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Sirodotia
''Sirodotia'' Kylin (1912) is a genus of freshwater red alga which was described by Kylin in 1912, and placed in the Batrachospermaceae family. The genus name of ''Sirodotia'' is in honour of Simon Sirodot (1825–1903), who was a French botanist, algologist and teacher. He was also a Zoologist and Archaeologist, who taught at schools in Toulouse, Strasbourg, Le Mans, Cahors and Limoges. Taxonomy The family Batrachospermaceae belongs to the order Batrachospermales and has six well known genera namely '' Batrachospermum'', '' Kumanoa'', ''Sirodotia'', '' Nothocladus'', '' Tuomeya'', and '' Sheathia''. The morphology of the gametophyte of ''Batrachospermum'', ''Sirodotia'', ''Tuomeya'', and ''Nothocladus'' are more are less similar to each other. Necchi and Entwisle (1990) proposed to delimit them from generic level to section level of genus ''Batrachospermum''. ''Sheathia'' was the member of genus ''Batrachospermum'' and has risen to generic level. phylogenetic studies revea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Batrachospermaceae
Batrachospermaceae is a family of fresh water red algae 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 ... (Rhodophyta). Genera within the Batrachospermaceae generally have a "''Lemanea-''type" life history with carpospores germinating to produce chantransia. Sporophyte phase with meiosis occurs in an apical cell to produce the gametophyte stage. Pit connections have two pit plug cap layers with the other layer enlarged. This family of freshwater red algae is uniaxial, meaning each filament with a single apical cell. The genera included within Batrachospermaceae are listed in the table below. References Batrachospermales Red algae families {{rhodophyta-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Timothy John Entwisle
Timothy John Entwisle (born 1960), is an Australian botanist, much of whose research work is in phycology (algae). See for example the articles. He was awarded a Ph.D. from La Trobe University in 1986 for work on the taxonomy of '' Vaucheria''. He was New South Wales’ Government Botanist in 2007 and 2008, and for eight years was the executive director of the Royal Botanic Gardens Sydney (2003–2011). Subsequently, he was director of Conservation, Living Collections and Estates, Kew, London from 2011, and since 2013 he has been director of the Royal Botanic Gardens Victoria. He is an honorary professorial fellow at the University of Melbourne and is currently (2020) president of the International Association of Botanic Gardens. As director of the Royal Botanic Gardens Sydney, Entwisle managed Sydney's Royal Botanic Gardens, the Mount Tomah Botanic Garden, in the Blue Mountains and the Mount Annan Botanic Garden, near Camden, and at Kew, he was responsible for Kew Gard ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harald Kylin
Johan Harald Kylin (5 February 1879 – 16 December 1949) was a Swedish botanist Botany, also called , plant biology or phytology, is the science of plant life and a branch of biology. A botanist, plant scientist or phytologist is a scientist who specialises in this field. The term "botany" comes from the Ancient Greek wo ... specializing in phycology and a professor at Lund University. He was also editor of the Botaniska Notiser, a Swedish scientific periodical from 1922 to 1928. Works * ''Die Gattungen der Rhodophyceen'' References 20th-century Swedish botanists 1879 births 1949 deaths {{botanist-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Meiosis
Meiosis (; , since it is a reductional division) is a special type of cell division of germ cells in sexually-reproducing organisms that produces the gametes, such as sperm or egg cells. It involves two rounds of division that ultimately result in four cells with only one copy of each chromosome ( haploid). Additionally, prior to the division, genetic material from the paternal and maternal copies of each chromosome is crossed over, creating new combinations of code on each chromosome. Later on, during fertilisation, the haploid cells produced by meiosis from a male and female will fuse to create a cell with two copies of each chromosome again, the zygote. Errors in meiosis resulting in aneuploidy (an abnormal number of chromosomes) are the leading known cause of miscarriage and the most frequent genetic cause of developmental disabilities. In meiosis, DNA replication is followed by two rounds of cell division to produce four daughter cells, each with half the number ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carpospore
A carpospore is a diploid spore produced by red algae. After fertilization, the alga's carpogonium The carpogonium (plural ''carpogonia'') is the female organ in the Red Algae (Rhodophyta) which have a highly specialized type of reproduction. It contains the reproductive nucleus. It may contain a number of cells usually without chloroplasts. It ... subdivides into carpospores, and generally the largest type of spore (larger than bispores, which are larger again than tetraspores). The wall of the carposporangium then breaks down, releasing the spores into the environment. References Red algae {{rhodophyta-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carposporophyte
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Carpogonial
The carpogonium (plural ''carpogonia'') is the female organ in the Red Algae (Rhodophyta) which have a highly specialized type of reproduction. It contains the reproductive nucleus. It may contain a number of cells usually without chloroplasts. It shows an elongated process which is the receptive organ for the male gametes. It gives birth to the carpospores. It may also have hairlike structures called ''trichogynes'' which receive sperm before fertilization takes place."trichogyne". Dictionary.com Unabridged. Random House, Inc. 14 Sep. 2017. Dictionary.com http://www.dictionary.com/browse/trichogyne References Red algae {{rhodophyta-stub ... [...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] |
