Cheng-wei Chen

A new vittarioid fern species, Haplopteris palustris , is here described from the swamp forests in western Malesia based on both morphological and molecular phylogenetic evidence. This species is unique among all recognized congeners with its strongly raised midrib on the adaxial lamina. Through phylogenetic analysis, it is resolved as the sister g...

Background This paper describes two datasets: species occurrences, which were determined by environmental DNA (eDNA) metabarcoding and their associated DNA sequences, originating from a research project which was carried out along the Houdong River (猴洞坑), Jiaoxi Township, Yilan, Taiwan. The Houdong River begins at an elevation of 860 m and flows fo...

In Indochina the species diversity of Cyatheaceae remains insufficiently known. Here we demonstrate the scaly tree fern Gymnosphaera salletii in Vietnam to be an assemblage of three distinct species based on molecular and morphological data, and report for the first time the occurrence of foliar nectaries in Gymnosphaera. The true G. salletii is mo...

Lycophytes are ancient vascular plants that are considered one of the oldest surviving lineages of vascular plants. The LYCOPHYTES of Sabah comprises 68 species and 3 infraspecific taxa belonging to 9 genera and 2 families. Out of these, 19 species are endemic to Borneo, and 3 species are endemic to Sabah. This poster is produced by Sabah Forest...

We reported nine fern species: Amblovenatum opulentum , Athyrium erythropodum , Haplopteris angustifolia , Hymenophyllum acanthoides , Hymenophyllum pachydermicum , Huperzia liangshanica , Microlepia smithii , Selaginella bisulcata , and Selaginella reticulata as indigenous to Vietnam based on our new collections and study of type materials and rel...

Premise: Detailed studies of the fungi associated with lycophytes and ferns provide crucial insights into the early evolution of land plants. However, most investigations to date have assessed fern-fungus interactions based only on visual root inspection. In the present research, we establish and evaluate a metabarcoding protocol to analyze the fu...

Scientific collection and documentation of ferns of Sarawak, Malaysia, began in the 19th century. The first and only enumeration of ferns in Sarawak was published by Parris and Latiff in 1997, presenting a provisional checklist for Malaysia, including Peninsular Malaysia, Sabah, and Sarawak. In this checklist, a total of 615 species of ferns and ly...

Situated in the southern end of the Annamite Mountain Range, Langbiang Plateau is a major biodiversity hotspot of southern Vietnam known for high species diversity and endemicity. To achieve effective conservation, parts of the plateau were designated as the Langbiang Biosphere Reserve, an UNESCO World Network aiming to improve relationships betwee...

Antrophyum is one of the largest genera of vittarioid ferns (Pteridaceae) and is most diverse in tropical Asia and the Pacific Islands, but also occurs in temperate Asia, Australia, tropical Africa and the Malagasy region. The only monographic study of Antrophyum was published more than a century ago and a modern assessment of its diversity is lack...

Ferns of Sabah. There are more than 830 species of ferns in Sabah. 73 species are endemic to Borneo and 66 endemic to Sabah, with 41 species confined to Mt. Kinabalu area. This is another biodiversity poster produced by the Sabah Forestry Department, prepared by Andi Maryani A.M. (FRC), with contribution from Cheng-Wei Chen (Academia Sinica, Taiwan...

Antrophyum kinabaluense, a rare fern from Kinabalu Park, Sahah, was described as new to science in early 2023 but very little is known about this species, including its phylogenetic relationship. In May, we made an expedition to Kinabalu Park to collect new specimens and then conducted a phylogenetic analysis based on four chloroplast loci. Antroph...

A revised checklist of 900 species and 26 infraspecific of ferns and lycophytes of Sabah is presented here. We classify these taxa into 39 families and 154 genera based on the updated classification. Out of these, 92 species are endemic to Borneo, and 69 species are endemic to Sabah, including 41 species are only confined to Mt. Kinabalu area. Comp...

During the past three decades, the field of plant taxonomy has made substantial progress due to the advancement of science and technology and as result, many taxonomic revisions have been carried out. Hence, it is important to update the taxonomic status of species with modern taxonomic findings. Accordingly, we have prepared this checklist of pter...

The Thelypteridaceae is the second most species-rich fern family in the Solomon Islands, representing 47 of the 449 ferns and lycophytes from the islands and a third of its endemic pteridophyte flora. Recently, there has been a major effort to document the botanical diversity of this tropical island archipelago, which has resulted in the discovery...

Pteris sect. Hypsopodium (Pteridaceae) was reported to contain about nine species. Here we describe two new species based on morphological and molecular evidence, namely Pteris faba Y.S.Chao sp. nov. from Papua New Guinea and the Philippines, and Pteris rubella Y.S.Chao & C.W.Chen sp. nov. from the Solomon Islands. We provide type information, vouc...

