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Myriopteris Scabra
''Myriopteris scabra'', previously known as ''Pellaea scabra'', ''Cheilanthes aspera'' or ''Cheilanthes horridula'', is a species of cheilanthoid fern with the common name rough lipfern. It is native to Mexico and to Texas in the United States. Description ''Myriopteris scabra'' grows from a short creeping rhizome, usually 4–7 mm in diameter with brown scales. The leaves (fronds) are clustered and may range greatly in size from 5–30 cm long. The leaf petiole is black to dark brown. The leaf blade is 1–4 cm wide, linear-oblong to lanceolate, and up to pinnate-pinnatifid to 2-pinnate. The rachis has scattered linear-lanceolate scales and dimorphic pubescence, abaxially sparsely hirsute, adaxially covered with tortuous appressed hairs. The ultimate leaflets are narrowly elliptic to elongate-deltate, not beadlike, and up to 3–5 mm long. The upper leaflet surface has a distinctive rough or spiky surface, which distinguishes this species from most other ''M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. The most recent rigorous estimate for the total number of species of eukaryotes is between 8 and 8.7 million. However, only about 14% of these had been described by 2011. All species (except viruses) are given a two-part name, a "binomial". The first part of a binomial is the genus to which the species belongs. The second part is called the specific name or the specific epithet (in botanical nomenclature, also sometimes i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cheilanthoid
Cheilanthoideae is one of the five subfamilies of the fern family Pteridaceae. The subfamily is thought to be monophyletic, but some of the genera into which it has been divided are not, and the taxonomic status of many of its genera and species remains uncertain, with radically different approaches in use . Phylogenic relationships The following phylogram shows a likely relationship between Cheilanthoideae and the other Pteridaceae subfamilies. Although subfamily Cheilanthoideae itself is thought to be monophyletic, many of the genera into which it has been divided (including ''Cheilanthes'', ''Doryopteris'', ''Notholaena'', and ''Pellaea'') have been shown to be polyphyletic. Genera The division of the subfamily Cheilanthoideae into genera and species remains uncertain . Christenhusz et al. (2011), the Pteridophyte Phylogeny Group classification of 2016 (PPG I), and the November 2019 version of the ''Checklist of Ferns and Lycophytes of the World'' (''World Ferns'' 8.1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myriopteris
''Myriopteris'', commonly known as the lip ferns, is a genus of cheilanthoid ferns. Like other cheilanthoids, they are ferns of dry habitats, reproducing both sexually and apogamously. Many species have leaves divided into a large number of small, bead-like segments, the probable inspiration for the generic name. Hairs and/or scales are often present on both the upper and lower surfaces of the leaf, and their presence and appearance are useful in distinguishing between species. The genus is most diverse in Mexico, but species are found from southwestern Canada south to southern Chile, and one species is endemic to southern Africa. Description No single morphological character divides ''Myriopteris'', as presently circumscribed, from the other cheilanthoids. Convergent evolution in arid environments is thought to be responsible for widespread homoplasy in the morphological characters traditionally used to classify this group. While small, bead-like ultimate segments are associate ... [...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] |
Myriopteris Alabamensis
''Myriopteris alabamensis'', the Alabama lip fern, is a moderately-sized fern of the United States and Mexico, a member of the family Pteridaceae. Unlike many members of its genus, its leaves have a few hairs on upper and lower surfaces, or lack them entirely. One of the cheilanthoid ferns, it was usually classified in the genus ''Cheilanthes'' as ''Cheilanthes alabamensis'' until 2013, when the genus ''Myriopteris'' was again recognized as separate from ''Cheilanthes''. It typically grows in shade on limestone outcrops. Description Leaf bases are closely spaced along the rhizome, which is variously described as or in diameter. The rhizome bears persistent scales, which are Glossary of leaf morphology#linear, linear to narrowly Glossary of leaf morphology#lanceolate, lanceolate, distantly toothed, straight or slightly twisted, and loosely Glossary of botanical terms#appressed, appressed (pressed against the surface of the rhizome). The scales may be uniformly brown or orange-br ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myriopteris Aemula
