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Polysiphonia Stricta
''Polysiphonia stricta'' is a small red marine alga in the Division Rhodophyta. ''Polysiphonia stricta'' forms dense clumps of branching axes. The plants grow to 25 cm high.''Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales.'' The Natural History Museum, London. Description ''P. stricta'' grows as small tufts of much branched tufts, growing to no more than 25 cm high. The axes are erect, ecorticate, with 4 periaxial cells growing from prostrate axes. All 4 of the periaxial cells are of the same length.Bunker, F.StP. D.,Brodie, J.A., Maggs, C.A. & Bunker, A.R. 2017. ''Seaweeds of Britain and Ireland.'' Second Edition. Wild Nature Press, Plymouth, UK. Reproduction Spermatangial branchlets are formed in clusters at the apices. Cystocarps are on wide stalks and are urceolate. The tetraspores are in series in the final branches. Habitat Epizoic and epiphytic in the low littoral to 20 m. Distribution Found around the British Isles The British ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conferva
''Cladophora'' is a genus of reticulated filamentous Ulvophyceae (green algae). The genus ''Cladophora'' contains many species that are very hard to tell apart and classify, mainly because of the great variation in their appearances, which is affected by habitat, age and environmental conditions. Unlike ''Spirogyra'' the filaments of ''Cladophora'' branch and do not undergo conjugation. There are two multicellular stages in its life cycle – a haploid gametophyte and a diploid sporophyte – which look highly similar. The only way to tell the two stages apart is to either count their chromosomes, or examine their offspring. The haploid gametophyte produces haploid gametes by mitosis and the diploid sporophyte produces haploid spores by meiosis. The only visible difference between the gametes and spores of ''Cladophora'' is that the gametes have two flagella and the spores have four. The ''Cladophora'' species can be a major nuisance causing major alteration to benthic conditio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ceramium
''Ceramium'' is a genus of Ceramium algae (or Rhodophyta). It is a large genus with at least 15 species in the British Isles.''Maggs, C.A. and Hommersand, M.H.'' 1993. ''Seaweeds of the British Isles. vol.1, Rhodophyta Part 3A Ceramiales.'' HMSO & Natural History Museum, London. The fully corticated group previously referred to as ''Ceramium rubrum'', an illegitimate name, is represented, in the British Isles by: '' Ceramium pallidum,'' ''Ceramium botryocarpum'', ''Ceramium nodulosum'' and ''Ceramium secundatum''.Morton, O. 1994. ''Marine Algae of Northern Ireland.'' Ulster Museum. Description All species of ''Ceramium'' are small algae growing to no more than 30 cm (12 in) in length. They consist of a terete monosiphonous axis of cells surrounded by smaller cells forming a cortex. In most species this a continuous cortex enclosing the axis, in others the cortical cells are arranged only in nodes at the junction of cells of the axes. The tips of the branches grow i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hutchinsia
''Noccaea'' is a problematic genus of flowering plants in the family Brassicaceae, native to temperate areas of western North America, southern South America, northern Africa, Europe and Asia. Species Currently accepted species include: *''Noccaea abchasica'' (F.K.Mey.) Al-Shehbaz *'' Noccaea aghrica'' (P.H.Davis & Kit Tan) Firat & Özüdogru *''Noccaea alpestris'' (Jacq.) Kerguélen *''Noccaea amani'' (Post) F.K.Mey. *''Noccaea andersonii'' (Hook.f. & Thomson) Al-Shehbaz *''Noccaea angustifolia'' F.K.Mey. *''Noccaea annua'' (K.Koch) F.K.Mey. *''Noccaea antitaurica'' (F.K.Mey.) Al-Shehbaz *''Noccaea apterocarpa'' (Rech.f. & Aellen) Al-Shehbaz & Menke *''Noccaea arctica'' (A.E.Porsild) Holub *''Noccaea atlantica'' (Batt.) Al-Shehbaz *''Noccaea banatica'' (R.Uechtr.) F.K.Mey. *''Noccaea bellidifolia'' (Griseb.) F.K.Mey. *''Noccaea birolmutlui'' Özgisi & Özüdogru *''Noccaea boeotica'' F.K.Mey. *'' Noccaea boissieri'' (Bornm.) D.A.German *''Noccaea borealis'' F.K.Mey. *''Noccaea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alga
Algae ( , ; : alga ) are any of a large and diverse group of photosynthetic, eukaryotic organisms. The name is an informal term for a polyphyletic grouping that includes species from multiple distinct clades. Included organisms range from unicellular microalgae, such as '' Chlorella'', '' Prototheca'' and the diatoms, to multicellular forms, such as the giant kelp, a large brown alga which may grow up to in length. Most are aquatic and lack many of the distinct cell and tissue types, such as stomata, xylem and phloem that are found in land plants. The largest and most complex marine algae are called seaweeds, while the most complex freshwater forms are the '' Charophyta'', a division of green algae which includes, for example, '' Spirogyra'' and stoneworts. Algae that are carried by water are plankton, specifically phytoplankton. Algae constitute a polyphyletic group since they do not include a common ancestor, and although their plastids seem to have a single or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhodophyta
Red algae, or Rhodophyta (, ; ), are one of the oldest groups of eukaryotic algae. The Rhodophyta also comprises one of the largest phyla of algae, containing over 7,000 currently recognized species with taxonomic revisions ongoing. The majority of species (6,793) are found in the Florideophyceae ( class), and mostly consist of multicellular, marine algae, including many notable seaweeds. Red algae are abundant in marine habitats but relatively rare in freshwaters. Approximately 5% of red algae species occur in freshwater environments, with greater concentrations found in warmer areas. Except for two coastal cave dwelling species in the asexual class Cyanidiophyceae, there are no terrestrial species, which may be due to an evolutionary bottleneck in which the last common ancestor lost about 25% of its core genes and much of its evolutionary plasticity. The red algae form a distinct group characterized by having eukaryotic cells without flagella and centrioles, chloroplasts th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ecorticate
A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.Introduction to Lichens – An Alliance between Kingdoms . University of California Museum of Paleontology. Lichens have properties different from those of their component organisms. They come in many colors, sizes, and forms and are sometimes plant-like, but are not s. They may have tiny, leafless branches (); flat leaf-like structures ( |
Periaxial
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Prostrate Shrub
A prostrate shrub is a woody plant, most of the branches of which lie upon or just above the ground, rather than being held erect as are the branches of most trees and shrubs. Background Prostration may occur because the supporting tissues in stems are not strong enough to support the weight of the plant, causing the plant to bend until it reaches the ground. Alternatively, it may occur because of a genetic disposition for branches to grow horizontally on or just under the ground; for example, as a strategy to avoid overly strong sunlight. Finally, environmental factors such as strong winds laden with sand or salt may tend to prune away erect branches, thereby creating a prostrate habit in plants that may not be predisposed to prostration. Ecology Prostrate shrubs are used in horticulture as groundcovers and in hanging baskets, and to bind soils and prevent erosion in remedial landscaping. They are also important components of rock gardens. The shrinking size of urban gardens ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spermatangia
A gametangium (plural: gametangia) is an organ or cell in which gametes are produced that is found in many multicellular protists, algae, fungi, and the gametophytes of plants. In contrast to gametogenesis in animals, a gametangium is a haploid structure and formation of gametes does not involve meiosis. Types of gametangia Depending on the type of gamete produced in a gametangium, several types can be distinguished. Female Female gametangia are most commonly called archegonia. They produce egg cells and are the sites for fertilization. Archegonia are common in algae and primitive plants as well as gymnosperms. In flowering plants, they are replaced by the embryo sac inside the ovule. Male The male gametangia are most commonly called antheridia. They produce sperm cells that they release for fertilization. Antheridia producing non-motile sperm (spermatia) are called spermatangia. Some antheridia do not release their sperm. For example, the oomycete antheridium ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cystocarp
A cystocarp is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in '' Polysiphonia)''. The structure from which carpospores are released.Maggs, C.A. and Hommersand, M.H. 1993. ''Seaweeds of the British Isles Volume 1 Rhodophyta Part 3A Ceramiales.'' The Natural History Museum, London References {{reflist Algal anatomy ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Urceolate
This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary of leaf morphology. For other related terms, see Glossary of phytopathology, Glossary of lichen terms, and List of Latin and Greek words commonly used in systematic names. A B ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetraspore
Tetraspores are red algae spores produced by the tetrasporophytic (diploid) phase in the life history of algae in the Rhodophyta as a result of meiosis.Jones, W.E. Revised and reprinted 1964. A Key to the genera of the British seaweeds.''Field Studies''. Vol 1 (4) pp.1 - 32 The name is derived from the 4 spores that form after this meiosis, the division is of three kinds: cruciate, zonate and tetrahedral In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all the .... References Red algae Reproduction {{rhodophyta-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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