While the family Schizaeaceae (Schizaeales) represents only about 0.4% of the extant fern species diversity, it differs from other ferns greatly in gross morphologies, niche preferences, and life histories. One of the most notable features in this family is its mycoheterotrophic life style in the gametophytic stage, which appears to be associated w...

Amblovenatum immersum (Blume) Mazumdar (Thelypteridaceae) is newly recorded in Vietnam. It is similar to A. terminans (Panigrahi) J. P. Roux in its woody rhi-zome and cristate spores but differs in terms of its plant size, lobed pinnae, lobed segments, veinlets, sori and indusia. It was previously found to exist in China, India, Indonesia, Malay-si...

Recent molecular phylogenetic studies have identified four major clades within the fern genus Tectaria but none of them is supported by any morphological characters. Here we present an expanded phylogeny of Tectaria based on five plastid markers (atpB, ndhF 1 ndhF-trnN, rbcL, rps16-matK 1 matK, and trnL-F), with a particular focus on the species fr...

A checklist of all species of bryophytes, lycophytes, ferns, gymnosperms and angiosperms that are found in the wild (native, naturalised and casual) in Singapore is presented. We have attempted to account for all names of species and infraspecific taxa that have ever been recorded for Singapore, along with the pertinent publications that reported e...

We provide an annotated checklist of all known lycophytes and ferns in the Solomon Islands following an updated classification. It comprises two classes, 12 orders, 3 families, 122 genera, 449 species, and six infraspecific taxa, including 1 new species described here and 18 species newly recorded for the country. In addition, we make six new nomen...

A close relationship of the three Old World taenitidoid genera Austrogramme, Syngramma and Taenitis was traditionally suggested on the basis of morphology, and later gained further support from molecular phylogenetic analyses. However, due to insufficient sampling, the monophyly and intrageneric and interspecific relationships of these genera are s...

The generic classification of the Thelypteridaceae has been the subject of much controversy. Proposed taxonomic systems have varied from recognizing the approximately 1200 species in the family within the single genus Thelypteris, to systems favoring upwards of 30 genera. Insights on intrafamilial relationships, especially for neotropical taxa, hav...

A new species of Chingia, known only from Vanikoro in the Solomon Islands, is described and illustrated. It is distinctive in having flat, thickened, tortuous stipe scales. It is most closely related to an accession of Chingia clavipilosa from Mount Kinabalu, from which it is distinguished by its lack of hyaline acicular hairs on the abaxial lamina...

The genus Amblovenatum J.P. Roux is a small genus in the Thelypteridaceae. Previously, the genus Amblovenatum was named Amphineuron (Holttum, 1971). In 2007, David Middleton argued for the homonyms between the genus Ampineuron (Thelypteridaceae) and the genus Amphineurion (Apocynaceae). By 2009, the name Amblovenatum was used by J.P. Roux to replac...

The history of the study on pterido-flora in Vietnam is reviewed. Two new records, Adiantum capillus-junonis and Actinostachys wagneri are reported for Vietnam based on our new collections. A new species, Hymenophyllum bryoides , is described to accommodate its morphological and genetic distinctiveness from other congeneric species. Photographs of...

Two new fern species from Sarawak, Antrophyum hovenkampii and Pteris hovenkampii are described in memory of renownedpteridologist, Peter Hans Hovenkamp. Their relationships are inferred using morphological comparisons and molecular phylogenetic analyses. A description, photographs of key characters, distribution map, and habitat description of both...

Leucostegia has been long recognized as a small fern genus with only two species, L. immersa and L. pallida . Here we elevate a variety of L. immersa to species level and make the new combination Leucostegia amplissima based on morphological and molecular phylogenetic evidence. Morphologically, Leucostegia amplissima differs from L. immersa by havi...

Five new combinations are made in Haplopteris C.Presl (Pteridaceae: Vittarioideae), involving four transfers from Vittaria Sm. and one from Monogramma Comm. ex Schkuhr. Lectotypes are designated for V. pluridichotoma Bonap., V. schaeferi Hieron. and V. stenophylla Copel. Additionally, H. stenophylla (Copel.) C.W.Chen & S.Linds. is recognised as dis...

A new species, Asplenium alleniae , is described from high elevation habitats in Sabah (Malaysia) and Papua New Guinea. Previous phylogenetic analyses of chloroplast loci determined that A. alleniae was most closely related to A. pauperequitum from New Zealand. Asplenium alleniae differs from A. pauperequitum most obviously by the acuminate apices...

