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Notothyladaceae
The Notothyladaceae is the only family of hornworts in the order Notothyladales. Description Plants in the Notothyladaceae grow as a solid, flattened green structure ( thallus) without internal air spaces, unlike some other hornwort families that have cavities within their tissues. Their reproductive structures include male organs ( antheridia) that develop in small chambers within the thallus, with each chamber typically containing between two and eight antheridia. The spore-producing structures may or may not have tiny pores (stomata) on their surface. The spores range in colour from yellow to blackish and often have a distinctive band (equatorial girdle) around their middle. Within the cells, the chloroplasts (structures responsible for photosynthesis) may or may not contain a central protein body called a pyrenoid. Distribution and habitat The family has a global distribution, with different genera showing distinct patterns. The genus ''Notothylas'' reaches its highest ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hornworts
Hornworts are a group of Non-vascular plant, non-vascular Embryophytes (land plants) constituting the division Anthocerotophyta (). The common name refers to the elongated horn-like structure, which is the sporophyte. As in mosses and liverworts, hornworts have a gametophyte-dominant life cycle, in which cells of the plant carry only a single set of genetic information; the flattened, green plant body of a hornwort is the gametophyte stage of the plant. Hornworts may be found worldwide, though they tend to grow only in places that are damp or humid. Some species grow in large numbers as tiny weeds in the soil of gardens and cultivated fields. Large tropical and sub-tropical species of ''Dendroceros'' may be found growing on the bark of trees. The total number of species is still uncertain. While there are more than 300 published species names, the actual number could be as low as 100–150 species. Description Like all bryophytes, the dominant life phase of a hornwort is the h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hornwort
Hornworts are a group of non-vascular Embryophytes (land plants) constituting the division Anthocerotophyta (). The common name refers to the elongated horn-like structure, which is the sporophyte. As in mosses and liverworts, hornworts have a gametophyte-dominant life cycle, in which cells of the plant carry only a single set of genetic information; the flattened, green plant body of a hornwort is the gametophyte stage of the plant. Hornworts may be found worldwide, though they tend to grow only in places that are damp or humid. Some species grow in large numbers as tiny weeds in the soil of gardens and cultivated fields. Large tropical and sub-tropical species of ''Dendroceros'' may be found growing on the bark of trees. The total number of species is still uncertain. While there are more than 300 published species names, the actual number could be as low as 100–150 species. Description Like all bryophytes, the dominant life phase of a hornwort is the haploid gametophyt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Notothylas Guizhouensis
''Notothylas'' is a genus of hornworts in the family Notothyladaceae. The genus is found globally, but is usually overlooked. It is the smallest of all the hornworts, with a yellow-green gametophyte thallus that is seldom more than a centimeter in diameter, and usually much smaller. The genus ''Notothylas'' is also unusual among hornworts in that the sporophyte is bullet-shaped and does not grow very large (less than two millimeters). The sporophytes grow outwards rather than upwards, and like ''Megaceros'', there are no stomata on the surface of the sporophyte. The elater cells do not grow helical thickenings. Unlike many hornworts, species in ''Notothylas'' tolerate full sunlight. A number of classification systems place ''Notothylas'' in its own order Notothyladales (frequently misspelled ''Notothylales'' in the literature). This classification is based on the assumption that the unique physical characteristics of the genus reflect an early divergence from other hornwor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mesoceros
''Mesoceros'' is a genus of hornworts belonging to the family Notothyladaceae The Notothyladaceae is the only family of hornworts in the order Notothyladales. Description Plants in the Notothyladaceae grow as a solid, flattened green structure ( thallus) without internal air spaces, unlike some other hornwort families .... The species of this genus are found in Australia. Species: *'' Mesoceros mesophoros'' *'' Mesoceros porcatus'' References Hornwort genera {{bryophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phaeoceros
''Phaeoceros'' is a genus of hornworts in the family Notothyladaceae. The genus is global in its distribution. Its name means 'yellow horn', and refers to the characteristic yellow spores that the plants produce in the horn-shaped sporophyte. The genus ''Phaeoceros'' was first recognized in 1951 by Johannes Max Proskauer. The type species is '' Phaeoceros laevis''. The genus is distinguished by having yellow spores, different chloroplast structure, relatively less frilliness of the thallus when compared to ''Anthoceros'', and a relative lack of internal cavities in ''Phaeoceros''. The yellow color of the spores is the easiest way to distinguish ''Phaeoceros'' from the common genus ''Anthoceros ''Anthoceros'' is a genus of hornworts in the family Anthocerotaceae. It is distributed globally. Species of ''Anthoceros'' are characterized by having a small to medium-sized, green thallus that is more or less lobed along the margins. Etym ...'', which produces spores that are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Photosynthesis
