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Pellaea (plant)
''Pellaea'' is a genus of ferns in the Cheilanthoideae subfamily of the Pteridaceae. The genus name is derived from the Greek word πελλος (''pellos''), meaning "dark," and refers to the brown stems. Many members of the genus are commonly known as cliffbrakes. They primarily grow in rocky habitats, including moist rocky canyons, slopes, and bluffs. Distribution Ferns in this genus are most abundant and diverse in the southwestern United States south into Andean South America, central and southern Africa, and eastern Australia to New Zealand. Description These ferns typically have creeping rhizomes and pinnately to bipinnately compound leaves lacking prominent scales or trichomes on the blades. Like most members of Pteridaceae, they have marginal sori protected by a false indusium formed from the reflexed leaf margin. The distinction of ''Pellaea'' from the typically hairier or scalier '' Cheilanthes'' has proven difficult, with some members being of uncertain affinity ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pellaea Andromedifolia
''Pellaea andromedifolia'', with the common names coffee cliffbrake and coffee fern, is a species of Pellaea (plant), cliff brake fern in the Cheilanthoideae subfamily of the Pteridaceae. It is native to California in the United States and Baja California in Mexico. Description This plant does not have the immediately recognizable sharply pointed leaflets on its fronds that many other ferns have. Its leaves bear rounded or oval-shaped segments widely spaced along the rachis. Each segment may curl under along its edges. The leaves are green when new, then turn red, purplish, or brown. Some individuals of this species are diploid and reproduce sexually, while some are Polyploidy, triploid or tetraploid and reproduce by apogamy (growth of a plant from a gamete without fertilization). Habitat ''Pellaea andromedifolia'' is found on rocky outcrops and dry slopes in coastal, Mojave Desert, and California chaparral and woodlands habitats. It is able to take long periods without water, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pinnate
Pinnation (also called pennation) is the arrangement of feather-like or multi-divided features arising from both sides of a common axis. Pinnation occurs in biological morphology, in crystals, such as some forms of ice or metal crystals, and in patterns of erosion or stream beds. The term derives from the Latin word ''pinna'' meaning "feather", "wing", or "fin". A similar concept is "pectination," which is a comb-like arrangement of parts (arising from one side of an axis only). Pinnation is commonly referred to in contrast to "palmation," in which the parts or structures radiate out from a common point. The terms "pinnation" and "pennation" are cognate, and although they are sometimes used distinctly, there is no consistent difference in the meaning or usage of the two words.Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Derivation and Accent; Published by Gerald Duckworth & Co. London, 4th ed 1928 Plants Botanically, pinnation is an arrangement of discr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Angola
, national_anthem = " Angola Avante"() , image_map = , map_caption = , capital = Luanda , religion = , religion_year = 2020 , religion_ref = , coordinates = , largest_city = capital , official_languages = Portuguese , languages2_type = National languages , languages2 = , ethnic_groups = , ethnic_groups_ref = , ethnic_groups_year = 2000 , demonym = , government_type = Unitary dominant-party presidential republic , leader_title1 = President , leader_name1 = João Lourenço , leader_title2 = Vice President , leader_name2 = Esperança da CostaInvestidura do Pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mexico
Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Mexico covers ,Mexico ''''. . making it the world's 13th-largest country by are ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colombia
Colombia (, ; ), officially the Republic of Colombia, is a country in South America with insular regions in North America—near Nicaragua's Caribbean coast—as well as in the Pacific Ocean. The Colombian mainland is bordered by the Caribbean Sea to the north, Venezuela to the east and northeast, Brazil to the southeast, Ecuador and Peru to the south and southwest, the Pacific Ocean to the west, and Panama to the northwest. Colombia is divided into 32 departments and the Capital District of Bogotá, the country's largest city. It covers an area of 1,141,748 square kilometers (440,831 sq mi), and has a population of 52 million. Colombia's cultural heritage—including language, religion, cuisine, and art—reflects its history as a Spanish colony, fusing cultural elements brought by immigration from Europe and the Middle East, with those brought by enslaved Africans, as well as with those of the various Amerindian civilizations that predate colonization. Spanish is th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pellaea Falcata
''Pellaea falcata'', the sickle fern, is a widespread and common plant, growing in eastern Australia. It is often seen in on the coast and ranges in eucalyptus forest and rainforest. It grows in Tasmania, Victoria, New South Wales, Queensland, and Lord Howe Island. The fronds are usually 37 to 105 cm long. Each frond has between 27 and 65 leaflets, sometimes more. These pinnae (fern leaflets) have an absent or short talk, oblong to narrow-oblong in shape. The pinnae are 22 to 56 mm long and 5 to 12 mm wide. The sori form a continuous band along the edges of each pinna. ''Pellaea falcata'' is grown as an ornamental plant in gardens. It prefers ample water when grown indoors and can take very bright light but not full sun. References * Plant Net http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Pellaea~falcata Retrieved 17 September 2009 falcata The falcata is a type of sword typical of pre-Roman Iberia. The falcata was used to grea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pellaea Rotundifolia
''Pellaea rotundifolia'', the button fern, is a species of fern endemic to New Zealand, where it grows in scrub and forests. It is also a popular garden plant (in zones 8 and 9) and house plant, tolerating low temperatures but not freezing. ''Pellaea rotundifolia'' is a compact, evergreen fern that can have more than 30 pairs of round, dark-green, leathery pinnae on fronds up to in length.Olsen, Sue. Encyclopedia of Garden Ferns. 2007. The Latin specific epithet ''rotundifolia'' means "round-leaved". Cultivation It needs acidic and well-drained soil; it does not appreciate the moist, humid conditions that most ferns require so does well with minimal watering. This plant has gained the Royal Horticultural Society's Award of Garden Merit The Award of Garden Merit (AGM) is a long-established annual award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions. History The Award of Garden M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ormopteris
''Ormopteris'' is a genus of ferns in the subfamily Cheilanthoideae of the family Pteridaceae. Species are native to Brazil and Venezuela Venezuela (; ), officially the Bolivarian Republic of Venezuela ( es, link=no, República Bolivariana de Venezuela), is a country on the northern coast of South America, consisting of a continental landmass and many islands and islets in th .... Species , the ''Checklist of Ferns and Lycophytes of the World'' recognized the following species: *'' Ormopteris crenata'' (R.M.Tryon) Barbará *'' Ormopteris cymbiformis'' (J.Prado) Barbará *'' Ormopteris flavescens'' (Fée) Barbará *'' Ormopteris gleichenioides'' (Gardner) J.Sm. *'' Ormopteris pinnata'' (Kaulf.) Lellinger *'' Ormopteris riedelii'' (Baker) Barbará References Pteridaceae Fern genera {{Pteridaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phenotype
In genetics, the phenotype () is the set of observable characteristics or traits of an organism. The term covers the organism's morphology or physical form and structure, its developmental processes, its biochemical and physiological properties, its behavior, and the products of behavior. An organism's phenotype results from two basic factors: the expression of an organism's genetic code, or its genotype, and the influence of environmental factors. Both factors may interact, further affecting phenotype. When two or more clearly different phenotypes exist in the same population of a species, the species is called polymorphic. A well-documented example of polymorphism is Labrador Retriever coloring; while the coat color depends on many genes, it is clearly seen in the environment as yellow, black, and brown. Richard Dawkins in 1978 and then again in his 1982 book ''The Extended Phenotype'' suggested that one can regard bird nests and other built structures such as cad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Convergent Evolution
Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last common ancestor of those groups. The cladistic term for the same phenomenon is homoplasy. The recurrent evolution of flight is a classic example, as flying insects, birds, pterosaurs, and bats have independently evolved the useful capacity of flight. Functionally similar features that have arisen through convergent evolution are ''analogous'', whereas '' homologous'' structures or traits have a common origin but can have dissimilar functions. Bird, bat, and pterosaur wings are analogous structures, but their forelimbs are homologous, sharing an ancestral state despite serving different functions. The opposite of convergence is divergent evolution, where related species evolve different traits. Convergent evolution is similar to parallel evo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheilanthes
''Cheilanthes'', commonly known as lip ferns, is a genus of about 180 species of rock-dwelling ferns with a cosmopolitan distribution in warm, dry, rocky regions, often growing in small crevices high up on cliffs. Most are small, sturdy and evergreen. The leaves, often densely covered in trichomes, spring directly from the rootstocks. Many of them are desert ferns, curling up during dry times and reviving with the coming of moisture. At the ends of veins sporangia, or spore-bearing structures, are protected by leaf margins, which curl over them. Taxonomy The genus name is derived from the Greek words χεῖλος (''cheilos''), meaning "lip," and ἄνθος (''anthos''), meaning "flower." ''Cheilanthes'' as traditionally circumscribed is now known to be highly paraphyletic, comprising at least four generically separate groups. The type species, '' C. micropteris'', is most closely allied to the genera ''Aleuritopteris'' and '' Sinopteris'' (Schuettpelz ''et al.''). In the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