In the process of undertaking a comprehensive review of the pteridophytes of the Solomon Islands, multiple unidentified specimens of the fern genus Ptisana Murdock (Marattiaceae) were collected. Morphological and molecular phylogenetic analyses as well as field observations were required to identify the Solomon Islands taxa. Four species and one va...

Microsoroideae is the third largest of the six subfamilies of Polypodiaceae, containing over 180 species. These ferns are widely distributed in the tropical and subtropical regions of the Old World and Oceania. We documented the spore ornamentation and integrated these data into the latest phylogenetic hypotheses, including a sampling of 100 taxa r...

Pteris comans G.Forst. has been broadly circumscribed to encompass a variable assemblage of ferns throughout the Pacific and eastern Australia with anastomosing veins and large, dissected fronds. Populations from the tropical Pacific differ from populations in Australia and New Zealand in frond dissection and indumentum. DNA sequences for the chlor...

New Guinea is the world’s largest tropical island and has fascinated naturalists for centuries. Home to some of the best-preserved ecosystems on the planet and to intact ecological gradients—from mangroves to tropical alpine grasslands—that are unmatched in the Asia-Pacific region, it is a globally recognized centre of biological and cultural diver...

A new species, Antrophyum nambanense, is described here based on the evidence from morphology and molecular phylogeny. Morphologically, short taeniform soral paraphyses and large fronds are the diagnostic characteristics of A. nambanense. Phylogenetically, it is most closely related to A. annamense, but can be readily distinguished from A. annamens...

One genus (Chrysogrammitis) and twelve species (Asplenium pifongiae, Chrysogrammitis musgraviana, Crepidomanes makinoi, Ctenitis sinii, Ctenopterella khaoluangensis, Didymoglossum wallii, Dryopteris hendersonii, Hymenophyllum palmatifidum, H. paniculiflorum, Polystichum prionolepis, Pteris latipinna, and Stegnogramma wilfordii) of ferns are reporte...

Recent field expeditions in Langbiang Plateau of southern Vietnam resulted in new data for the orchid flora of Vietnam. Two new species (Nervilia pubilabia and Panisea sagittata), two new national records (Cheirostylis tortilacinia and Goodyera reticulata) and the rediscovery of a supposedly extinct species (Liparis nana) are reported, and backgrou...

We describe a new species of Stegnogramma (Thelypteridaceae; Polypodiales) as Stegnogramma australis. Morphologically, it is most similar to S. griffithii, sharing the character of pinnate fronds with ternate terminal pinnae. However, S. australis can be distinguished from S. griffithii by having more free pinna pairs, shorter distal stipe hairs, a...

Four new species of Hymenasplenium (Aspleniaceae) from Africa and Asia are here described based on both morphological and molecular evidence. These four new species include H. guineense and H. kenyense from mainland Africa and H. sabahense and H. wusugongii from Asia. These new species have been erroneously treated as H. unilaterale by earlier pter...

Ferns and lycophytes of Taiwan display an extraordinarily high diversity. Despite the detailed species documentation, the pteridophyte flora of Taiwan as a whole has never been organized into a phylogenetic framework. Here we provide an updated, phylogeny-based checklist that includes a total of 824 (infra)species taxa, of which eleven are first re...

Two poorly knownMalesian vittarioid ferns, Haplopteris angustissima and Monogramma capillaris, are noteworthy for their similar gross morphology. In this study, their systematic relationship was clarified by using molecular phylogenetic analysis which resolved the species in two different clades. Diagnostic morphological characters were further rev...

A new fern species from the Philippines, Haplopteris mindanaoensis S.Linds. & C.W.Chen, is described and illustrated based on the results of detailed morphological comparison and molecular phylogenetic analysis. Morphologically, Haplopteris mindanaoensis is characterised by having obovoid (rather than funnel-shaped) soral paraphyses and deep soral...

Abstract A new species was collected during a fern expedition in the Nuluhon Trusmadi Forest Reserve, Sabah, Borneo. Morphologically, it is similar to both Pteris decrescens Christ and P. parviloba Christ but can be distinguished by frond characters. Specifically, the new species differs from the other two species by having basiscopic secondary pin...

The fern genus Tectaria (Tectariaceae) is morphologically diverse and difficult in terms of recognizing species and species groups. To infer the systematic positions of some species and identity-unknown collections with special morphological characters, we conducted phylogenetic analyses based on sequences of five plastid regions (atpB, ndhF plus n...

The phylogenetic affinities of the fern genus Aenigmopteris have been the subject of considerable disagreement, but until now, no molecular data were available from the genus. Based on the analysis of three chloroplast DNA regions (rbcL, rps16-matK, and trnL-F) we demonstrate that Aenigmopteris dubia (the type species of the genus) and A. elegans a...

