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Posted on 12:29 PM by Wanto and filed under
By John Bernard
Many orchids produce pseudobulbs or false bulbs, although this is not always the case. Those that do, develop a svmpodial type of growth, where a new pseudobulb is added each season along a continually extending rhizome. In this way, the plant builds up a series of pseudobulbs that form a chain.
The chain may divide when two or more growths develop from the last pseudobulb in one year. This is how large clumps can form over several years. It is difficult to make comparisons with other structures and plants. A pseudobulb is unlike a daffodil or an onion bulb, which consists of a layer of sheafs, or false leaf bases, one on top of the other. It is also unlike a potato, which is a starchy, tuberous structure.
While the vandas can become considerably tall, and at some stage in their life need to be reduced in height, the phalaenopsis are selfregulating, never attaining much upward growth, because the older leaves are shed at the same rate as new ones appear. The leaves of vandas and other monopodial orchids are semi-rigid, while those of phalaenopsis are broad and flat. In the wild, the latter plants are not subjected to extreme temperatures or bright sunlight, and their wide surface is designed to catch as much of the filtered light as possible.
Some vandas, on the other hand, have rounded, or terete, foliage, which lessens the surface area on plants that can survive in areas of full sun. Leaves that remain for one or two seasons only are wide, soft and papery, such as with the lycastes, while leaves that are hard and leathery will live for much longer.
The leaves contain chlorophyll, which enables the plant to photosynthesize sunlight into energy. Some of the terrestrial orchids exist for long periods without leaves, producing foliage for only a short time during the growing season. A few orchids, such as Rhizanthella species, are subterranean, without any green parts, relying entirely on the microscopic fungus with which they form a symbiotic relationship. The nutrients that the orchid requires are provided by the fungus.
Some leafless monopodial orchids exist, such as Chilochista species, that are no more than a cluster of roots, and it is the roots that contain the chlorophyll to enable the plants to photosynthesize. A few orchids have thick hairs on both sides of the foliage.
A few orhids, such as gongoras and other species, produce short side roots at angle from the main ones. blur are produced near the base of the sameamid become hard and as sharp as des as they mature.
Some orchids, such as Trichotosia ferox, produce plants covered with fine, brown hair, the purpose of which is not fully understood. It is thought that the hairs may provide a layer of protection in cold climates. The stems, new shoots and base of the flower buds of Dendrobium infundibulum are covered with thick, black hairs, creating a rough surface. As the new growth starts to age, the hairs become less apparent.
The chain may divide when two or more growths develop from the last pseudobulb in one year. This is how large clumps can form over several years. It is difficult to make comparisons with other structures and plants. A pseudobulb is unlike a daffodil or an onion bulb, which consists of a layer of sheafs, or false leaf bases, one on top of the other. It is also unlike a potato, which is a starchy, tuberous structure.
While the vandas can become considerably tall, and at some stage in their life need to be reduced in height, the phalaenopsis are selfregulating, never attaining much upward growth, because the older leaves are shed at the same rate as new ones appear. The leaves of vandas and other monopodial orchids are semi-rigid, while those of phalaenopsis are broad and flat. In the wild, the latter plants are not subjected to extreme temperatures or bright sunlight, and their wide surface is designed to catch as much of the filtered light as possible.
Some vandas, on the other hand, have rounded, or terete, foliage, which lessens the surface area on plants that can survive in areas of full sun. Leaves that remain for one or two seasons only are wide, soft and papery, such as with the lycastes, while leaves that are hard and leathery will live for much longer.
The leaves contain chlorophyll, which enables the plant to photosynthesize sunlight into energy. Some of the terrestrial orchids exist for long periods without leaves, producing foliage for only a short time during the growing season. A few orchids, such as Rhizanthella species, are subterranean, without any green parts, relying entirely on the microscopic fungus with which they form a symbiotic relationship. The nutrients that the orchid requires are provided by the fungus.
Some leafless monopodial orchids exist, such as Chilochista species, that are no more than a cluster of roots, and it is the roots that contain the chlorophyll to enable the plants to photosynthesize. A few orchids have thick hairs on both sides of the foliage.
A few orhids, such as gongoras and other species, produce short side roots at angle from the main ones. blur are produced near the base of the sameamid become hard and as sharp as des as they mature.
Some orchids, such as Trichotosia ferox, produce plants covered with fine, brown hair, the purpose of which is not fully understood. It is thought that the hairs may provide a layer of protection in cold climates. The stems, new shoots and base of the flower buds of Dendrobium infundibulum are covered with thick, black hairs, creating a rough surface. As the new growth starts to age, the hairs become less apparent.
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