A hydroid is a type of vascular cell that occurs in certain bryophytes. In some mosses such as members of the Polytrichaceae family, hydroids form the innermost layer of cells in the stem. At maturity they are long, colourless, thin walled cells of small diameter, containing water but no living protoplasm. Collectively, hydroids function as a conducting tissue, known as the hydrome, transporting water and minerals drawn from the soil. They are surrounded by bundles of living cells known as leptoids which carry sugars and other nutrients in solution. The hydroids are analogous to the tracheids of vascular plants but there is no lignin present in the cell walls to provide structural support.
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| - Hydroid (botany) (en)
- Hydroid (pl)
- Hidroide (botânica) (pt)
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| - Hydroidy – komórki przystosowane do przewodzenia wody w rdzeniu gametoforów mchów. Wraz z leptoidami tworzą tkankę przewodzącą, niezbyt wydajną w swej funkcji (mchy korzystają nie tylko z wody pobieranej z podłoża, ale także absorbowaną z otoczenia całą powierzchnią). Hydroidy w dojrzałym stadium funkcjonalnym są komórkami martwymi, o dość dużym świetle, o zgrubiałych ścianach bocznych i skośnych, cienkich ścianach poprzecznych (oddzielających komórki położone nad sobą w gametoforze). (pl)
- Hidroides são células alongadas com paredes transversais inclinadas que são finas e altamente permeáveis a água, existentes em musgos verdadeiros pertencentes ao filo Bryophyta e à classe Bryidae. Os hidroides compõem o cordão central de tecido condutor visível nos Bryidae, denominado hadroma. Os hidroides são precursores de vasos condutores verdadeiros, tais como xilema e floema, em vegetais mais complexos, a partir das plantas vasculares. A presença de hidroides formando hadromas nos musgos permite que o gametófito de alguns deles alcancem comprimentos de até cinquenta centímetros. (pt)
- A hydroid is a type of vascular cell that occurs in certain bryophytes. In some mosses such as members of the Polytrichaceae family, hydroids form the innermost layer of cells in the stem. At maturity they are long, colourless, thin walled cells of small diameter, containing water but no living protoplasm. Collectively, hydroids function as a conducting tissue, known as the hydrome, transporting water and minerals drawn from the soil. They are surrounded by bundles of living cells known as leptoids which carry sugars and other nutrients in solution. The hydroids are analogous to the tracheids of vascular plants but there is no lignin present in the cell walls to provide structural support. (en)
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| - A hydroid is a type of vascular cell that occurs in certain bryophytes. In some mosses such as members of the Polytrichaceae family, hydroids form the innermost layer of cells in the stem. At maturity they are long, colourless, thin walled cells of small diameter, containing water but no living protoplasm. Collectively, hydroids function as a conducting tissue, known as the hydrome, transporting water and minerals drawn from the soil. They are surrounded by bundles of living cells known as leptoids which carry sugars and other nutrients in solution. The hydroids are analogous to the tracheids of vascular plants but there is no lignin present in the cell walls to provide structural support. Hydroids have been found in some fossilised plants from the Rhynie chert, including Aglaophyton, where they were initially mistaken for xylem tracheids. (en)
- Hydroidy – komórki przystosowane do przewodzenia wody w rdzeniu gametoforów mchów. Wraz z leptoidami tworzą tkankę przewodzącą, niezbyt wydajną w swej funkcji (mchy korzystają nie tylko z wody pobieranej z podłoża, ale także absorbowaną z otoczenia całą powierzchnią). Hydroidy w dojrzałym stadium funkcjonalnym są komórkami martwymi, o dość dużym świetle, o zgrubiałych ścianach bocznych i skośnych, cienkich ścianach poprzecznych (oddzielających komórki położone nad sobą w gametoforze). (pl)
- Hidroides são células alongadas com paredes transversais inclinadas que são finas e altamente permeáveis a água, existentes em musgos verdadeiros pertencentes ao filo Bryophyta e à classe Bryidae. Os hidroides compõem o cordão central de tecido condutor visível nos Bryidae, denominado hadroma. Os hidroides são precursores de vasos condutores verdadeiros, tais como xilema e floema, em vegetais mais complexos, a partir das plantas vasculares. A presença de hidroides formando hadromas nos musgos permite que o gametófito de alguns deles alcancem comprimentos de até cinquenta centímetros. (pt)
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