identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
0916E64E3BE95122A608EA052CD2EBA9.text	0916E64E3BE95122A608EA052CD2EBA9.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Cyrtomium lacrimipinnum Yoneoka, T. Fujiw., V. S. Dang & Tagane 2026	<div><p>Cyrtomium lacrimipinnum Yoneoka, T. Fujiw., V. S. Dang &amp; Tagane, sp. nov.</p><p>Figs 1, 3</p><p>Diagnosis.</p><p>Cyrtomium lacrimipinnum is most similar to C. pachyphyllum in having oblong to triangular laminae with 1–5 pairs of lateral pinnae, deeply cordate pinna base, obscure venation with veinlets anastomosing to form 3–4 rows of areoles on each side of the midrib, areoles each containing 1–2 included veinlets, and dark brown stipe scales that are slightly twisted. However, it differs from C. pachyphyllum in having acute and attenuate pinnae apex (vs. obtuse), pinnae margins that are entire to undulate-serrate (vs. entire), and black or dark brown microscales on both surfaces of the pinnae (vs. only on abaxial surface). In addition, C. lacrimipinnum also resembles C. hemionitis in having deeply cordate pinnae base and broadly triangular terminal pinna, but distinguished by its 1–5 pairs of lateral pinnae (vs. usually simple frond or only with 1 pair in C. hemionitis) and the presence of black or dark brown microscales on both surfaces of the pinnae (vs. only on abaxial surface).</p><p>Type.</p><p>Vietnam • Quang Binh Province (currently Quang Tri Province): Phong Nha – Ke Bang National Park, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=106.22072&amp;materialsCitation.latitude=17.40343" title="Search Plazi for locations around (long 106.22072/lat 17.40343)">Bach Xanh Forest</a>, 17.40343, 106.22072, alt. 777 m, in shrubby forest on limestone ridge, 10 December 2024, Tagane S., Dang V. S., Souladeth P., Pham Q. T., Yamamoto T., Fujiwara T., Masuda R., Souvannakhoummane K., Phengmala K. N 1319 (holo-VNM [VNM 00073946]; iso-KAG [KAG 189432], MAK [MAK 483040]) .</p><p>Description.</p><p>Plants perennial, evergreen, 13–40 cm tall. Rhizomes erect, short, densely covered with scales. Scales lanceolate, up to 8.5 mm long, dark brown, slightly twisted, apex acuminate, margin irregularly serrate, base rounded. Stipes 7–25 cm long, 1.0–3.0 mm in diam., stramineous, scaly at the basal 1 / 4. Laminae imparipinnate, oblong or triangular, 5–15 × 5–11 cm, coriaceous, both surfaces bearing black or dark brown microscales, apex acute to acuminate; venation pinnate, obscure on both surfaces; veinlets anastomosing to form 3–4 rows of areoles on each side of midrib, each areole with 1–2 included veinlets. Terminal pinna triangular, 4.5–5.0 × 5.0–6.0 cm, base cordate, margin usually entire or sometimes undulate-serrate. Lateral pinnae 1–5 pairs, subopposite, ascending, shortly stalked, ovate, 3.0–9.0 × 2.0– 3.5 cm, base cordate, asymmetrical, apex acute or attenuate, margins entire to crenate-serrate; stalks 1.3–2.0 mm long, glabrous. Sori in 2–5 irregular rows along the margins on the abaxial surface of pinnae. Indusia 1.0– 1.2 mm in diam., dark reddish brown, margin weakly dentate. Spores ca. 64 per sporangium.</p><p>Etymology.</p><p>The specific epithet lacrimipinnum combines the Latin “ Lacrima, ” meaning “ tear, ” with pinna and refers to the teardrop-like outline of the lateral pinnae.</p><p>Distribution.</p><p>Vietnam (currently known from Phong Nha – Ke Bang National Park and adjacent limestone areas in Quang Tri Province).</p><p>Habitat.</p><p>Lithophytic on semi-shaded limestone outcrops and crevices, under shrubby moist forests on ridges.</p><p>Additional specimen examined.