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Zygodon Gracilis
''Zygodon gracilis'', the slender yokemoss, is a moss species in the genus ''Zygodon''. It is a rare lithophyte found to only grow on certain localities of limestone outcrops that has high calcium carbonate content. The current global conservation status of Z. ''gracilis'' is considered to be "imperiled". Morphology ''Zygodon gracilis'' is a dioicous, acrocarpus moss that grows in turfs of around 5 cm tall. The squarrose, lanceolate leaves bends away from the stem when moist and becomes contorted when dry. The leaves have distinctive toothed margins near the apex that sets it apart from other ''Zygodon'' species. Newer leaves appear dull green that become reddish-brown lower down in the shoot. Sporophytes are very rare and have only been documented twice, both in England in 1866 and most recently in 2002. The species do not exhibit any specialized asexual reproductive structures in the wild. Distribution Europe The species is found in temperate regions of Europe, with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Zygodon
''Zygodon'' is a genus of moss in family Orthotrichaceae. Species * '' Zygodon gracilis'' References Moss genera Orthotrichales Taxa named by Thomas Taylor (botanist) {{bryophyte-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithophyte
Lithophytes are plants that grow in or on rocks. They can be classified as either epilithic (or epipetric) or endolithic; epilithic lithophytes grow on the surfaces of rocks, while endolithic lithophytes grow in the crevices of rocks (and are also referred to as chasmophytes). Lithophytes can also be classified as being either obligate or facultative. Obligate lithophytes grow solely on rocks, while facultative lithophytes will grow partially on a rock and on another substrate simultaneously. Nutrients Lithophytes that grow on land feed off nutrients from rain water and nearby decaying plants, including their own dead tissue. It is easier for Chasmophytes to acquire nutrients because they grow in fissures in rocks where soil or organic matter has accumulated. For most Lithophytes, nitrogen is only available through interactions with the atmosphere. The most readily available form of nitrogen in the atmosphere is the gaseous state of ammonia (NH3). Lithophytes consume atmospheric a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dioicous
Dioicy () is a sexual system where archegonia and antheridia are produced on separate gametophytes. It is one of the two main sexual systems in bryophytes. Both dioicous () and monoicous gametophytes produce gametes in gametangia by mitosis rather than meiosis, so that sperm and eggs are genetically identical with their parent gametophyte. Description Dioicy promotes outcrossing. Sexual dimorphism is commonly found in dioicous species. However, according to Bernard Goffinet sexual dimorphism is rare in dioicous moss species. Dioicy is correlated with reduced sporophyte production, due to spatial separation of male and female colonies, scarcity or absence of males. The term dioecy is meaningless for bryophytes because it refers to the sexuality of sporophytes. Nonetheless dioecy and dioicy are comparable in many respects. Etymology The words dioicous and di(o)ecious are derived from οἶκος or οἰκία and δι- (di-), twice, double. (''(o)e'' is the Latin way of tra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hectad
A hectad is an area 10 km x 10 km square. The term has a particular use in connection with the British Ordnance Survey national grid, and then refers to any of the 100 such squares which make up a standard 100 km x 100 km myriad; these are denoted using the letter code of the 100 km square, and then a two-digit number consisting of the one-digit easting of the western bound of the hectad and the one-digit northing of its southern bound. See also * Tetrad (unit of area) A tetrad is an area 2 km x 2 km square. The term refers to any of the 25 such squares which make up a standard hectad. Tetrads are sometimes used by biologists for reporting the distribution of species to maintain a degree of confidentia ... Units of area {{measurement-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yorkshire Dales National Park
The Yorkshire Dales National Park is a national park in England covering most of the Yorkshire Dales. Most of the park is in North Yorkshire, with a sizeable area in Westmorland (Cumbria) and a small part in Lancashire. The park was designated in 1954, and extended in 2016. Over 95% of the land in the Park is under private ownership; there are over 1,000 farms in this area. In late 2020, the park was named as an International Dark Sky Reserve. This honour confirms that the area has "low levels of light pollution with good conditions for astronomy". Some 23,500 residents live in the park (as of 2017); a 2018 report estimated that the Park attracted over four million visitors per year. The economy consists primarily of tourism and agriculture. Location The park is north-east of Manchester; Otley, Ilkley, Leeds and Bradford lie to the south, while Kendal is to the west, Darlington to the north-east and Harrogate to the south-east. The national park does not include all of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Haida Gwaii
Haida Gwaii (; hai, X̱aaydag̱a Gwaay.yaay / , literally "Islands of the Haida people") is an archipelago located between off the northern Pacific coast of Canada. The islands are separated from the mainland to the east by the shallow Hecate Strait. Queen Charlotte Sound lies to the south, with Vancouver Island beyond. To the north, the disputed Dixon Entrance separates Haida Gwaii from the Alexander Archipelago in the U.S. state of Alaska. Haida Gwaii consists of two main islands: Graham Island () in the north and Moresby Island (, literally: south people island half, or "Islands of Beauty") in the south, along with approximately 400 smaller islands with a total landmass of . Other major islands include Anthony Island ( / ), Burnaby Island (), Lyell Island, Louise Island, Alder Island ( / ), and Kunghit Island. (For a fuller, but still incomplete, list see List of islands of British Columbia.) Part of the Canadian province of British Columbia, the islands were known f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carboniferous Limestone
Carboniferous Limestone is a collective term for the succession of limestones occurring widely throughout Great Britain and Ireland that were deposited during the Dinantian Epoch of the Carboniferous Period. These rocks formed between 363 and 325 million years ago. Within England and Wales, the entire limestone succession, which includes subordinate mudstones and some thin sandstones, is known as the Carboniferous Limestone Supergroup. Depositional basins Within Great Britain the suite of rocks known traditionally as the Carboniferous Limestone Series was deposited as marine sediments in three distinct ‘provinces’ separated by contemporary landmasses. One of these landmasses was the Wales-London-Brabant Massif, an east–west aligned belt of land stretching through central Wales and the English Midlands to East Anglia and on into Belgium. The limestones deposited to its south form a distinct South Wales-Mendip province which extends from Pembrokeshire in the west through ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
