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1 9 4 4 广 西 植 物 44 卷
Vietnam is located in the east of Indochina lanceolateꎬ obliquely spreadingꎬ included angle with
Peninsulaꎬ bordering Guangxi and Yunnan of China to stem about 40°ꎬ length ̄width ratio about 5 ∶ 1ꎬ base
the northꎬ Laos and Cambodia to the west. Affected by cuneateꎬ sessileꎬ apex acuminateꎬ margin entire.
the tropical monsoon climateꎬ it has high annual rainfall Sporangium spikes terminalꎻ sporophylls ovate or ovate ̄
and humidityꎬ and is one of the 16 countries with high triangularꎬ acuminate or acute. Sporangia in axils of
biodiversity in the world. There are a total of 874 species sporophyllsꎬ reniformꎬ 2 ̄valvedꎬ yellow.
of lycopsids and ferns in 38 families and 116 genera Specimens examined: Lam Dong Prov.ꎬ Lac
(POWOꎬ 2024)ꎬ and there have been frequent reports of Duong Distr.ꎬ Da Chays Communeꎬ Hon
new species (Parris et al.ꎬ 2015ꎻ Pham et al.ꎬ 2022) and Ginomountainous rangeꎬ ca. 1 530 mꎬ epiphyte in
new recorded species (Wu et al.ꎬ 2005ꎬ 2006ꎬ 2012ꎻ evergreen seasonal tropical mixte broadꎬ 29 Oct. 2006ꎬ
Chen et al.ꎬ 2020ꎬ 2021ꎬ 2023ꎻ Wei et al.ꎬ 2022) in S. G. Wuet P. K. Loc etc. WP1194(KUN)ꎻ Lam Dong
recent years. While examining photographs and specimens Prov.ꎬ Lac Duong Distr.ꎬ Da Chays Communeꎬ BiDoup
of lycopsids and ferns collected in northern Vietnamꎬ the mountainous rangeꎬ around pointꎬ ca. 1 900 - 2 000 mꎬ
authors identified two species ( Adiantum longzhouensis epiphyte in evergreen seasonal tropical broad ̄leavedꎬ 31
and Lepisorus bicolor ) as newly recorded species in Oct. 2006ꎬ S. G. Wuet P. K. Loc etc. WP1264(KUN)ꎻ
Vietnam ( Wang et al.ꎬ 2017 ). Through consulting Lam Dong Prov.ꎬ Lac Duong Distr.ꎬ Cong Troi
relevant materials and specimensꎬ it was found that FPStationꎬ around pointꎬ ca. 1 680 -1 760 mꎬ epiphyte
Adiantum longzhouensis had been collected in Vietnam in evergreen seasonal tropical broad ̄leavedꎬ 7 Nov.
before (Wei et al.ꎬ 2022)ꎬ the reported A. juxtapositum 2006ꎬ S. G. Wuet P. K. Loc etc. WP1443(KUN).
Ching should be the misidentification of A. Distribution: Type specimens were collected from
longzhouensis. Phlegmariurus guangdongensis was also a Guangdong and distributed in Guangxiꎬ Guangdong and
newly recorded species from Vietnam(Wu et al.ꎬ 2013ꎻ Hainan of China. Epiphytic on tree trunks or rock
Nong et al.ꎬ 2016). It is now reported together to increase walls. Newly recorded species for Vietnam.
the biodiversity inventory of Vietnam. The voucher Notes: P. guangdongensis is similar to P. fordii
specimens were kept in the Herbarium of Kunming and P. henryiꎬ difference is that the sporophylls and
Institute of Botanyꎬ Chinese Academy of Sciences trophophylls distinctly dimorphic and the middle
(KUN)ꎬ Herbarium of Institute of Botanyꎬ Chinese trophophylls are sessile. It is also similar to P.
Academy of Sciences (PE) and Herbarium of Guangxi phlegmariaꎬ except that the stems of P. guangdongensis
Forestry Research Institute (GXFI). are 1 to 2 dichotomous branchesꎬ the plants are nearly
Phlegmariurus guangdongensis Ching in Acta erect or inclinedꎬ and the trophophylls are lanceolate or
Bot. Yunnan. 4 (2): 123. 1982ꎻ Li Bing Zhang et elliptical lanceolateꎬ with a length ̄width ratio less than
H. S. Kung in Acta Phytotax. Sin. 38 (1): 28. 2000ꎬ et 7 ∶ 1.
in Fl. Reipubl. Popularis Sin. 6(3): 35. 2004ꎻ Li Bing Adiantum longzhouensis A. H. Wangꎬ F. G.
Zhang et Kunio Iwatsuki in Flora of China Vol. 2 – 3: Wang & F. W. Xing in PLoS ONE 12(4): e0172729
22. 2013. ——— Huperzia guangdongensis ( Ching ) (14). 2017. 龙州铁线蕨 (Fig. 1: D-F)
Holub in Folia Geobot. Phytotax. 20: 73. 1985. 广东马 Type: China. Guangxiꎬ Daxin Countyꎬ Baoxu
尾杉 (Fig. 1: A-C) Townꎬ Jing ̄Yang ̄Cun Primary Schoolꎬ 10 Jun. 2014ꎬ
Type: China. Guangdongꎬ Xinyiꎬ 14 Apr. 1931ꎬ WAH017 (Holotype: IBSC!ꎻ Isotype: IBSC!).
S. P. Ko 51291 ( Holotype: PE!ꎻ Isotypes: PE!ꎬ Plants epilithicꎬ about 14 cm tall. Rhizomes shortꎬ
IBK!ꎬ SZ!). erectꎬ covered with lanceolate and black brown scalesꎬ
Epiphytic on rocks under forests. Stems caespitoseꎬ scales margin entire. Leaves clusteredꎬ about 5-11 cm
1- 3 ̄forked. Leaves spirally arrangedꎬ sporophylls and longꎬ about 1 mm thickꎬ glossy and smooth. Lamina 1 ̄
trophophylls distinctly dimorphic. Trophophylls elliptic ̄ pinnateꎬ odd ̄pinnate or paripinnateꎬ pinnae 9 - 14ꎬ