long, distant, wide, brownish. 3 GUO NEW FROM & A SPECIES OF MICROLEPJA CHINA 81 LI: Fig. 1. Holotype of Microlepia micangshanensis. A. Habit. B. IMnna. C. Ultimate segment showing and veins sori. AMERICAN VOLUME NUMBER FERN JOURNAL: 82 HG (2006) 3 cm cm Lamina 25-40 bipinnate, lanceolate, long, ca 10 wide, apex attenuate; mm pinnae ca 25 pairs, alternate, oblique, short-stalked [ca. 2 long], cm cm lanceolate, 2-7 long, 1-2 wide, apex acuminate, base cuneate, deeply pinnatifid; ultimate pinnules (segments) 7-8 ovate oblong, pairs, or sessile, mm mm basal acroscopic pinnule larger, usually parallel 15 long, 10 to racliis, wide, pinnatifid, apex obtuse or rounded, other pinnule smaller, about twice as long as wide, base cuneate, oblique, margins ^-4-incised on acroscopic side, nearly entire on basiscopic side, apex dentate; veins simple or forked, oblique, when visible on both surfaces; fronds chartaccous dry, dark green, strigose on vein of both surfaces; upper surface of rachis and rachillas glabrous, lower and brown surface of rachis rachillas densely bearing shout hairs; sori small, intramarginal, terminal on the veins, 1-5 on each segment; indusium half thin, cup-shaped, fixed by base and brownish, sides, strigose. known Microlepici micangshanensis grows on on rock and forest floor or is only from Hanzhong Shaanxi Hanzhong City of Province, China. City is middle located in the of the northern slope of Mt. Micangshan. new This species belongs to Microlepia based on the possession of intramarginal sori, terminal on the veins, cup-shaped indusia, attached at and and the base sides, basal acroscopic pinnules usually parallel rachis. to Microlepia micangshanensis very from known distinct other species of is and Microlepia easily recognized by having ca 25 pairs of deeply pinnatifid is pinnae. Microlepia micangshanensis most M. closely related sino-strigosa is to Ching but differs from the latter by deeply pinnatifid pinnae, sessile its pinnules, indusium shape (half cup-shaped versus reniform] and pinnule pairs (7-8 versus 12-20) AcKNOVVI.I'lJCMI'iNTS was This report suppurlod by Linds frtjin the N;ilinnal Natural Sc;iences Fnundatinn of C^hina No. 30370117, 30890400, 30409340) support (GraiiL aiitl llie spfuiial grants ft^om tho Cliinese We Acatl(^my of Sciojicos for Flora of (Uiina (KSXX-SW-122). also t^xpross onr dnej-i gratitudes for critioal reviews of the manuscript. Lttkrature Cri"L:n C and CiiiNG, R, S. X. Fn, C. H. VVanc; C;. X. Suing. 1959. Miorolepia. I'p. 211-245, in S. S. Cimkn and W. HeipuhUcae Y. Flora Popularfs Sinicae Science CiiiiN, i:ns. 3. Press, Beijing. C VVir, S. H. and R. Ching. 1901. Microlepia. Pp. 205-200, in Fern Families and Genera of China. Science Press, Beijing.