![Transection of frond axis. A: V-shaped groove of Athyrium otophorum. ]3: V-shaped groove of Cornopteris opaca. C-E: U-shaped groove with a fiat base. C: JDiplazium mettenianum, D: D. squamigerum. E: D. mesosorum. F, G: U-shaped groove. F: D. wichurae, G: D. pin.faense. H: shallow groove of Deparia pycnosora. A: • 9; ]3-H: • 6.](https://www.researchgate.net/profile/Masahiro-Kato-6/publication/225667935/figure/fig2/AS:651187980353538@1532266721941/Transection-of-frond-axis-A-V-shaped-groove-of-Athyrium-otophorum-3-V-shaped-groove_Q320.jpg)
![Marginal cells of frond. A: linear cells of Athyrium niponicum. ]3-F: elliptic cells. ]3: A. atkinsoni, C: Diplazium squamigerum, D: D. mesosorum, E: Deparia pycnosora, F: Cornopteris opaca. G: linear cells of C. crenulatoserrulata. It: intermediate forms of C. hakonensis. • 100.](https://www.researchgate.net/profile/Masahiro-Kato-6/publication/225667935/figure/fig3/AS:651187980353539@1532266721977/Marginal-cells-of-frond-A-linear-cells-of-Athyrium-niponicum-3-F-elliptic-cells-3_Q320.jpg)
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Classification ofAthyrium and allied genera of Japan
Abstract and Figures
The classification ofAthyrium sensu lato is revised on the basis of evidence from anatomical and morphological observations. Although parallelism is found
in several characteristics, stipe base, groove of frond axis, laminar margin, venation, sorus and dermal appendage are important
to classify the genus and elucidate the relationship within it.Athyrium sensu lato is divided into four generaAthyrium, Cornopteris, Deparia andDiplazium, small genera being referred toAthyrium orDiplazium, Deparia is construed in a broad sense to includeAthyriopsis, Dryoathyrium andLunathyrium. The four genera with infrageneric groups or sections are described in detail. Among the genera,Athyrium, particularly theA. puncticaule group, may be considered to have primitive characteristics, andCornopteris may have been derived fromAthyrium by abortion of the indusia.Cystopteris is also related toAthyrium on the basis of reniform sori inC. douglasii.
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... Cornopteris Nakai is a small Asian (Himalayas, East and Southeast Asia) genus of terrestrial ferns that used to be recognized by many pteridologists (e.g., Nakai 1930;Ito 1939;Ching 1945;Holttum 1958;Tagawa 1959;Kato 1977Kato , 1979, on the basis of fleshy stipes, corniculate leaf axes, and exindusiate sori. ...
... Regarding its phylogenetic relationships, Ching (1945) regarded it to be "a little offshoot of the exindusiate Diplazium." Based on the presence of J-shaped sori in some species of Cornopteris, as well as on stipe features and spinulose midribs of the laminae, Kato (1977) concluded that Cornopteris was actually more closely related to Athyrium than to Diplazium. Serizawa (1981) agreed with Kato's conclusion and subsumed Cornopteris in Athyrium. ...
I describe Athyrium bipinnatum sp. nov. and discuss morphological differences between closely related species. The new species is endemic to Japan, occurring on the islands of Honshu, Kyushu, and Shikoku. Based on the criteria of the International union for conservation of nature and natural resources, this new species is here considered endangered.
... The genus is characterized by hair-like scales and disconnected grooves between rachises and costae (Kato 1973(Kato , 1977(Kato , 1984Rothfels et al. 2012;Sundue and Rothfels 2014;Kuo et al. 2018). These two features have not been observed in the genera Anisocampium C.Presl, Athyrium Roth., Diplazium Sw., Ephemeropteris R.C. Moran & Sundue, and Pseudathyrium Newman but in some species in the Athyriaceae family (Kato 1973;Rothfels et al. 2012;Moran et al. 2019). ...
I describe Deparia ×nanakuraensis hyb. nov. and discuss differences in morphological characteristics between parental species D. pterorachis and D. viridifrons with chromosome counting, plastid, and nuclear DNA markers. The new hybrid is endemic to the eastern and northern parts of Japan. Based on the criteria of the International Union for Conservation of Nature and Natural Resources, this new species is here considered Data Deficient. The ploidy level is diploid sterile.
... Rothfels et al. (2012) placed Diplazium in Athyriaceae Alston in the eupolypod II clade of ferns together with other genera such as Anisocampium, Athyrium, Deparia and Cornopteris. The word Diplazium is formed from the Greek word 'diplazios' indicating double sori covered by the indusium on both acroscopic and basiscopic sides of a vein, which is one of the characteristic of the genus (Kato 1977;Tryon & Tryon 1982;Kramer & Kato 1990;Maideen et al. 2018). There are 29 species of Diplazium enumerated in Peninsular Malaysia with six endemic species, D. angustipinna Holttum, Diplazium insigne Holttum, D. kunstleri Holttum, D. procumbens Holttum, D. velutinum Holttum and Diplazium sp. ...
