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Plocamium Cartilagineum
''Plocamium cartilagineum'' is a medium-sized red marine alga. Description ''Plocamium cartilagineum'' is an erect red alga growing to 10 cm in length. The main axes is flattened with regular flattened branches on both sides. The branches are long and short alternately, the short ones on one side are opposite the longer on the other side. These longer branches bear two or three short curved branches in series, comb-like. The plants are fully corticated. This branching pattern is similar to '' Plocamium lyngyanum'' and ''Plocamium maggsiae'' the other European species which have only recently been distinguished.Bunker, F.StP.D., Brodie, J.A., Maggs, C.A. and Bunker, A.R. 2017 ''Seaweeds of Britain and Ireland''. Second Edition. Wild Nature Press, Plymouth, UK Habitat Common on rock in the lower littoral and deeper to 30.Hardy, F.G. and Guiry, M.D. 2003 ''A Check-list and Atlas of Seaweeds of Britain and Ireland.'' The British Phycological Society Reproduction The plant ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plocamium Cartilagineum Miller
''Plocamium'' is a genus of red algae in the family Plocamiaceae. It contains around 40 species and has a cosmopolitan distribution in temperate seas, although it is most diverse in the southern hemisphere. ''Plocamium'' has erect elliptical thalli that grow up to in length. They are bright red in color with strongly flattened delicately branching fronds that further divide into two to five smaller branchlets. Species classified under the genus include the following: ;Accepted species: *'' Plocamium affine'' Kützing, 1849 *'' Plocamium angustum'' (J.Agardh) J.D.Hooker & Harvey, 1847 *'' Plocamium beckeri'' F.Schmitz ex Simons, 1964 *'' Plocamium brachiocarpum'' Kützing, 1849 *''Plocamium brasiliense'' (Greville) M.A.Howe & W.R.Taylor, 1931 *''Plocamium cartilagineum'' (Linnaeus) P.S.Dixon, 1967 *'' Plocamium cirrhosum'' (Turner) M.J.Wynne, 2002 *''Plocamium corallorhiza'' (Turner) J.D.Hooker & Harvey, 1845 *'' Plocamium cornutum'' (Turner) Harvey, 1849 *''Plocamium cruc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Red Alga
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 (biology), class), and mostly consist of multicellular, ocean, marine algae, including many notable seaweed, 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corticated
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Plocamium Lyngyanum
''Plocamium'' is a genus of red algae in the family Plocamiaceae. It contains around 40 species and has a cosmopolitan distribution in temperate seas, although it is most diverse in the southern hemisphere. ''Plocamium'' has erect elliptical thalli that grow up to in length. They are bright red in color with strongly flattened delicately branching fronds that further divide into two to five smaller branchlets. Species classified under the genus include the following: ;Accepted species: *'' Plocamium affine'' Kützing, 1849 *'' Plocamium angustum'' (J.Agardh) J.D.Hooker & Harvey, 1847 *'' Plocamium beckeri'' F.Schmitz ex Simons, 1964 *'' Plocamium brachiocarpum'' Kützing, 1849 *''Plocamium brasiliense'' (Greville) M.A.Howe & W.R.Taylor, 1931 *''Plocamium cartilagineum'' (Linnaeus) P.S.Dixon, 1967 *'' Plocamium cirrhosum'' (Turner) M.J.Wynne, 2002 *''Plocamium corallorhiza'' (Turner) J.D.Hooker & Harvey, 1845 *'' Plocamium cornutum'' (Turner) Harvey, 1849 *''Plocamium cruc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plocamium Maggsiae
''Plocamium'' is a genus of red algae in the family Plocamiaceae. It contains around 40 species and has a cosmopolitan distribution in temperate seas, although it is most diverse in the southern hemisphere. ''Plocamium'' has erect elliptical thalli that grow up to in length. They are bright red in color with strongly flattened delicately branching fronds that further divide into two to five smaller branchlets. Species classified under the genus include the following: ;Accepted species: *'' Plocamium affine'' Kützing, 1849 *'' Plocamium angustum'' (J.Agardh) J.D.Hooker & Harvey, 1847 *'' Plocamium beckeri'' F.Schmitz ex Simons, 1964 *'' Plocamium brachiocarpum'' Kützing, 1849 *'' Plocamium brasiliense'' (Greville) M.A.Howe & W.R.Taylor, 1931 *'' Plocamium cartilagineum'' (Linnaeus) P.S.Dixon, 1967 *'' Plocamium cirrhosum'' (Turner) M.J.Wynne, 2002 *''Plocamium corallorhiza'' (Turner) J.D.Hooker & Harvey, 1845 *'' Plocamium cornutum'' (Turner) Harvey, 1849 *'' Plocamium c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Littoral
