用戶:Shuizetinglan/Fleshy tree orchid
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本用戶頁由Shuizetinglan(貢獻·日誌)於4個月前最後編輯。 | ![]() |
此處改為條目主題是一個 Fleshy tree orchid
Description
編輯The plant morphology of Drymoanthus adversus resembles a small cluster of Spider plants with a diameter of approximately 4-12- (15) centimeters, but its leaves are more juicy and thick, and the number of leaves is sparse, with very loose spacing between them, resembling a mini version of Moth Orchids. Its leaves are thick dark green with occasional purple spots. The leaves are always elliptical or round in shape, with sharp tips at the end. The pages are divided in half by a deep vein, and the overall shape of the leaves is not flat, but slightly twisted. Its leaf arrangement is alternate, with the overall leaves appearing in a "V" shape. The base of the leaves is connected to the leaf sheath along a clearly defined abscission line, and the old leaves are slightly drooping. The stem of D.adversus is very short, usually only 5 cm long, and a fleshy aerial root fixed plant will grow on the old stem that has fallen off the leaves. Its root color is emerald green to grayish white, and the aerial roots can grow very long. The root system is mostly radiating and closely attached to the bark. The inflorescence of D.adversus grow opposite to the tip of the plant, often drooping down into a raceme, which is 80 millimeters long, with (1-) 6 (-20) flowers. The flowers are green or greenish white, dotted with flowers. Red, chestnut, or purple in color (de Lange et al. 2007). Sepals and petals are nearly equal in length, about 3.5 * 1.5 millimeters. Lips are almost equal in length and wider, very fleshy, ± upright, with a smooth convex outer surface and deep grooves. The middle lobe is free and only serves as a small cup-shaped tip (Moore and Edgar, 1970). Successful pollination results in a solid elliptical shape with parallel grooves on the surface and dark purple dots accompanying it.
Global range
編輯Only found in New Zealand ,it is native plant.Through observation on the iNaturalist chart, it has been found that Drymoanthus adversus is widely distributed in New Zealand, ranging from the southernmost Stewart Island to the northernmost Motukokako Island/Piercy Island. Even Chatham Island, a small island far from New Zealand, and its surrounding coastal areas and mountainous highlands are distributed, which is incredible. In the North Island, it is mainly distributed in the southernmost and northernmost peninsula, but its distribution has not been found in various small areas centered around National Park, Waipukurau, and Blairlogie. On the South Island, it is mainly distributed along the west coast, mountains and forests from north to south, while on the east coast, the Canterbury Plain is hardly distributed, but a small number of individuals have been observed in Maungati and Dunedin.
Habitat
編輯Drymoanthus adversus often grows in moist forests near rivers or oceans, and chooses tree trunks and branches on ridges shrouded in thin mist or clouds as habitats (Molloy, 1994). The host of Drymoanthus adversus has strong diversity, and we can find it on various plant surfaces, including the vine Metrosideros fulgens, shrub Lophomyrtus obcordata, and tree fern Dicksonia squarosa. According to Cox&Lehnebach's observation D The number of adventius increases with the increase of host surface area. Drymoanthus adversus does not tend to favor specific host species, but rather tends to favor the size of the host, most commonly found on larger trees. D. adversus often grows together with moss lichens on tree trunks, and almost 90% of them come into direct contact with these non vascular epiphytic plants. Moss also serve as a substrate for orchids to provide moisture, but the lowest proportion of orchids growing in contact with each other is on the shrub O.paniculata. Orchid roots typically grow in Pseudocellularia lichens (2014).
Life cycle
編輯Orchids are a very unique plant, each with its own unique habitat. They have very little compatibility with their living environment, and their pollination and life cycle are often difficult to understand. Drymoanthus adversus blooms from September to January, and after successful pollination, it will bloom from November to May. The fruit forms from late December to January and matures slowly. Around July, the fruit completely ripens and begins to release seeds. At this time, new racemes will gradually develop and mature in preparation for the next pollination. The release of D. adversus seeds lasts for a long period of time and is assisted by the siphoning effect of the fluff inside the fruit shell (Molloy, 1994). Orchid seeds are very small, and by discarding the cotyledons or endosperm that should have provided nutrients for germination in the seeds and compressing the embryo into small cell clusters without embryonic roots or buds, the cost of seed production is reduced, thereby increasing yield (Dillon & Lehnebach, 2023). This allows a large amount of dusty orchid seeds to spread far away with the wind (Thorsen et al., 2009). Perhaps due to the fact that orchid seeds must combine with fungi (possibly multiple fungi or specific fungi) to form symbiotic bodies for germination and development, most seeds will fall off near the parent plant, resulting in a higher survival rate. Many seedlings can be observed to be below the horizontal direction of the branches (Molloy, 1994).
