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Tetramyxa Marina
''Tetramyxa'' is a cercozoan protist, member of the plasmodiophores, parasite of several flowering plants. It was first described by Karl von Goebel in 1884, in his work ''Flora''. The genus is characterized by the appearance of resting spores (or cysts) in groups of four. Taxonomy There are two accepted species: *'' Tetramyxa parasitica'' (=''Thecaphora ruppiae'' ) – parasite of ''Zannichellia'', ''Potamogeton'' and ''Ruppia'' roots. *'' Tetramyxa marina'' – parasite of ''Halophila stipulacea'' petioles. The following additional species, though recognized as ''Tetramyxa'', are listed as doubtful in some sources: *'' Tetramyxa rhizophaga'' – parasite of ''Juniperus communis'' roots. *'' Tetramyxa triglochinis'' (=''Molliardia triglochinis'' ) – parasite of ''Triglochin maritimum'' stems, ovaries and stamens. *''Tetramyxa elaeagni'' – parasite of ''Elaeagnus multiflora ''Elaeagnus multiflora'', the cherry elaeagnus, cherry silverberry, goumi, gumi, or natsugumi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ruppia
''Ruppia'', also known as the widgeonweeds, ditch grasses or widgeon grass, is the only extant genus in the family Ruppiaceae, with eight known species. These are aquatic plants widespread over much of the world. The genus name honours Heinrich Bernhard Rupp, a German botanist (1688-1719). They are widespread outside of frigid zones and the tropics. Description The leaf is simple and not rhizomatous. They can be annual (commonly) or perennial (rarely); stem growth is conspicuously sympodial, but sometimes is not. These species are adapted to be in brackish water (and salt marshes). The leaves are small or medium-sized. Their disposition can be alternate, opposite, or whorled (usually alternate except when subtending an inflorescence). Even, lamina keep entire and are setaceous or linear. The leaf just shows one vein without cross-venules. Stomata are not present. The mesophyll leaks calcium oxalate crystals. The minor leaf veins do not present phloem transfer cells and leaks ves ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flowering Plant
Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants that produce their seeds enclosed within a fruit. They are by far the most diverse group of land plants with 64 orders, 416 families, approximately 13,000 known genera and 300,000 known species. Angiosperms were formerly called Magnoliophyta (). Like gymnosperms, angiosperms are seed-producing plants. They are distinguished from gymnosperms by characteristics including flowers, endosperm within their seeds, and the production of fruits that contain the seeds. The ancestors of flowering plants diverged from the common ancestor of all living gymnosperms before the end of the Carboniferous, over 300 million years ago. The closest fossil relatives of flowering plants are uncertain and contentious. The earliest angiosperm fossils ar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plasmodiophorid Genera
The Phytomyxea are a class of parasites that are cosmopolitan, obligate biotrophic protist parasites of plants, diatoms, oomycetes and brown algae. They are divided into the orders Plasmodiophorida (ICZN, or Plasmodiophoromycota, ICBN) and Phagomyxida. Plasmodiophorids are best known as pathogens or vectors for viruses of arable crops (e.g. club root in Brassicaceae, powdery scab in potatoes, and rhizomania in beets, especially sugar beets and some spinaches). Life cycle They typically develop within plant cells, causing the infected tissue to grow into a gall or scab. Important diseases caused by phytomyxeans include club root in cabbage and its relatives, and powdery scab in potatoes. These are caused by species of ''Plasmodiophora'' and ''Spongospora'', respectively.Agrios, George N. (2005). ''Plant Pathology''. 5th ed. Academic Presslink The vegetative form is a multinucleate cell, called a plasmodium. This ultimately divides to form new spores, which are released when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cercozoa Genera
Cercozoa is a phylum of diverse single-celled eukaryotes. They lack shared morphological characteristics at the microscopic level, and are instead defined by molecular phylogenies of rRNA and actin or polyubiquitin. They were the first major eukaryotic group to be recognized mainly through molecular phylogenies. They are the natural predators of many species of microbacteria and Archea. They are closely related to the phylum Retaria, comprising amoeboids that usually have complex shells, and together form a supergroup called Rhizaria. Characteristics The group includes most amoeboids and flagellates that feed by means of filose pseudopods. These may be restricted to part of the cell surface, but there is never a true cytostome or mouth as found in many other protozoa. They show a variety of forms and have proven difficult to define in terms of structural characteristics, although their unity is strongly supported by phylogenetic studies. Diversity Some cercozoans are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elaeagnus Multiflora
''Elaeagnus multiflora'', the cherry elaeagnus, cherry silverberry, goumi, gumi, or natsugumi, is a species of ''Elaeagnus'' native to China, Korea, and Japan. ''Elaeagnus multiflora'' is a deciduous or semi-evergreen shrub or small tree growing to tall, with a trunk up to diameter with dark brown bark. The shoots are densely covered in minute red-brown scales. The leaves are ovate to elliptic, long and broad, green above, and silvery to orange-brown below with dense small scales. The flowers are solitary or in pairs in the leaf axils, fragrant, with a four-lobed pale yellowish-white corolla long; flowering is in mid-spring. The fruit is a round to oval drupe long, silvery-scaled orange, ripening red dotted with silver or brown, pendulous on a peduncle. When ripe in mid- to late summer, the fruit is juicy and edible, with a sweet but astringent taste somewhat similar to that of rhubarb. The skin of the fruit is thin and fragile, making it difficult to transport, thus red ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Triglochin Maritimum
