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Gymnocarpium X Intermedium
''Gymnocarpium'' is a small genus of ferns, called oak ferns. It was once placed with various other groups, including the dryopteroid ferns and the athyrioid ferns. Cladistic analysis has demonstrated that ''Gymnocarpium'' and ''Cystopteris ''Cystopteris'' is a genus of ferns in the family Cystopteridaceae. These are known generally as bladderferns or fragile ferns. They grow in temperate areas worldwide. This is a very diverse genus and within a species individuals can look quite ...'' form a natural but relatively primitive clade that is basal to the asplenioid, thelypterioid, and athyrioid ferns comprehensively. ''Gymnocarpium'' sori are small, round and naked. These ferns generally have a slender, creeping rhizome under the surface of the ground, and fairly thin-textured fronds. Phylogeny This genus includes the following species: References External links ''Gymnocarpium'' world species list Fern genera Taxa named by Edward Newman {{Polypodial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sorus
A sorus (: sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (: coenosori) is a compound sorus composed of multiple, fused sori. Etymology This Neo-Latin word is from Ancient Greek σωρός (''sōrós'' 'stack, pile, heap'). Structure In lichens and other fungi, the sorus is surrounded by an external layer. In some red algae, it may take the form of depression into the thallus. In ferns, the sori form a yellowish or brownish mass on the edge or underside of a fertile frond. In some species, they are protected during development by a scale or film of tissue called the indusium (: indusia), which forms an umbrella-like cover. Life cycle significance Sori occur on the sporophyte generation, the sporangia within producing haploid meiospores. As the sporangia mature, the indusium shrivels so that spore release is unimpeded. The sporangia then burst and release the spores. As an aid to identification The shape, arrang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocarpium
''Gymnocarpium'' is a small genus of ferns, called oak ferns. It was once placed with various other groups, including the dryopteroid ferns and the athyrioid ferns. Cladistic Cladistics ( ; from Ancient Greek 'branch') is an approach to biological classification in which organisms are categorized in groups ("clades") based on hypotheses of most recent common ancestry. The evidence for hypothesized relationships is ... analysis has demonstrated that ''Gymnocarpium'' and '' Cystopteris'' form a natural but relatively primitive clade that is basal to the asplenioid, thelypterioid, and athyrioid ferns comprehensively. ''Gymnocarpium'' sori are small, round and naked. These ferns generally have a slender, creeping rhizome under the surface of the ground, and fairly thin-textured fronds. Phylogeny This genus includes the following species: References External links ''Gymnocarpium'' world species list Fern genera Taxa named by Edward Newman {{Polypodia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocarpium Oyamense
''Gymnocarpium oyamense'' is a species of fern in the oak-fern genus ''Gymnocarpium'', family Aspleniaceae. It is found from Nepal to China and Japan and on to New Guinea. It has gained the Royal Horticultural Society's Award of Garden Merit The Award of Garden Merit (AGM) is a long-established award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions. It includes the full range of cultivated p ... as an ornamental. It grows in moist areas in forests and moss covered rocks. References oyamense Ferns of Asia Flora of Nepal Flora of East Himalaya Flora of Tibet Flora of North-Central China Flora of South-Central China Flora of Southeast China Flora of Taiwan Flora of Japan Flora of the Philippines Flora of the Maluku Islands Flora of New Guinea Plants described in 1933 {{Polypodiales-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocarpium Dryopteris
''Gymnocarpium dryopteris'', the western oakfern, common oak fern, oak fern, or northern oak fern, is a deciduous fern of the family Cystopteridaceae. It is widespread across much of North America and Eurasia. It has been found in Canada, the United States, Greenland, China, Japan, Korea, Russia, and most of Europe. It is a seedless, vascular plant (with xylem and phloem) that reproduces via spores (not seeds or flowers) and have a life cycle with alternating, free-living sporophyte and gametophyte phases. Description ''Gymnocarpium dryopteris'' has small, delicate fronds up to 40 cm (16 inches) long, with ternately-compound pinnae (leaves). Fronds occur singly. Each petiole grows from one node on a creeping rhizome. Fronds occur singly. On the underside of matured pinnae the naked sori can be found (the Latin generic name ''gymnocarpium'' means "with naked fruit"). The species grows in coniferous woodlands and on shale talus slopes. Despite its common name, ''Gymno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocarpium Disjunctum
''Gymnocarpium disjunctum'' is a species of fern in the family Cystopteridaceae, commonly known as Pacific oak fern, Hitchcock, C.L. and Cronquist, A. 2018. Flora of the Pacific Northwest, 2nd Edition, p. 58. University of Washington Press, Seattle. western oak fern, or Pacific oakfern. Description ''Gymnocarpium disjunctum'' is a medium green fern with delicate-looking leaves that grows from a long slender creeping rhizome. The leaves do not arise from a central point but rather grow up individually from the creeping rhizome, often forming a loose grouping on the forest floor. The petioles (stipes) are 1-3 mm in diameter and 12-44 cm long with sparse glandular hairs distally. The petiole and blade midribs are brownish green to black in color. The leaves are bright to medium green and are 20-68 cm in length, with a broadly deltate blade, and are 3-pinnate to pinnatifid. The abaxial (lower) leaf surface and rachis are glabrous (hairless) or with sparse glandular hairs, and the ada ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gymnocarpium Robertianum