</p><p>Vietnam • Quang Tri Province: Phong Nha – Ke Bang National Park, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=106.2209&amp;materialsCitation.latitude=17.4039" title="Search Plazi for locations around (long 106.2209/lat 17.4039)">Bach Xanh Forest</a>, 17.4039°N, 106.2209°E, alt. 765 m, in scrubland on limestone rocks, 8 July 2025, Tagane S., Dang V. S., Souladeth P., Pham Q. T., Yamamoto T., Sengthong A., Tanaka N., Yoneoka K. N 1864 (VNM [VNM 00074914], KAG [KAG 189926]) . • Quang Binh Province (currently Quang Tri Province): Phong Nha – Ke Bang National Park, Tan Trach Commune, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=106.21889&amp;materialsCitation.latitude=17.406666" title="Search Plazi for locations around (long 106.21889/lat 17.406666)">Bo Trach District</a>, 17°24'24"N, 106°13'08"E, alt. ca 850 m, in a limestone area, presumed closed coniferous forest with Calocedrus rupestris, 37 km along Road No. 565, 13 December 2004, Wu S. K., Phan L. K., Gong X., Xiang J. Y., Nguyen V. T., Nguyen K. S. WP 1122 (MO [MO 04791545]) . • Quang Binh Province: Dalat Mountain, Moo Village, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=105.9228&amp;materialsCitation.latitude=17.6714" title="Search Plazi for locations around (long 105.9228/lat 17.6714)">Thuong Hoa Commune, Minh Hoa District</a>, 17.6714°N, 105.9228°E, alt. 550 m, 12 November 2014, Zhang L., Zhang L., Lu N. T. 7408 (MO [MO 6871989]) . • Quang Binh Province: limestone massif Ke Bang, vicinity of Yen Son Village, Thong Hoa Municipality, 72 km WNW of <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=105.95&amp;materialsCitation.latitude=17.666666" title="Search Plazi for locations around (long 105.95/lat 17.666666)">Dong Hoi</a>, 17°40'N, 105°57'E, alt. 500–600 m, 16 May 1997, L. Averyanov et al. VH 4658 (MO [MO 5176107]) . • Quang Bing Province: B ố Tr ạch, Tân Tr ạch, trail ca. 1 km north of Ch ốt Ki ểm Lâm 39, Limestone forest, 26 November 2025, Cheng-Wei Chen, Viet Dai Dang, Tich Dang, Shi-Yong Dong, Tian-Chuan Hsu, Chen Wade 7728 (SGN, TAIF) .</p><p>Notes.</p><p>Our herbarium survey of specimens of Cyrtomium from Vietnam, southern China, and adjacent areas revealed three additional MO specimens from the limestone region now included in Quang Tri Province, in addition to the population collected during our fieldwork. Among them, MO 6871989 differs from the holotype specimen in having undulate-serrate pinna margins. However, our field observations showed that such margins occasionally occur within populations of C. lacrimipinnum (Fig. 1 C), and we therefore regard this difference as falling within the range of phenotypic plasticity of the species. Despite extensive examination of specimens in VNM, HN, PE, and P, we found no additional material outside the limestone region now included in Quang Tri Province, nor from neighboring regions of Laos or southwestern China. Because more than 30 individuals were observed at the type locality, the species is likely to be more widespread along inaccessible and poorly collected limestone ridges.</p><p>The inferred sexual reproductive mode of the species is also noteworthy, because sexually reproducing species are considered to be rare in Cyrtomium, in which most members are thought to reproduce apogamously (Ootsuki et al. 2011; Liu et al. 2012). We attempted to determine its ploidy level by counting somatic chromosomes, but no suitable material for chromosome observation was obtained. Further cytological studies will therefore be necessary to clarify the biological characteristics of this species.</p></div>	https://treatment.plazi.org/id/0916E64E3BE95122A608EA052CD2EBA9	Public Domain	No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.		Pensoft via Plazi	Yoneoka, Katsuhiro;Fujiwara, Tao;Dang, Van-Son;Pham, Quoc Trong;Souladeth, Phetlasy;Sengthong, Anousone;Masuda, Riko;Yamamoto, Takenori;Tanaka, Nobuyuki;Tagane, Shuichiro	Yoneoka, Katsuhiro, Fujiwara, Tao, Dang, Van-Son, Pham, Quoc Trong, Souladeth, Phetlasy, Sengthong, Anousone, Masuda, Riko, Yamamoto, Takenori, Tanaka, Nobuyuki, Tagane, Shuichiro (2026): Cyrtomium lacrimipinnum (Dryopteridaceae), a new sexually reproducing fern from Phong Nha – Ke Bang National Park, Vietnam. PhytoKeys 275: 177-189, DOI: 10.3897/phytokeys.275.183837