The littoral zone or nearshore is the part of a sea, lake, or river that is close to the shore. In coastal ecology, the littoral zone includes the intertidal zone extending from the high water mark (which is rarely inundated), to coastal areas that are permanently underwater, submerged — known as the ''foreshore'' — and the terms are often used interchangeably. However, the geographical meaning of ''littoral zone'' extends well beyond the intertidal zone to include all neritic waters within the bounds of continental shelves. Etymology The word ''littoral'' may be used both as a noun and as an adjective. It derives from the Latin language, Latin noun ''litus, litoris'', meaning "shore". (The doubled ''t'' is a late-medieval innovation, and the word is sometimes seen in the more classical-looking spelling ''litoral''.) Description The term has no single definition. What is regarded as the full extent of the littoral zone, and the way the littoral zone is divided into subregi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plocamium Cartilagineum Cystocarps
''Plocamium'' is a genus of red algae in the family Plocamiaceae. It contains around 40 species and has a cosmopolitan distribution in temperate seas, although it is most diverse in the southern hemisphere. ''Plocamium'' has erect elliptical thalli that grow up to in length. They are bright red in color with strongly flattened delicately branching fronds that further divide into two to five smaller branchlets. Species classified under the genus include the following: ;Accepted species: *'' Plocamium affine'' Kützing, 1849 *'' Plocamium angustum'' (J.Agardh) J.D.Hooker & Harvey, 1847 *'' Plocamium beckeri'' F.Schmitz ex Simons, 1964 *'' Plocamium brachiocarpum'' Kützing, 1849 *''Plocamium brasiliense'' (Greville) M.A.Howe & W.R.Taylor, 1931 *''Plocamium cartilagineum'' (Linnaeus) P.S.Dixon, 1967 *'' Plocamium cirrhosum'' (Turner) M.J.Wynne, 2002 *''Plocamium corallorhiza'' (Turner) J.D.Hooker & Harvey, 1845 *'' Plocamium cornutum'' (Turner) Harvey, 1849 *''Plocamium cruc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dioecious
Dioecy (; ; adj. dioecious , ) is a characteristic of a species, meaning that it has distinct individual organisms (unisexual) that produce male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is biparental reproduction. Dioecy has costs, since only about half the population directly produces offspring. It is one method for excluding self-fertilization and promoting allogamy (outcrossing), and thus tends to reduce the expression of recessive deleterious mutations present in a population. Plants have several other methods of preventing self-fertilization including, for example, dichogamy, herkogamy, and self-incompatibility. Dioecy is a dimorphic sexual system, alongside gynodioecy and androdioecy. In zoology In zoology, dioecious species may be opposed to hermaphroditic species, meaning that an individual is either male or female, in which case the synonym gonochory is more often used. Most animal species are dioecious (gon ... [...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 carpospore A carpospore is a diploid spore produced by red algae. After fertilization, the alga's carpogonium subdivides into carpospores, and generally the largest type of spore (larger than bispores, which are larger again than tetraspores Tetraspores are ...s 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] |
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 is a syncyti ... [...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] |
Tetrasporangia
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 that la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
