Corsia crenata
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Corsia crenata is a loose leaf green plant type from the family of Corsiaceae .
features
Like all species of the genus also has Corsia crenata the photosynthesis abandoned and therefore forms no chlorophyll more. Instead, it lives myco-heterotrophically on a fungus .
Corsia crenata is a perennial plant that only grows above ground during flowering. A cylindrical, slightly grooved stem up to 12 centimeters long sprouts from the rhizome . The five leaves are up to 14 millimeters long, pointed and three-veined, the two external nerves are branched. The bracts are the same as the leaves, but more lanceolate.
The upright single flowers are terminal and stand on flower stalks that are 8 centimeters long. Of the six petals (three tepals each in two petal circles) five are rhombic-lanceolate to lanceolate, blunt to the tip, 6 to 7.5 millimeters long and 1.3 to 2.2 millimeters wide, three-veined and smooth.
The top sixth, the so-called labellum , is spear-shaped to heart-shaped, rounded at the tip and greatly enlarged (around 7 millimeters long and 8 millimeters wide), its base is blunt heart-shaped. From the midrib, five branched side ribs descend on each side of the labellum. The callus is semicircular and thickened, above it there is a finely papillary, only faintly visible, irregular thickening from which as many thickened lobes as the labellum has lateral ribs emerge.
At the base, the labellum is directly fused with the approximately 0.5 millimeter long gynostemium . The free stamens are 1 millimeter long, the anthers 0.8 millimeters long. The stylus is 1.2 millimeters long.
Distribution area
Corsia crenata was only collected once in the western part of New Guinea in the Gauttier Mountains at an altitude of 500 m.
Systematics
Corsia crenata was first described by Johannes Jacobus Smith in 1914. It is placed in the sessilis section because 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