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Alsophila Doctersii
''Alsophila doctersii'', synonym ''Cyathea doctersii'', is a species of tree fern endemic to Sumatra, where it grows in forest at an altitude of approximately 150 m. The trunk is erect and 2–3 m tall. Fronds are bi- or tripinnate and 2–3 m long. The stipe is covered with scattered flat, brown scales and some hairs. Sori occur near the fertile pinnule midvein and are covered by thin, brown indusia that are scale-like in appearance. ''A. doctersii'' appears to be most closely related to ''Alsophila javanica''. Large and Braggins (2004) note that it may in fact be of hybrid origin between ''A. javanica'' and a member of the ''Alsophila latebrosa'' complex. The specific epithet ''doctersii'' commemorates botanist Willem Marius Docters van Leeuwen (1880-1960), who collected numerous plant species in Asia Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinnule
A leaflet (occasionally called foliole) in botany is a leaf-like part of a compound leaf. Though it resembles an entire leaf, a leaflet is not borne on a main plant stem or branch, as a leaf is, but rather on a petiole or a branch of the leaf. Compound leaves are common in many plant families and they differ widely in morphology. The two main classes of compound leaf morphology are palmate and pinnate. For example, a ''hemp'' plant has palmate compound leaves, whereas some species of ''Acacia'' have pinnate leaves. The ultimate free division (or leaflet) of a compound leaf, or a pinnate subdivision of a multipinnate leaf is called a pinnule or pinnula. Image:Ветвь акации.jpg, Pinnate leaf of a legume with 10 leaflets Image:Mimosa Pudica.gif, ''Mimosa pudica'' folding leaflets inward. See also * Compound leaf A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosyn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alsophila (plant)
''Alsophila'' is a genus of tree ferns in the family Cyatheaceae. It has also been considered to be a section in the subgenus ''Cyathea'' of the genus ''Cyathea''. Description Species of ''Alsophila'' have a treelike growth habit, with an erect trunk that rarely branches, or sometimes a more shrublike habit, with a creeping stem. Their fronds are large, with a strawlike stalk (stipe), dark brown or black in colour. Brown or dark brown scales are present, with distinct margins. The blade (lamina) of the frond is divided one to three times (one- to three-pinnate). The sori (spore-producing structures) are rounded and borne on smaller veins on the lower surface of the frond. An indusium (a covering to the sori) may or may not be present; if present initially, it may be lost as the frond ages. ''Alsophila'' is now separated from the other genera in the family Cyatheaceae primarily on the basis of molecular phylogenetic studies. The scales on the stalks (petioles) provide a morphol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asia
Asia (, ) is one of the world's most notable geographical regions, which is either considered a continent in its own right or a subcontinent of Eurasia, which shares the continental landmass of Afro-Eurasia with Africa. Asia covers an area of , about 30% of Earth's total land area and 8.7% of Earth's total surface area. The continent, which has long been home to the majority of the human population, was the site of many of the first civilizations. Its 4.7 billion people constitute roughly 60% of the world's population. In general terms, Asia is bounded on the east by the Pacific Ocean, on the south by the Indian Ocean, and on the north by the Arctic Ocean. The border of Asia with Europe is a historical and cultural construct, as there is no clear physical and geographical separation between them. It is somewhat arbitrary and has moved since its first conception in classical antiquity. The division of Eurasia into two continents reflects East–West cultural, linguistic, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Willem Marius Docters Van Leeuwen
Willem Marius Docters van Leeuwen (16 March 1880 - 25 February 1960) was a Dutch botanist and entomologist who worked in the Dutch colony in Indonesia, where he was prominent for conducting studies on insect-plant interactions as well as for his long-term studies on the island of Krakatoa. Van Leeuwen was born in Batavia, Indonesia and was educated at the University of Amsterdam. He graduated in 1905 and received a PhD in 1907. He went to Salatiga, Central Java as an entomologist in 1908 and was also a school teacher in Semarang and later Bandung. He studied galls, ant-plant symbioses, pollination biology, montane flora and floral succession on the islands of Krakatau over the course of a long period. In 1918 he became director of the Buitenzorg Bogor ( su, , nl, Buitenzorg) is a city in the West Java province, Indonesia. Located around south of the national capital of Jakarta, Bogor is the 6th largest city in the Jakarta metropolitan area and the 14th overall nationwide. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Epithet
An epithet (, ), also byname, is a descriptive term (word or phrase) known for accompanying or occurring in place of a name and having entered common usage. It has various shades of meaning when applied to seemingly real or fictitious people, divinities, objects, and binomial nomenclature. It can also be a descriptive title: for example, Pallas Athena, Phoebus Apollo, Alfred the Great, Suleiman the Magnificent, and Władysław I the Elbow-high. Many English monarchs have traditional epithets: some of the best known are Edward the Confessor, William the Conqueror, Richard the Lionheart, Æthelred the Unready, John Lackland and Bloody Mary. The word ''epithet'' can also refer to an abusive, defamatory, or derogatory phrase. This use as a euphemism is criticized by Martin Manser and other proponents of linguistic prescription. H. W. Fowler complained that "epithet is suffering a vulgarization that is giving it an abusive imputation." Linguistics Epithets are sometimes at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alsophila Latebrosa
