biostudies-literatureUnknown241Wang T<i>Angiopterisnodosipetiolata</i> Ting Wang tris, H.F.Chen & Y.H.Yan, a new fern of Marattiaceae, is described and illustrated. Morphologically, <i>A.nodosipetiolata</i> is similar to <i>A.chingii</i> with more than one naked pulvinus on the stipe and numerous jointed hairs on the undersides of the mature pinnae. However, the pinnae of <i>A.nodosipetiolata</i> are lanceolate and can reach up to 4-6 pairs, whereas they are elliptic and occur in 2-3 pairs in <i>A.chingii</i>. Phylogenetic and genetic distance analysis, based on the plastid genomes, also indicates that <i>A.nodosipetiolata</i> is not closely related to <i>A.chingii</i>. Currently, there are ca. 500 mature individuals in Gulinqing Nature Reserve and we suggest <i>A.nodosipetiolata</i> should be categorised as an Endangered (ENPhytoKeys177-189https://www.ebi.ac.uk/biostudies/studies/S-EPMC11077261biostudies-literature<i>Angiopterisnodosipetiolata</i> (Marattiaceae), a new fern species from Yunnan, China.PMC11077261Yan YHZhang JGYao SWWang TChen HFYang TZhang GLXiang JYfalse<i>Angiopterisnodosipetiolata</i> (Marattiaceae), a new fern species from Yunnan, China.<i>Angiopterisnodosipetiolata</i> Ting Wang tris, H.F.Chen & Y.H.Yan, a new fern of Marattiaceae, is described and illustrated. Morphologically, <i>A.nodosipetiolata</i> is similar to <i>A.chingii</i> with more than one naked pulvinus on the stipe and numerous jointed hairs on the undersides of the mature pinnae. However, the pinnae of <i>A.nodosipetiolata</i> are lanceolate and can reach up to 4-6 pairs, whereas they are elliptic and occur in 2-3 pairs in <i>A.chingii</i>. Phylogenetic and genetic distance analysis, based on the plastid genomes, also indicates that <i>A.nodosipetiolata</i> is not closely related to <i>A.chingii</i>. Currently, there are ca. 500 mature individuals in Gulinqing Nature Reserve and we suggest <i>A.nodosipetiolata</i> should be categorised as an Endangered (EN2024-01-01T00:00:00Z20242026-04-16T03:19:20.952Z2026-04-16T03:11:24.564ZS-EPMC110772613872101110.3897/phytokeys.241.115175