The Old World fern genus Pyrrosia (Polypodiaceae) offers a rare system in ferns to study morphological evolution because almost all species of this genus are well studied for their morphology, anatomy, and spore features, and various hypotheses have been proposed in terms of the phylogeny and evolution in this genus. However, the molecular phylogen...

A new combination, Pyrrosia annamensis (Christ) Li Bing Zhang, X.M.Zhou & C.W.Chen, for a Southeast Asian species formerly treated in Niphobolus is made. We also lectotypify Cyclophorus rhomboidalis Bonaparte.

The monotypic fern genus Dryopolystichum Copel. combines a unique assortment of characters that obscures its relationship to other ferns. Its thin-walled sporangium with a vertical and interrupted annulus, round sorus with peltate indusium, and petiole with several vascular bundles place it in suborder Poly-podiineae, but more precise placement has...

Figure S1. Maximum likelihood phylogram of Polypodiineae obtained from the combined (rbcL + rps4-trnS + trnL-F) dataset.

Figure S4. Maximum likelihood phylogram of Polypodiineae obtained from the trnL-F dataset.

Figure S2. Maximum likelihood phylogram of Polypodiineae obtained from the rbcL dataset.

Figure S3. Maximum likelihood phylogram of Polypodiineae obtained from the rps4-trnS dataset.

A systematic study of the vittarioid ferns of East Asia including China, Japan, Korea and Taiwan is presented based on an integrated analysis of morphology and molecular phylogeny. Several new taxonomic insights are derived from well-resolved phylogenetic trees and detailed morphological comparison. The morphological variation and molecular phyloge...

Independent gametophyte ferns are unique among vascular plants because they are sporophyteless and reproduce asexually to maintain their populations in the gametophyte generation. Such ferns had been primar- ily discovered in temperate zone, and usually hypothesized with (sub)tropical origins and subsequent extinction of sporophyte due to climate c...

Davalliaceae have been classified on the basis of morphological data or morphological and molecular data. The family has been divided into various genera, the circumscription of which may differ between authors. Previous phylogenetic analyses used limited numbers of genes and taxa. We studied the molecular phylogeny of the family by using two nucle...

Phylogeny has long informed pteridophyte classification. As our ability to infer evolutionary trees has improved, classifications aimed at recognizing natural groups have become increasingly predictive and stable. Here, we provide a modern, comprehensive classification for lycophytes and ferns, down to the genus level, utilizing a community-based a...

A preliminary checklist of ferns and lycophytes of Sabah were done by Said (2005), which reported 743 species of ferns and 61 species of lycophytes. Subsequently a number of papers have been published in which new taxa have been described or new records have been added to the ferns diversity of Sabah (Sugau, 2011; Andi et al., 2011; Parris et al.,...

Vittarioid ferns compose a well-supported clade of 100-130 species of highly simplified epiphytes in the family Pteridaceae. Generic circumscriptions within the vittarioid clade were among the first in ferns to be evaluated and revised based on molecular phylogenetic data. Initial analyses of rbcL sequences revealed strong geographic structure and...

Abstract— A vittarioid fern from the Solomon Islands, which has long been treated as Antrophyum semicostatum, is described here as a new species, Antrophyum solomonense . A description, illustration, and distribution of the new species are presented. Boot-shaped paraphysal apical cells, rounded stipe in cross section, and thin rhizome scale cell wa...

Three new species (Calymmodon concinnus, Oreogrammitis parvula, Xiphopterella parva), and seven new records (Dasy-grammitis brevivenosa, Oreogrammitis sinohirtella, Radiogrammitis beddomeana, R. jagoriana, Scleroglossum pyxidatum, S. sulcatum and Themelium halconense) of grammitid ferns (Polypodiaceae) are reported for the flora of Vietnam, mostly...

Davallia repens and its close relatives have been identified as a species complex in this study because of the existence of continuously morphological variation. To decipher its evolutionary history, integrated methodologies were applied in this study including morphology, cytology, reproductive biology and molecular phylogeny. Analysis of morpholo...

The occurrence and distribution of 3 poorly known fern species in Taiwan are confirmed herein. They are Crepidomanes grande (Copel.) Ebihara & K. Iwats. (an overlooked species), Radiogrammitis setigera (Blume) Parris (a rediscovered species), and Prosaptia nutans (Bl.) Mett. (a poorly known record in Taiwan). This paper provides morphological descr...

A new species of vittarioid ferns (Pteridaceae) that has long been regarded as Haplopteris amboinensis or H. forrestiana (a synonym of H. doniana), is described here as Haplopteris yakushimensis. Both macro-and micromorphological characteristics were compared with these two species. Chartaceous matured fronds, shallowly grooved adaxial costae and o...