nomes no trilho de navegação
Hamar antoserot (lat. Phaeoceros laevis) - mamırkimilər şöbəsinin phaeoceros cinsinə aid bitki növü.
Hamar antoserot (lat. Phaeoceros laevis) - mamırkimilər şöbəsinin phaeoceros cinsinə aid bitki növü.
Hlevíček hladký (Phaeoceros laevis) je druh mechorostu ze skupiny hlevíků.
Hlevíček hladký patří do skupiny hlevíků, jehož stélka je v obrysu okrouhlá, růžicovitá. V průměru má zhruba 2-3 cm je masitá, asi 6-10 buněk a k podkladu pevně přitisknutá. Okraje laloků stélky často zdvižené, nepříliš zařezávané. Na spodní straně vytvořeny průduchy a drobné dutiny (ale nikoliv slizové dutiny). Někdy jsou vytvořeny ventrální hlízky.
Sporofyt: Tobolka je přibližně 1-3cm dlouhá, jejíž výtrusy jsou žlutozeleně nebo žlutě zabarvené. Velikost výtrusu dosahuje 40µ a jsou bradavčitě papilnaté, avšak nikoliv ostnité.
Tento druh je možno jednoduše zaměnit s vycpálkou okrouhlou (Notothylas orbicularis), která se u nás vyskytuje v oblasti Hrubého Jeseníku, hojněji pak ve Švýcarsku. Liší se velikostí stélky, která může měřit v průměru o 0,5 cm více, než u hlevíčku hladkého.
Hlevíček hladký je téměř kosmopolitním druhem, vyskytující se od nížin až do výšek 800 m n. m. Nachází se podél cest, v příkopech, na vlhkých polích, úhorech a podél lesních potůčků. Výjimečně jej lze najít ve vyšších horách a v místech, kde je nízká teplota.
Obrázky, zvuky či videa k tématu hlevíček hladký ve Wikimedia Commons
Hlevíček hladký (Phaeoceros laevis) je druh mechorostu ze skupiny hlevíků.
Phaeoceros laevis, the smooth hornwort,[1] is a species of hornwort of the genus Phaeoceros. It is commonly found in areas where moisture is plentiful, such as moist soils in fields, the banks of streams and rivers or inundated beneath the surface of the rivers.[2] It grows to a maximum height of about 5 millimetres and the plants are monoecious; the sex organs are visible on the dorsal surface.[2]
The thallus is nearly flat on the upper surface. It is of dark green and somewhat lustrous color, devoid of intercellular spaces. Its capsule is commonly 6 inches (150 mm) to 18 inches (460 mm) in length. The base is surrounded by a cylindrical sheath that often flares at the mouth. Spores are yellow with a granular-papillose surface. The elaters are yellowish, often branches, and varying in size and form. The slender green capsules, when produced in large numbers, resemble grass tufts. Mature spores are necessary for species determination.[3]
The cytology of P. laevis has been subject to considerable study.[4] In 1909, Lotsy reported that the plant contained one chloroplast in each cell of the gametophyte and two in each cell of the sporophyte.[5] The sporophyte is likened to an elongated spindle.[2] Research conducted by Lorbeer in 1924 revealed that two plastids are present in a cell when it is undergoing cell division, of which according to McAllister may vary in size.[5] The centrosomes of the species, much like Marchantia polymorpha, are composed of two centrioles apposed end-to end, which are connected by a continuation of their cartwheel structures.[6]
Phaeoceros laevis, the smooth hornwort, is a species of hornwort of the genus Phaeoceros. It is commonly found in areas where moisture is plentiful, such as moist soils in fields, the banks of streams and rivers or inundated beneath the surface of the rivers. It grows to a maximum height of about 5 millimetres and the plants are monoecious; the sex organs are visible on the dorsal surface.
The thallus is nearly flat on the upper surface. It is of dark green and somewhat lustrous color, devoid of intercellular spaces. Its capsule is commonly 6 inches (150 mm) to 18 inches (460 mm) in length. The base is surrounded by a cylindrical sheath that often flares at the mouth. Spores are yellow with a granular-papillose surface. The elaters are yellowish, often branches, and varying in size and form. The slender green capsules, when produced in large numbers, resemble grass tufts. Mature spores are necessary for species determination.
The cytology of P. laevis has been subject to considerable study. In 1909, Lotsy reported that the plant contained one chloroplast in each cell of the gametophyte and two in each cell of the sporophyte. The sporophyte is likened to an elongated spindle. Research conducted by Lorbeer in 1924 revealed that two plastids are present in a cell when it is undergoing cell division, of which according to McAllister may vary in size. The centrosomes of the species, much like Marchantia polymorpha, are composed of two centrioles apposed end-to end, which are connected by a continuation of their cartwheel structures.
Phaeoceros laevis (D). Illustration from the 1911 Encyclopædia Britannica
Glotnioji siūlvaisė (lot. Phaeoceros laevis) – Phaeoceros genties augalų rūšis.
Lietuvoje reta. Įrašyta į Lietuvos raudonąją knygą.
Phaeoceros laevis là một loài rêu trong họ Anthocerotaceae. Loài này được L. Prosk. mô tả khoa học đầu tiên năm 1951.[1]
Phaeoceros laevis là một loài rêu trong họ Anthocerotaceae. Loài này được L. Prosk. mô tả khoa học đầu tiên năm 1951.
ニワツノゴケ（Phaeoceros laevis）は、ツノゴケ綱に属する種の一つ。庭や畑などの土上に生育する種であるが[1]、湿った土壌の上や流れの澱んだ水たまり付近、川辺などに生育しており、さらには河川の底で浸水した状態でも生育していることもある[2]。
葉状体の表面は平たく、暗緑色。葉状体の長さは1-3cm、幅は3-5mm[1]。弾糸は2-4細胞からなり、屈曲する[1]。胞子は黄緑色で大きさ40μm。
本種については細胞生物学的な研究が多数行われている[3]。それによると、本種の各配偶体には1つずつ葉緑体を持ち、各胞子体には2つずつ葉緑体を持つ[4]。
同属のミヤケツノゴケなどと形態的に非常に類似する。ミヤケツノゴケは、葉状体の腹面に柄のある小さい瘤をもつことでニワツノゴケと区別できる[1]。
この項目は、植物に関連した書きかけの項目です。この項目を加筆・訂正などしてくださる協力者を求めています（プロジェクト:植物／Portal:植物）。 ニワツノゴケ（Phaeoceros laevis）は、ツノゴケ綱に属する種の一つ。庭や畑などの土上に生育する種であるが、湿った土壌の上や流れの澱んだ水たまり付近、川辺などに生育しており、さらには河川の底で浸水した状態でも生育していることもある。
.jpg){kind=small}