Habit
編輯Like most epiphytic orchids, Drymanthus adversus requires an environment with high air humidity and sufficient sunlight, but in addition to the physical environment, the environment provided by organisms cannot be ignored. One of the main physiological characteristics of epiphytic orchids is that they adhere to the surface of other plant stems for survival without stealing host nutrients. Therefore, the outer epidermis of the host is an important environmental factor for epiphytic orchids. The texture of the bark, the age of the host, and chemical substances in the bark that may affect seed germination can all affect their distribution and abundance (Benzing 1979). However, for Drymanthus adversus, it is not so picky about its host. It can inhabit various tree trunks, and its roots are found intertwined with moss in multiple habitats. Crain (2012) hypothesized that moss, as a living substrate for orchids, can provide water for epiphytic orchids and support fungal growth. Fungi are crucial for the germination of orchid seeds, and the habitat preference of orchid mycorrhizal fungi adds another level of complexity to the interaction between orchids and hosts (Gowland et al., 2011). Orchid seeds and fungi are beneficial for both parties. Orchids provide fungi with sugar, B vitamins, and a safe house, while fungi provide water, minerals, and more than 80% of the plant's carbon needs. Perhaps it is because lichen is a symbiotic body of algae and fungi, similar to mosses, that lichen also helps establish orchid seeds (Callaway et al, 2001).
Potential hazards
編輯Natural disease factors
編輯In terms of protection, Drymanthus adversus is classified as not threatened, which means it currently does not face intrusion from predictors, parasites, and diseases. With the increase of vascular bundle epiphyte species on the host, the incidence rate of Dryoanthus aversus decreases and remains at a low level (Cox&Lehnebach, 2014). It is worth considering that Austropuccinia psidii (G. Winter) Beenken is a disease that spreads rapidly and widely. If the plant host of Myrsinaceae is seriously infected, the developing spots may lead to the deformation of leaves and branches, and the death of branches. (Zimmer et al, 2023). In this case, if the host tree attached to Drymanthus adversus is infected with this disease, it will face the risk of losing its habitat.
Anthropogenic factor
編輯Drymanthus adversis may have ornamental value as a horticultural plant, by tying it to wood with water moss and hanging it in a warm, shaded location to plant them. It is often watered until new roots grow and stabilize itself. Orchid collectors pose a threat to rare local orchids, and the large-scale collection of orchids can lead to a decrease in species diversity in the original regions (Molly&St George, 1994)
參考資料
編輯de Lange, P.J.; Rolfe, J.; St. George, I.; Sawyer, J. 2007: Wild Orchids of the Lower North Island. Wellington, Department of Conservation Wellington Conservancy(Include the description of flower) Moore LB, Edgar E. 1970. Flora of New Zealand, Volume II. Indigenous Tracheophyta: Monocotyledones except Gramineae. Government Printer, Wellington, NZ. 354 p.DOI: 10.1080/0028825X.1971.10430240 (Specific data on plant organs) Nicholls, W. H. (1943). A new genus of Australian orchids. The Victorian Naturalist, Melbourne, 59, 173-175.(This name was created by Australian amateur botanist William Henry Nicholls (1885-1951) in 1943, referring to the preferred habitat of this genus.) Molloy, B.P.J.; St.George, I. M. 1994: A new species of Drymoanthus (Orchidaceae) from New Zealand, and typification of D. adversus. New Zealand Journal of Botany 32: 415–421.(Provide the information of its habitat) Benzing, D.H. 1979: Alternative interpretations for the evidence that certain orchids and bromeliads act as shoot parasites. Selbyana 5: 135–144(The effect of attachment matrix on epiphytic orchids) Cox, B., & Lehnebach, C. A. (2014) .Habitat preferences of two New Zealand perching orchids with contrasting abundance and conservation status.Wellington Botanical Society Bulletin.55.11.70-83(On site investigation, statistical research, distribution, habitat environment, and other organisms) Molloy, B.P.J.; St. George, I. 1994: A new species of Drymoanthus (Orchidaceae) from New Zealand, and typification of D. adversus. New Zealand Journal of Botany 32: 415–421.(Basic information on the habitat of this plant) Callaway, R.M, Reinhart, K.O., Tucker, S.C.; Pennings, S.C. 2001: Effects of epiphytic lichens on host preference of the vascular epiphyte Tillandsia usneoides. Oikos 94: 433–441. (Lichens may help orchids sprout) Crain, B.J. 2012: On the Relationship between bryophyte cover and the distribution of Lepanthes spp. Lankesteriana 12: 19–52(Assuming Orchid Sprouting and Habitat Moss) Thorsen MJ, Dickinson KJM, Seddon PJ. 2009. Seed dispersal systems in the New Zealand flora. Perspectives in Plant Ecology, Evolution and Systematics 11: 285–309. https://doi.org/10.1016/j.ppees.2009.06.001.(Transportation method for orchid seeds) Joe Dillon & Carlos Lehnebach.(24 Jan 2023).Summer scholar turns the spotlight on native tree-perching orchids.https://blog.tepapa.govt.nz/2023/01/24/summer-scholar-turns-the-spotlight-on-native-tree-perching-orchids/?cn-reloaded=1(The uniqueness of orchid seeds) Gowland, K.M., Woord, J., Clements, M.A., Nicotra, A.B. 2011: Significant phorophyte (substrate) bias is not explained by fitness benefits in three epiphytic orchid species. American Journal of Botany 98: 197–206(Lichens may help orchids) Zimmer, H., Clements, M., Cooper, E., Jones, D., Makinson, R., Nargar, K., & Stevenson, K. (2023). Collateral damage: epiphytic orchids at risk from myrtle rust. Australian journal of botany. botany.https://doi.org/10.1071/BT23047(Potential diseases that can affect the plant)