Dossinia marmorata
| Dossinia marmorata | ||||||||||||
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Dossinia marmorata , section of the inflorescence |
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| Dossinia | ||||||||||||
| E. Morren | ||||||||||||
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| Dossinia marmorata | ||||||||||||
| E. Morren |
The orchid Dossinia marmorata is the only species in the genus Dossinia . The small, herbaceous plants come from Borneo .
description
Dossinia marmorata has a creeping rhizome with few internodes . The above-ground shoots are covered with a few leaves . The leaf blade is elliptical, at the base it narrows to a short petiole that surrounds the shoot tubular. The leaves have a contrasting, reticulated veining on a dark green background, which is silvery to golden in color.
The terminal inflorescence is unbranched, the inflorescence axis, bracts , ovary and the outside of the sepals are hairy. On peduncle are some bracts , the bracts of the flowers are about as long as pedicel and ovary together. The ovary is twisted, the flowers are resupinated . The three outer petals (sepals) are not fused together, they are similar to each other, but the lateral sepals have an asymmetrical base. The lateral inner petals ( petals ) are narrower and stick with the edge to the upper sepal. The lip is structured from the base to the tip as follows: The base ( hypochil ) is shaped like a bowl or sack, with two lateral, fleshy appendages inside. In addition, the lip at the base forms two lateral lobes that end bluntly and point inward into the sac-like hypochil. The middle part of the lip, the mesochil , is short and narrows towards the front. Its sides are bent upwards so that a U-shaped cross-section results. The edges of the lip are fleshy thickened here, this thickening continues a little further on the outside of the hypochil. The mesochil is also provided with two hairy warty ridges. The front part of the lip is bilobed, with each lobe approximately square in shape. The slightly curved column is twisted somewhat asymmetrically. In addition to the fertile part, the scar has two sterile scar flaps, each with a triangular wing. The stamen is oval in outline with an attached, S-shaped curved tip. It contains two pollinia , each connected to the common, oval adhesive disc ( Viscidium ) via a small stalk . The separating tissue between the stigma and the stamen ( rostellum ) has two teeth. The capsule fruit is spindle-shaped.
distribution
Dossinia marmorata is widespread in the northern half of Borneo at altitudes of up to 400 meters. It grows in the shade of evergreen rainforests. They can be found in crevices and hollows in the limestone that are filled with decomposed leaf litter .
use
Dossinia marmorata has been used as an ornamental plant since the middle of the 19th century because of its high-contrast leaves . When cultivated, the plants need a shady, humid location. The substrate must be permeable and evenly moist. In summer the temperature should not fall below 24 ° C and not rise above 28 ° C, in winter, when the plants are growing less, the temperatures should be between 15 and 24 ° C.
Historically, Dossinia marmorata is important because it was one of the first crosses of two different orchids: John Dominy crossed Ludisia discolor and Dossinia marmorata , the plants were presented by the Veitch nursery as Goodyera Dominyi in 1861 . Since the two species involved are now classified as belonging to different genera, this is the first artificially produced hybrid of two different orchid genera.
Botanical history
The species was first described in 1848 by Charles Jacques Édouard Morren . The generic name Dossinia honors the Belgian pharmacist and botanist Pierre Etienne Dossin (1777-1852). The genus Macodes is closely related to Dossinia .
See also
Individual evidence
- ↑ a b c d e Alec M. Pridgeon, Phillip Cribb, Mark W. Chase, Finn Rasmussen (eds.): Genera Orchidacearum. tape 3 : Orchidoideae , Part 2: Vanilloideae . Oxford University Press, New York / Oxford 2003, ISBN 0-19-850711-9 , pp. 85-87 .
- ↑ Jürgen Röth: Orchids. P. 216. VEB Deutscher Landwirtschaftsverlag, Berlin 1983.
- ↑ Rafaël Govaerts (ed.): Dossinia marmorata. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew .
