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Selaginella Sibirica
''Selaginella sibirica'', the Siberian spikemoss, is a species of spikemoss ''Selaginella'' is the sole genus of vascular plants in the family Selaginellaceae, the spikemosses or lesser clubmosses. This family is distinguished from Lycopodiaceae (the clubmosses) by having scale-leaves bearing a ligule and by having ... that can be found in dry or exposed rocks and ridges from Alaska to the northwestern region of the district of Mackenzie as well as in northern Russia. The linear leaves are grooved on the back, 2.5-3 millimeters long, including the seta, and usually truncate near the top. Sporophylls are ovate to triangular, and are shorter than the leaves. It looks similar to S. densa, though it can be distinguished by its white setae, compared to the yellow setae of S. densa. Although all discovered specimens in North America are all similar, R.M. Tryon found a phase in Asia that has longer setae that are orange-brown rather than white.Tryon R.M. 1955 ''Selaginella rupe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selaginella
''Selaginella'' is the sole genus of vascular plants in the family Selaginellaceae, the spikemosses or lesser clubmosses. This family is distinguished from Lycopodiaceae (the clubmosses) by having scale-leaves bearing a ligule and by having spores of two types. They are sometimes included in an informal paraphyletic group called the "fern allies". '' S. moellendorffii'' is an important model organism. Its genome has been sequenced by the United States Department of Energy's Joint Genome Institute. The name ''Selaginella'' was erected by Palisot de Beauvois solely for the species ''Selaginella selaginoides'', which turns out (with the closely related ''Selaginella deflexa'') to be a clade that is sister to all other ''Selaginellas'', so any definitive subdivision of the species into separate genera leaves two taxa in ''Selaginella'', with the hundreds of other species in new or resurrected genera. ''Selaginella'' occurs mostly in the tropical regions of the world, with a hand ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
District Of Mackenzie
The District of Mackenzie was a regional administrative district of Canada's Northwest Territories. The district consisted of the portion of the Northwest Territories directly north of British Columbia, Alberta, and Saskatchewan on Canada's mainland. Along with the District of Keewatin and the District of Franklin, it was one of the last remaining districts of the old Northwest Territories before the formation of Nunavut in 1999, at which point it ceased to exist. As an administrative district of the NWT it had ceased to function several years prior to division. Today the area that formerly comprised the District of Mackenzie is mostly included in the Northwest Territories (which is no longer subdivided into districts). The remainder, along with all of Keewatin and most of Franklin, is in Nunavut. See also * Territorial evolution of Canada The history of post-confederation Canada began on July 1, 1867, when the British North American colonies of Canada, New Brunswick, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Selaginella Densa
''Selaginella densa'' is a species of spikemoss known by the common names lesser spikemoss, prairie spikemoss, and Rocky Mountains spikemoss. It is native to western North America, where it can be found from Alaska to Ontario, the Dakotas, Texas and far northern California. It grows in many types of habitat, from grassland to the alpine climates of high mountains, in rocky and sandy areas. It is a dominant plant in many types of prairie on the Great Plains, especially shortgrass prairie, where it grows alongside dominant grasses. It grows in windy, exposed, snow-free rock outcrops on mountain peaks in several ranges, including the Cascade Range and the Front Range of the Rocky Mountains. It is most common on dry soils in open areas, tolerating desiccation relatively easily. This lycophyte forms mats or cushions of creeping stems which fork into small, upright branches. The green, linear or lance-shaped leaves are up to 5 millimeters long including the short, soft bristles on t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