''Gymnocarpium robertianum'', the limestone fern or scented oakfern, is a fern of the family Cystopteridaceae. Description ''Gymnocarpium robertianum'' has small (10–50 cm), deltate, two- to three-pinnate fronds. Fronds arise from creeping rhizomes and have long, delicate rachis. The sori are borne in round clumps on the underside of the blade and lack an indusium. This species differs from the closely related ''G. dryopteris'' in having a densely glandular rachis as well as a more sparsely glandular underside to the blade. ''Gymnocarpium robertianum'' is thought to hybridise with ''G. appalachianum'' giving rise to ''Gymnocarpium'' × ''heterosporum'' W. H. Wagner. This hybrid was only known from Pennsylvania where it has now been eradicated. The hybrid between ''G. robertianum'' and ''G. dryopteris'' is called ''Gymnocarpium'' × ''achriosporum'' Sarvela. This taxon is known from Sweden and Quebec. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GenBank
The GenBank sequence database is an open access, annotated collection of all publicly available nucleotide sequences and their protein translations. It is produced and maintained by the National Center for Biotechnology Information (NCBI; a part of the National Institutes of Health in the United States) as part of the International Nucleotide Sequence Database Collaboration (INSDC). In October 2024, GenBank contained 34 trillion base pairs from over 4.7 billion nucleotide sequences and more than 580,000 formally described species. The database started in 1982 by Walter Goad and Los Alamos National Laboratory. GenBank has become an important database for research in biological fields and has grown in recent years at an exponential rate by doubling roughly every 18 months. GenBank is built by direct submissions from individual laboratories, as well as from bulk submissions from large-scale sequencing centers. Submissions Only original sequences can be submitted to GenBank. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thelypteris
''Thelypteris'' (maiden ferns) is a genus of ferns in the subfamily Thelypteridoideae, family Thelypteridaceae, order Polypodiales. Two radically different circumscriptions of the genus are in use . In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the genus is a very small one with about two species. In other approaches, the genus is the only one in the subfamily Thelypteridoideae, and so includes between 875 and 1083 species. The genus name is from Greek ''thēlys'' "female" and ''pteris'' "fern". However, "female fern" usually refers to the common lady-fern. Taxonomy At one time, all thelypterioid ferns were included in the genus ''Dryopteris :''The moth genus ''Dryopteris'' is now considered a junior synonym of ''Oreta. ''Dryopteris'' , commonly called the wood ferns, male ferns (referring in particular to ''Dryopteris filix-mas''), or buckler ferns, is a fern genus in the family Dry ...'' because of the sorus shape. However, there are a great man ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), classification and a taxonomic rank of an organism, as well as a unit of biodiversity. Other ways of defining species include their karyotype, DNA sequence, morphology (biology), morphology, behaviour, or ecological niche. In addition, palaeontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. About 14% of these had been described by 2011. All species (except viruses) are given a binomial nomenclature, two-part name, a "binomen". The first part of a binomen is the name of a genus to which the species belongs. The second part is called the specific name (zoology), specific name or the specific ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asplenioideae
The Aspleniaceae (spleenworts) are a family of ferns, included in the order Polypodiales. The composition and classification of the family have been subject to considerable changes. In particular, there is a narrow circumscription, Aspleniaceae s.s. (adopted here), in which the family contains only two genera, and a very broad one, Aspleniaceae s.l., in which the family includes 10 other families kept separate in the narrow circumscription, with the Aspleniaceae s.s. being reduced to the subfamily Asplenioideae. The family has a worldwide distribution, with many species in both temperate and tropical areas. Elongated unpaired sori are an important characteristic of most members of the family. Description Members of the family grow from rhizomes, that are either creeping or somewhat erect, and are usually but not always unbranched, and have scales that usually have a lattice-like (clathrate) structure. In some species, for example ''Asplenium nidus'', the rhizomes form a kind ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cystopteris
''Cystopteris'' is a genus of ferns in the family Cystopteridaceae. These are known generally as bladderferns or fragile ferns. They grow in temperate areas worldwide. This is a very diverse genus and within a species individuals can look quite different, especially in harsh environments where stress stunts their growth. They hybridize easily with each other and identifying an individual can be challenging. In general these are rhizomatous perennials which grow in rocks or soil. Their leaves are multiply pinnate, in that each leaflet is divided into smaller parts. The sori are usually rounded and covered in an inflated bladder-like indusium. Phylogeny This genus includes the following species: Hybrids The hybrid species include: *'' C. fragilis'' (''C. "hemifragilis"'' × ''C. reevesiana''; allotetraploid) *'' C. laurentiana'' (''C. bulbifera'' × ''C. fragilis''; allohexaploid) *'' C. tennesseensis'' (''C. bulbifera'' × ''C. protrusa''; allotetraploid) *'' C. tenuis'' ('' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