''Triglochin maritima'' is a species of flowering plant in the arrowgrass family Juncaginaceae. It is found in brackish marshes, freshwater marshes, wet sandy beaches, fens, damp grassland and bogs. It has a circumboreal distribution, occurring throughout the northern Northern Hemisphere. In the British Isles it is common on the coast, but very rare inland. Description It is similar to marsh arrowgrass (''Triglochin palustris'') but has the following differences: it has stolons, is stouter. The leaves are fleshy and not furrowed above. It is not very aromatic. The raceme are more dense and like sea plantain. The flowers are fleshier.C. Dwight Marsh, A. B. Clawson, and G. C. Roe Jr (1929). Arrow grass as a Stock-Poisoning Plant'' United States Department of Agriculture. The fruits are oval, 4 mm long, 2 mm wide. It varies in height from . It flowers in May to August; flowers are greenish, 3 petalled, edged with purple, across, in a long spike. Common names include se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Juniperus Communis
''Juniperus communis'', the common juniper, is a species of small tree or shrub in the cypress family Cupressaceae. An evergreen conifer, it has the largest geographical range of any woody plant, with a circumpolar distribution throughout the cool temperate Northern Hemisphere. Description ''Juniperus communis'' is very variable in form, ranging from —rarely —tall to a low, often prostrate spreading shrub in exposed locations. It has needle-like leaves in whorls of three; the leaves are green, with a single white stomatal band on the inner surface. It never attains the scale-like adult foliage of other members of the genus. It is dioecious, with male and female cones (both of which are wind pollinated) on separate plants. The male cones are yellow, long, and fall soon after shedding their pollen in March–April. The fruit are berry-like cones known as juniper berries. They are initially green, ripening in 18 months to purple-black with a blue waxy coating; they are spheri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Halophila Stipulacea
''Halophila stipulacea'' is a species of seagrass in the Hydrocharitaceae family. It is native to the Indian Ocean that spread into the Mediterranean Sea, Mediterranean after the opening of the Suez Canal. This seagrass is widespread through the Gulf of Aqaba. Recently it has arrived in the Caribbean where it is also spreading. It is suggested that the expansion of ''H. stipulacea'' from the Red Sea into the Mediterranean Sea was a result of the opening of the Suez Canal in 1869. The invasion into the Mediterranean was first documented in 1894. This species was first reported in the Caribbean in Grenada, Dominica, and St. Lucia in 2002, 2007, and 2008 respectively. By 2017, ''H. stipulacea'' had expanded to nineteen other Caribbean islands. In the United States Virgin Islands, ''H. stipulacea'' was first observed in 2012 along the northeast coast of St. John, followed by St. Thomas and St. Croix in 2013 and 2016 respectively. ''H. stipulacea'' has been classified as an invasive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Potamogeton
''Potamogeton'' is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed (''Elodea canadensis''). The genus name means "river neighbor", originating from the Greek ''potamos'' (river) and ''geiton'' (neighbor). Morphology ''Potamogeton'' species range from large (stems of 6 m or more) to very small (less than 10 cm). Height is strongly influenced by environmental conditions, particularly water depth. All species are technically perennial, but some species disintegrate in autumn to a large number of asexually produced resting buds called turions, which serve both as a means of overwintering and dispersal. Turions may be borne on the rhizome, on the stem, or on stolons from the rhizome. Most species, however, persist by perennial creeping rhizomes. In some cases the turions are the only means to differentiate species. The leav ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zannichellia
''Zannichellia'' (common name horned pondweed) is a genus of submerged aquatic flowering plant, with threadlike leaves and tiny flowers. It is fully adapted to an aquatic life cycle, including underwater pollination. There are perhaps five species, including ''Zannichellia palustris''. The genus is named after Gian Girolamo Zannichelli (1662–1729), Italian botanist. Description These slender plants grow submerged in water. The leaves are usually oppositely arranged and long and narrow. They have stipular sheaths. The flowers are unisexual. The male flowers have a single stamen with a slender filament and anthers that are 2-4- thecous. The female flowers have a cup-shaped membranous perianth. There are usually four carpels with a single pendulous ovule in each ovary. The stigma is shield shaped with toothed margins. The fruit is usually made of four long, dry achenes. The seeds are pendulous with a sub-cylindric embryo. The cotyledonous end is folded on itself twice. Di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parasite
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has characterised parasites as "predators that eat prey in units of less than one". Parasites include single-celled protozoans such as the agents of malaria, sleeping sickness, and amoebic dysentery; animals such as hookworms, lice, mosquitoes, and vampire bats; fungi such as Armillaria mellea, honey fungus and the agents of ringworm; and plants such as mistletoe, dodder, and the Orobanchaceae, broomrapes. There are six major parasitic Behavioral ecology#Evolutionarily stable strategy, strategies of exploitation of animal hosts, namely parasitic castration, directly transmitted parasitism (by contact), wikt:trophic, trophicallytransmitted parasitism (by being eaten), Disease vector, vector-transmitted parasitism, parasitoidism, and micropreda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Karl Ritter Von Goebel
Karl Immanuel Eberhard Ritter von Goebel FRS FRSE (8 March 1855, Billigheim, Baden – 9 October 1932, Munich) was a German botanist. His main fields of study were comparative functional anatomy, morphology, and the developmental physiology of plants under the influence of both phylogenetic and extrinsic factors. Life Starting in 1873, Goebel studied theology and philosophy, as well as botany with Wilhelm Hofmeister, at the University of Tuebingen. In 1876 he moved to Strasbourg, where he worked with Anton de Bary, and from which he graduated in 1877 with his Ph.D. In 1878, Goebel became assistant to Julius von Sachs, and in 1880 a lecturer at the University of Würzburg. In 1881 he became first assistant to August Schenk of the University of Leipzig, then an associate professor at Strasbourg, and 1882 associate professor at the University of Rostock, where in 1884 he founded the botanical garden and a botanical institute. From 1887–1891 he was a professor at Marburg, and from ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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