Recent floristic sampling in Fraser’s Hill, Pahang, Malaysia resulted in recollection of a rare Diplazium species in Peninsular Malaysia, D. procumbens, a poorly known species which was first described by R.E. Holttum in 1940. In this paper, we provide comprehensive morphological and anatomical description of the species based on our thorough examination of specimens including the type, and designate a lectotype and isolectotype. We also studied the spore ornamentation of D. procumbens using scanning electron microscopy (SEM) and discovered that the spores have folds and non-fenestrate perine. Descriptions of the habitat and ecology are also presented.
... The lady ferns are a cosmopolitan clade of approximately 230 species (Rothfels & al., 2012;PPG I, 2016), most of which are Asian (Wei & al., 2018). They are characterized by terrestrial habit and usually elongate to linear sori that often curve distally over the vein to form rough C-or J-shapes (Ching, 1964;Kato, 1977;Sundue & Rothfels, 2014). Most recently, the lady ferns were analyzed phylogenetically by Wei & al. (2018), who provided a classification based upon their results. ...
This datasheet on Deparia petersenii subsp. petersenii covers Identity, Overview, Distribution, Dispersal, Hosts/Species Affected, Diagnosis, Biology & Ecology, Environmental Requirements, Impacts, Uses, Prevention/Control, Further Information.
The oldest fossils assigned to Athyrium (mostly based on the sorus morphology) comprise fronds and spores from the Lower Cretaceous of Northeast Asia. However, most molecular dating suggests that extant Athyrium diverged from its sister genus during the Eocene or later, implying that the Cretaceous fossils probably belong to another polypodiaceous taxon. By examining the sorus morphology of extant genera related to the family Athyriaceae, we found that the primary diagnostic feature for assigning the Cretaceous fossils to Athyrium, i.e., the sorus shape, is common to the entire extant family, or plesiomorphic for the genus. As the fronds are more commonly preserved than the reproductive parts, we compared the fossil frond morphology with those of living taxa of the family that is divided into two types. The Cretaceous fossil we examined here bears the frond’s costal groove characters on adaxial side, which is more closely related to that of the Deparia-clade instead of the clade including Athyrium and other genera of the family. The observation is further confirmed by the cladistic analysis using morphological characters. The systematic position of the Early Cretaceous “Athyrium” was resolved as a stem member of the total Athyriaceae using a tip-dating approach with the Fossilized Birth-Death model in a Bayesian framework. Our study suggests that Early Cretaceous fossils previously assigned to Athyrium require taxonomic revision.
Family- and genus-level circumscription of ferns in the suborder Aspleniineae (eupolypods II) has long been controversial, due in part to confusion about the relationship among the families Aspleniaceae and Athyriaceae. Recent studies have demonstrated that character states traditionally used to infer a close relationship between these two families are either symplesiomorphic or homoplastic, and re-examination of numerous taxa has led to the recircumscription of several clades, and the description of several new families and genera. In light of these findings, we re-evaluated the taxonomic affinities of Diplazium praestans, a little-known fern from western Amazonia that is morphologically disparate to the remainder of Neotropical Diplazium. Using sequence data from three chloroplast markers and analysis of eight morphological characters, we demonstrate that Diplazium praestans was erroneously placed in that genus and instead is a Hymenasplenium. We place it in a phylogenetic context, reassess its morphology in light of our findings, evaluate its conservation status under IUCN criteria, and provide a new combination: Hymenasplenium praestans. We also provide an updated key to the Neotropical species of Hymenasplenium and discuss unresolved taxonomic problems in the genus. © 2021 American Society of Plant Taxonomists Inc.. All rights reserved.
A new record of the fern genus Cornopteris Nakai from Peninsular Malaysia is presented. The species, C. opaca (D. Don) Tagawa was encountered during recent fieldwork in Mount Berinchang, Cameron Highlands. Previously, it has only been recorded from Mount Kinabalu in Sabah, East Malaysia. A description, photographs, and a distribution map of known occurences in Malaysia have been provided.
A taxonomic revision of Brazilian Diplazium recognized 28 species. The majority of these species are associated with preserved moist forest environments. The monographic study of Diplazium, as suggested by several authors over the last 30 years, has been difficult due to the large number of widely distributed taxa. Nine species are endemic to Brazil: Diplazium adnatum, D. brachycarpum, D. fimbriatum, D. leptochlamys, D. leptocarpon, D. longipes, D. mickelii, D. mutilum, D. tamandarei. We present an identification key for species with their descriptions, and illustrations. Twenty one lectotypes are also listed.