''Alsophila latebrosa'', synonym ''Cyathea latebrosa'', is a common and widespread species of tree fern native to Indochina. Its natural range covers Cambodia and Thailand, and stretches from the Malay Peninsula to Indonesia, where it is present on the islands of Borneo and Sumatra. Plants reported from India and Sri Lanka have thinner indusia and may represent a separate, as-yet undescribed, species. ''A. latebrosa'' grows in a wide range of habitats, including forest, secondary forest, and plantations, from sea level up to an elevation of about 1500 m. Description The trunk of ''Alsophila latebrosa'' is erect and usually grows to a height of 3–4 m. Fronds may be bi- or tripinnate and are about 2 m long. They are lighter in colouration underneath and form a sparse, feathery crown. The stipe is reddish-brown, spiny, and bears some scales near the base. These scales are dark, glossy, and have fragile edges. Stipes may be retained in younger plants, forming a characteristic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hybrid (biology)
In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different breeds, varieties, species or genera through sexual reproduction. Hybrids are not always intermediates between their parents (such as in blending inheritance), but can show hybrid vigor, sometimes growing larger or taller than either parent. The concept of a hybrid is interpreted differently in animal and plant breeding, where there is interest in the individual parentage. In genetics, attention is focused on the numbers of chromosomes. In taxonomy, a key question is how closely related the parent species are. Species are reproductively isolated by strong barriers to hybridisation, which include genetic and morphological differences, differing times of fertility, mating behaviors and cues, and physiological rejection of sperm cells or the developing embryo. Some act before fertilization and others after it. Similar barriers exist in plants, with differences in flowering tim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alsophila Javanica
''Alsophila javanica'', synonym ''Cyathea javanica'', is a species of tree fern native to western Java and Sumatra, in Indonesia. It grows in rain forest and on riverbanks at an altitude of 250–1500 m. Description The trunk of ''Alsophila javanica'' is erect and up to about 10 m tall. Fronds may be bi- or tripinnate and 2–3 m in length. The stipe is spiny and bears scattered scales throughout. These scales are dark and have fragile edges. ''A. javanica'' has round sori which are borne near the midvein of fertile pinnules. They are protected by firm, flat indusia that are saucer-like in appearance. Taxonomy ''Alsophila javanica'' appears to be most closely related to '' Alsophila doctersii''. Large and Braggins (2004) note that ''A. doctersii'' may in fact be of hybrid origin between ''A. javanica'' and a member of the ''Alsophila latebrosa'' complex. When Carl Blume described ''A. javanica'' (as ''Cyathea javanica''), he also named one variety, ''rigid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Indusium
A sorus (pl. sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (plural coenosori) is a compound sorus composed of multiple, fused sori. Etymology This New 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, which forms an umbrella-like cover. Lifecycle significance Sori occur on the sporophyte generation, the sporangia within producing haploid meio spores. 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, arran ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sorus
A sorus (pl. sori) is a cluster of sporangia (structures producing and containing spores) in ferns and fungi. A coenosorus (plural coenosori) is a compound sorus composed of multiple, fused sori. Etymology This New 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, which forms an umbrella-like cover. Lifecycle 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, arrangemen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synonym (taxonomy)
The Botanical and Zoological Codes of nomenclature treat the concept of synonymy differently. * In botanical nomenclature, a synonym is a scientific name that applies to a taxon that (now) goes by a different scientific name. For example, Linnaeus was the first to give a scientific name (under the currently used system of scientific nomenclature) to the Norway spruce, which he called ''Pinus abies''. This name is no longer in use, so it is now a synonym of the current scientific name, ''Picea abies''. * In zoology, moving a species from one genus to another results in a different binomen, but the name is considered an alternative combination rather than a synonym. The concept of synonymy in zoology is reserved for two names at the same rank that refers to a taxon at that rank - for example, the name ''Papilio prorsa'' Linnaeus, 1758 is a junior synonym of ''Papilio levana'' Linnaeus, 1758, being names for different seasonal forms of the species now referred to as ''Araschnia le ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
