Corsia boridiensis
| Corsia boridiensis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Corsia boridiensis | ||||||||||||
| P.Royen |
Corsia boridiensis is a loose leaf green plant type from the family of Corsiaceae .
features
Like all species of the genus also has Corsia boridiensis the photosynthesis abandoned and therefore forms no chlorophyll more. Instead, it lives myco-heterotrophically on a fungus .
Corsia boridiensis is a perennial plant that only grows above ground during flowering. A cylindrical stem up to 25 centimeters long sprouts from the rhizome . The foliage is 10 to 18 millimeters long, pointed and five-nerved. The bracts are the same as the leaves.
The upright individual flowers are terminal, ocher-colored, tinged with purple and are on flower stalks that are 2.5 to 3 centimeters long, cylindrical and finely grooved. Of the six petals (three tepals each in two petal circles), five are irregularly oblique spear-shaped, blunt towards the tip, around 9 millimeters long and 2 millimeters wide, three or five nerved and smooth.
The top sixth, the so-called labellum , is heart-shaped, rounded at the tip and greatly enlarged (around 12 millimeters long and 10 millimeters wide), its base is heart-shaped. Seven side ribs descend from the center rib on each side. The callus is shield-like trapezoidal and has a narrow crest on each side, which merges into the shield at the highest point 3 millimeters long and wide and finely papillous , above it there is a finely papillous, only slightly visible thickening.
At the base, the labellum is directly fused with the approximately 0.5 millimeter long gynostemium . The free stamens are 1.5 millimeters long, the anthers 1 millimeter long. The style is scarlet and 1.5 to 2 millimeters long, the ovary like the brown capsule fruit 15 to 28 millimeters long.
Distribution area
Corsia boridiensis was collected in Boridi in New Guinea at an altitude of 1430 to 1520 m.
Systematics
Corsia boridiensis was first described by Pieter van Royen in 1972 and is particularly close to Corsia cyclopensis . Like this, it is placed in the sessilis section , since the labellum is directly fused with the gynostemium.
proof
- Pieter van Royen: Sertulum Papuanum 17. Corsiaceae of New Guinea and surrounding areas. In: Webbia. 27: 223-255, 1972