|
Argyrochosma Pallens
''Argyrochosma pallens'' is a fern endemic to Mexico. It has narrow, divided leaves with brown axes; the leaves are dusted with white powder above and coated in it below. First described as a species in 1956, it was transferred to the new genus ''Argyrochosma'' (the "false cloak ferns") in 1987, recognizing their distinctness from the "cloak ferns" (''Notholaena'' ''sensu stricto''). Description ''Argyrochosma pallens'' is a medium-sized epipetric fern. The rhizome may be upright or decumbent (horizontal, curving upward at the tip). It bears linear to lanceolate scales long that terminate in a fine hair, of a uniform reddish-brown color, with entire (toothless) margins. From it, the fronds arise in clumps. From base to tip of leaf, they are up to long. Of this length, from 20% to 33% is made up by the stipe (the stalk of the leaf, below the blade). Both stipe and rachis (leaf axis) are round and chestnut-brown, bearing farina (powder) and a scattering of narrow linear or slig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Alfred Weatherby
Charles Alfred Weatherby (1875–1949) was an American botanist. Weatherby was born in Hartford, Connecticut, to Charles Nathaniel Weatherby and his wife, the former Grace Weld. Not long after Charles Alfred's birth, the family moved to Colorado. However, when he reached school age his parents sent him back to Connecticut. Weatherby studied literature at Harvard University, graduating summa cum laude in 1897. From 1899 to 1905 Weatherby was ill and lived with his mother in East Hartford. It was during this time he began his interest in botany and joined the Connecticut Botanical Society. In 1910 Weatherby went to Europe, where he met Una Leonora Foster, an artist with an interest in botany. They married in 1917. Weatherby later volunteered as an assistant at the Gray Herbarium, then was an assistant curator and eventually the curator, specializing in the study of wildflowers. In 1910, he published and described a new tree, ''Quercus rysophylla ''Quercus rysophylla'', the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argyrochosma Incana
''Argyrochosma incana'', the hairy false cloak fern, is a fern known from the southwestern United States through Mexico to Guatemala, and from a disjunct population in the Dominican Republic. It grows on rocky slopes and steep banks, often in forests. Like many of the false cloak ferns, it bears white powder on the underside of its leaves. First described as a species in 1825, it was transferred to the new genus ''Argyrochosma'' (the "false cloak ferns") in 1987, recognizing their distinctness from the "cloak ferns" (''Notholaena'' ''sensu stricto''). Description ''Argyrochosma incana'' is a medium-sized epipetric fern. The rhizome is short, thick, and may be horizontal or somewhat upright. It bears linear to lanceolate or linear-ligulate (straplike) scales long and wide, without teeth at the margins and long-attenuate at the tip. They are of a uniform dark, shiny brown, chestnut-brown or yellowish-brown color with some dark brown patches. From the rhizome, the fronds arise in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argyrochosma Pilifera
''Argyrochosma pilifera'' is a fern endemic to Mexico. It has lance-shaped, divided leaves with dark purple axes; the undersides of the leaves are coated in white powder. First described as a species in 1956, it was transferred to the new genus ''Argyrochosma'' (the "false cloak ferns") in 1987, recognizing their distinctness from the "cloak ferns" (''Notholaena'' ''sensu stricto''). Description ''Argyrochosma pilifera'' is a medium-sized epipetric fern. The short, compact rhizome may be upright or horizontal. It bears thin, linear scales long, of an orange-brown to dark-brown color, with entire (toothless) margins. From it, the fronds arise in clumps. From base to tip of leaf, they are up to long. Of this length, about 40% is made up by the stipe (the stalk of the leaf, below the blade). Both stipe and rachis (leaf axis) are round and of a dark purplish color, bearing sparse, drooping hairs. The leaf blades are lanceolate in shape. They are bipinnate to bipinnate-pinnatifid ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argyrochosma Peninsularis
''Argyrochosma peninsularis'' is a fern endemic to Baja California Sur. It grows in dry, rocky places. First described as a species in 1939, it was transferred to the new genus ''Argyrochosma'' (the "false cloak ferns") in 1987, recognizing their distinctness from the "cloak ferns" (''Notholaena'' ''sensu stricto''). A dusting of powdery material and the presence of occasional scales on the central axis of its leaves help distinguish it from related species. Description ''Argyrochosma peninsularis'' is a medium-sized epipetric fern. The rhizome is short and compact, and may be horizontal or upright. It bears linear-subulate (awl-shaped) or lanceolate scales, long and acuminate at the tip, with entire (toothless) margins. They are of a uniform color, pale to chestnut brown or orange-brown. Fronds arise from the rhizome in clumps; they measure in total length, sometimes as short as , about 40% of which is made up by the stipe (the stalk of the leaf, below the blade). The stipe i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Argyrochosma Delicatula
''Argyrochosma delicatula'' is a fern known from northeastern Mexico (and from one collection in Arizona). It grows in rocky habitats, either in sun or in shade, and is distinguished from similar species by the presence of pale yellow (rather than white) powder on the underside of its leaves. First described as a species in 1939, it was transferred to the new genus ''Argyrochosma'' (the "false cloak ferns") in 1987, recognizing their distinctness from the "cloak ferns" (''Notholaena'' ''sensu stricto''). Description ''Argyrochosma delicatula'' is a medium-sized epipetric fern. The rhizome is compact, and may be horizontal or upright. It bears slender, linear to linear-subulate scales long and wide, of a uniform orange-brown to dark brown color, with entire (toothless) margins and long-acuminate at the tip. From it, the fronds arise in clumps. From base to tip of leaf, they are long, occasionally as short as or as long as . Of this length, nearly half is made up by the stipe ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clade
A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, the equivalent Latin term ''cladus'' (plural ''cladi'') is often used in taxonomical literature. The common ancestor may be an individual, a population, or a species (extinct or extant). Clades are nested, one in another, as each branch in turn splits into smaller branches. These splits reflect evolutionary history as populations diverged and evolved independently. Clades are termed monophyletic (Greek: "one clan") groups. Over the last few decades, the cladistic approach has revolutionized biological classification and revealed surprising evolutionary relationships among organisms. Increasingly, taxonomists try to avoid naming taxa that are not clades; that is, taxa that are not monophyletic. Some of the relationships between org ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hemionitis
''Hemionitis'' is a genus of ferns in the subfamily Cheilanthoideae of the family Pteridaceae. Its circumscription varies greatly in different systems of fern classification. In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), it was one of more than 20 genera in the subfamily Cheilanthoideae, and was said to have five species. Other sources treat it as the only genus in the subfamily, and so accept about 450 species. With the restricted circumscription, species are native to tropical America. Taxonomy The genus ''Hemionitis'' was first described by Carl Linnaeus in 1753. The genus name is pre-Linnaean, being used for example in the '' Hortus Cliffortianus'', and derives from the Greek word (), meaning 'mule', referring to the belief that the plants were sterile. (Linnaeus used the same word in the name "''Asplenium hemionitis''".) The division of the subfamily Cheilanthoideae into genera varies greatly between sources . Christenhusz et al. (2011), the Pt ... [...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] |
Notholaena Nivea
''Argyrochosma nivea'' is an Andean fern species in the genus ''Argyrochosma''. Description Morphology The rhizome is short, thick, and more or less upright. It bears thin, delicate linear-subulate scales, long and of a uniform chestnut-brown color. The margins are entire (without teeth), or the walls of the marginal cells may project from the margin. The scales often become strongly crisped (wavy) when dried. The leaves are long and arise close together from the rhizome. The stipe (the stalk of the leaf, below the blade) is slender, rounded, dull (rather than shiny), lacks hairs and scales, and varies from a bright to a dark chestnut-brown. It is typically shorter than to about as long as the leaf blade. The leaf blades are lanceolate or deltate-lanceolate to ovate in shape, and tripinnate (cut into pinnae, pinnules, and pinnulets). The rachis (leaf axis) is similar in appearance to the stipe. It bears up to 12 pairs of pinnae, nearly opposite to one another, on stalks ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Edwin Copeland
Edwin Bingham Copeland (September 30, 1873 – March 16, 1964) was an American botanist and agriculturist. He is known for founding the University of the Philippines College of Agriculture at Los Baños, Laguna and for being one of the America's leading pteridologists (one who studies ferns). Life In 1903, he and his family moved to the Philippines, where he worked as a Systematic Botanist for the Bureau of Science. Wagner, W.H. Jr. 1964Edwin Bingham Copeland (1873–1964) and his contributions to Pteridology American Fern Journal 54(4): 177–188. In 1909, he founded the University of the Philippines College of Agriculture at Los Baños, Laguna, now part of the University of the Philippines Los Baños, and served as its dean and also as a professor of plant physiology for eight years (1909–1917). In 1917, he returned to the United States and was a leading rice grower in Chico, California. In 1927, he began work as an Associate Curator at the University of California, Berkel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type Specimen
In biology, a type is a particular specimen (or in some cases a group of specimens) of an organism to which the scientific name of that organism is formally attached. In other words, a type is an example that serves to anchor or centralizes the defining features of that particular taxon. In older usage (pre-1900 in botany), a type was a taxon rather than a specimen. A taxon is a scientifically named grouping of organisms with other like organisms, a set that includes some organisms and excludes others, based on a detailed published description (for example a species description) and on the provision of type material, which is usually available to scientists for examination in a major museum research collection, or similar institution. Type specimen According to a precise set of rules laid down in the International Code of Zoological Nomenclature (ICZN) and the International Code of Nomenclature for algae, fungi, and plants (ICN), the scientific name of every taxon is almost ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Durango
Durango (), officially named Estado Libre y Soberano de Durango ( en, Free and Sovereign State of Durango; Tepehuán: ''Korian''; Nahuatl: ''Tepēhuahcān''), is one of the 31 states which make up the 32 Federal Entities of Mexico, situated in the northwest of the country. With a population of 1,832,650, the 8th lowest of Mexico's states, Durango has Mexico's second-lowest population density, after Baja California Sur. The capital city, Victoria de Durango, is named after the first President of Mexico, Guadalupe Victoria. Geography General information With , Durango accounts for about 6.3% of the entire territory of Mexico. It is the fourth largest state lying at the extreme northwest of the Central Mexican Plateau, where it meets the Sierra Madre Occidental—the highest peaks in the state. The state has an average elevation of 1,775 meters above sea level, with a mean elevation of 1,750 m in the Valleys region and 2,450 m in the Sierra region. The city of Durango is o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
.jpg "Click for more on -> Type Specimen")
.svg "Click for more on -> Durango"){kind=logo}