Corsia cornuta
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| Corsia cornuta | ||||||||||||
| P.Royen |
Corsia cornuta is a loose leaf green plant type from the family of Corsiaceae .
features
Like all species of the genus also has Corsia cornuta the photosynthesis abandoned and therefore forms no chlorophyll more. Instead, it lives myco-heterotrophically on a mycorrhizal fungus that lives in symbiosis with another plant.
Corsia cornuta is a perennial plant that only grows above ground during flowering. From the short, creeping rhizome , up to 15 centimeters long, cylindrical and finely grooved, unbranched and upright stems sprout. The 8 to 12 millimeter long, oblong to ovate and tapering foliage is reduced to sheathed, five-veined scaly leaves ; the bracts are of the same shape.
The upright individual flowers are terminal and stand on flower stalks that are 20 to 25 millimeters long. Of the six petals (three tepals each in two petal circles ) five are obliquely egg-shaped, up to 4.5 millimeters long and 2.5 millimeters wide, one-nerved, hairless and sickle-shaped to tailed at the tip. The top sixth, the so-called labellum , is dark red and greatly enlarged at 15 millimeters in length. It initially surrounds the flower bud and, after opening, covers the other flower organs protectively. On approach is to Labellum on an elongated, slightly rounded and horned web of callus tissue on gynostemium grown ( "pinned"), there is a central rib traversed and on each side of 5 or 6 branched parallel nerves.
The gynostemium is 0.5 millimeters in length, the free fraction of the stamens reaches 1 millimeter length, the dust bag are also 1 millimeter long, the stylus around 2 millimeters. The ovary is 7 to 10 millimeters long.
Distribution area
Corsia cornuta is native to the western part of New Guinea at altitudes of 2590 meters on humus soils.
Systematics
Corsia cornuta was first described by Pieter van Royen in 1972, belongs to the Unguiculatis section and is closely related to Corsia unguiculata . The common feature is the horn-shaped extension on the callus bridge.
literature
Much of the information in this article has been obtained from the following sources:
- Pieter van Royen : Sertulum Papuanum 17. Corsiaceae of New Guinea and surrounding areas in: Webbia 27: 233-234, 1972