''Myriopteris aemula'', the Texas lip fern or rival lip fern, is a moderately-sized fern of Texas and Mexico, a member of the family Pteridaceae. Unlike many members of its genus, its leaves have a few hairs on upper and lower surfaces, or lack them entirely. One of the cheilanthoid ferns, it was usually classified in the genus ''Cheilanthes'' as ''Cheilanthes aemula'' until 2013, when the genus ''Myriopteris'' was again recognized as separate from ''Cheilanthes''. It typically grows on limestone rock. Description Leaf bases are closely spaced along the rhizome, variously described as or in diameter. The rhizome bears persistent scales, which are linear to narrowly lanceolate, straight or slightly twisted, and loosely appressed (pressed against the surface of the rhizome). Their margins are entire (untoothed). They may be uniformly brown or tan to orange-brown in color, or be darker at their base, particularly in the center. The fronds spring up in clusters; they do not ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myriopteris Microphylla
''Myriopteris'', commonly known as the lip ferns, is a genus of cheilanthoid ferns. Like other cheilanthoids, they are ferns of dry habitats, reproducing both sexually and apogamously. Many species have leaves divided into a large number of small, bead-like segments, the probable inspiration for the generic name. Hairs and/or scales are often present on both the upper and lower surfaces of the leaf, and their presence and appearance are useful in distinguishing between species. The genus is most diverse in Mexico, but species are found from southwestern Canada south to southern Chile, and one species is endemic to southern Africa. Description No single morphological character divides ''Myriopteris'', as presently circumscribed, from the other cheilanthoids. Convergent evolution in arid environments is thought to be responsible for widespread homoplasy in the morphological characters traditionally used to classify this group. While small, bead-like ultimate segments are associate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myriopteris Gracilis
''Myriopteris gracilis'', formerly known as ''Cheilanthes feei'', is a species of lip fern known by the common name slender lip fern or Fee's lip fern. Description ''Myriopteris gracilis'' grows from a short creeping rhizome with pale to red-brown scales usually with a dark mid-stripe. The leaves are gray to pale green and 6 to 18 cm long and 1.5 to 3 cm wide. Each leaflet on the leaf is divided into lobes which are divided once more into rounded segments (3-pinnate). The undersides of the segments are concave and densely covered with short pale to dark tan hairs. The sori line the edges of the segment undersides and may be buried under the hairs. The fern reproduces asexually by apogamy. Distribution and habitat ''Myriopteris gracilis'' is native to much of western North America from British Columbia and Alberta to northern Mexico, and throughout much of the central United States. It is found in rocky areas, generally on calcareous rock such as limestone where it grows in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Myriopteris Fimbriata
''Myriopteris'', commonly known as the lip ferns, is a genus of cheilanthoid ferns. Like other cheilanthoids, they are ferns of dry habitats, reproducing both sexually and apogamously. Many species have leaves divided into a large number of small, bead-like segments, the probable inspiration for the generic name. Hairs and/or scales are often present on both the upper and lower surfaces of the leaf, and their presence and appearance are useful in distinguishing between species. The genus is most diverse in Mexico, but species are found from southwestern Canada south to southern Chile, and one species is endemic to southern Africa. Description No single morphological character divides ''Myriopteris'', as presently circumscribed, from the other cheilanthoids. Convergent evolution in arid environments is thought to be responsible for widespread homoplasy in the morphological characters traditionally used to classify this group. While small, bead-like ultimate segments are associat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora Of Texas
Flora is all the plant life present in a particular region or time, generally the naturally occurring (indigenous) native plants. Sometimes bacteria and fungi are also referred to as flora, as in the terms '' gut flora'' or '' skin flora''. Etymology The word "flora" comes from the Latin name of Flora, the goddess of plants, flowers, and fertility in Roman mythology. The technical term "flora" is then derived from a metonymy of this goddess at the end of the sixteenth century. It was first used in poetry to denote the natural vegetation of an area, but soon also assumed the meaning of a work cataloguing such vegetation. Moreover, "Flora" was used to refer to the flowers of an artificial garden in the seventeenth century. The distinction between vegetation (the general appearance of a community) and flora (the taxonomic composition of a community) was first made by Jules Thurmann (1849). Prior to this, the two terms were used indiscriminately.Thurmann, J. (1849). ''Essai de ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flora Of 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] |