Photosynthesis ( ) is a system of biological processes by which photosynthetic organisms, such as most plants, algae, and cyanobacteria, convert light energy, typically from sunlight, into the chemical energy necessary to fuel their metabolism. ''Photosynthesis'' usually refers to oxygenic photosynthesis, a process that produces oxygen. Photosynthetic organisms store the chemical energy so produced within intracellular organic compounds (compounds containing carbon) like sugars, glycogen, cellulose and starches. To use this stored chemical energy, an organism's cells metabolize the organic compounds through cellular respiration. Photosynthesis plays a critical role in producing and maintaining the oxygen content of the Earth's atmosphere, and it supplies most of the biological energy necessary for complex life on Earth. Some bacteria also perform anoxygenic photosynthesis, which uses bacteriochlorophyll to split hydrogen sulfide as a reductant instead of water, p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Congener (biology)
Biological specificity is the tendency of a characteristic such as a behavior or a biochemical variation to occur in a particular species. Biochemist Linus Pauling stated that "Biological specificity is the set of characteristics of living organisms or constituents of living organisms of being special or doing something special. Each animal or plant species is special. It differs in some way from all other species...biological specificity is the major problem about understanding life." Biological specificity within ''Homo sapiens'' ''Homo sapiens'' has many characteristics that show the biological specificity in the form of behavior and morphology (biology), morphological traits. Morphologically, humans have an enlarged cranial capacity and more gracile features in comparison to other Hominini, hominins. The reduction of dentition is a feature that allows for the advantage of adaptability in diet and survival. As a species, humans are culture dependent and much of human survival ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Guizhou
) , image_skyline = , image_caption = , image_map = Guizhou in China (+all claims hatched).svg , mapsize = 275px , map_alt = Map showing the location of Guizhou Province , map_caption = Map showing the location of Guizhou Province , coordinates = , subdivision_type = Country , subdivision_name = China , named_for = Gui - Gui Mountains ''zhou (political division), zhou'' (prefecture) , seat_type = Capital , seat = Guiyang , seat1_type = Largest city , seat1 = Zunyi , parts_type = Divisions , parts_style = para , p1 = 9 Prefectures of China, prefectures , p2 = 88 Counties of China, counties , p3 = 1539 Townships of China, townships , government_type = Provinces of China, Province , governing_body = Guizhou Provincial People's Congress , leader_title = Party Secretary of Guiz ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tropical
The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's axial tilt; the width of the tropics (in latitude) is twice the tilt. The tropics are also referred to as the tropical zone and the torrid zone (see geographical zone). Due to the overhead sun, the tropics receive the most solar energy over the course of the year, and consequently have the highest temperatures on the planet. Even when not directly overhead, the sun is still close to overhead throughout the year, therefore the tropics also have the lowest seasonal variation on the planet; "winter" and "summer" lose their temperature contrast. Instead, seasons are more commonly divided by precipitation variations than by temperature variations. The tropics maintain wide diversity of local climates, such as rain forests, monsoons, sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Temperate
In geography, the temperate climates of Earth occur in the middle latitudes (approximately 23.5° to 66.5° N/S of the Equator), which span between the tropics and the polar regions of Earth. These zones generally have wider temperature ranges throughout the year and more distinct seasonal changes compared to tropical climates, where such variations are often small; they usually differ only in the amount of precipitation. In temperate climates, not only do latitude, latitudinal positions influence temperature changes, but various sea currents, prevailing wind direction, continentality (how large a landmass is) and altitude also shape temperate climates. The Köppen climate classification defines a climate as "temperate" C, when the mean temperature is above but below in the coldest month to account for the persistence of frost. However, some adaptations of Köppen set the minimum at . Continental climate, Continental climates are classified as D and considered to be varie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cosmopolitan Distribution
In biogeography, a cosmopolitan distribution is the range of a taxon that extends across most or all of the surface of the Earth, in appropriate habitats; most cosmopolitan species are known to be highly adaptable to a range of climatic and environmental conditions, though this is not always so. Killer whales ( orcas) are among the most well-known cosmopolitan species on the planet, as they maintain several different resident and transient (migratory) populations in every major oceanic body on Earth, from the Arctic Circle to Antarctica and every coastal and open-water region in-between. Such a taxon (usually a species) is said to have a ''cosmopolitan'' distribution, or exhibit cosmopolitanism, as a species; another example, the rock dove (commonly referred to as a ' pigeon'), in addition to having been bred domestically for centuries, now occurs in most urban areas around the world. The extreme opposite of a cosmopolitan species is an endemic (native) species, or one foun ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
