Hidden Spider Orchid

Botanical name: Corybas cryptanthus
Synonyms: Corybas saprophyticus, Corysanthes cryptantha, Molloybas cryptanthus
Common name(s): Hidden Spider Orchid, Icky

About:
Hidden spider orchid is one of New Zealand’s most extraordinary native orchids. Unlike most plants, it lacks chlorophyll and lives entirely beneath the forest floor, obtaining its nutrients through specialised fungal associations. Its translucent flower is usually hidden beneath deep leaf litter and the species is most often discovered only when its tall fruiting stem emerges above the forest floor.

Natural habitat:
Deep, partially decomposed leaf litter in coastal to montane forests and dense shrublands, particularly beneath kānuka and southern beech forests.

Growing environment:
Requires cool, permanently moist, humus-rich soils in dense shade with deep, undisturbed leaf litter. Completely dependent on specialised fungal relationships for survival.

Endemic distribution:
Endemic to New Zealand. Found on the Three Kings Islands, North Island and South Island.

Height:
Flowers hidden beneath the litter; fruiting stems up to 280 mm tall.

Width:
Up to 15 mm

Flowering:
June–October

Fruiting:
October–April

Uses:
• Native forest conservation
• Orchid conservation programmes
• Botanical research
• Woodland biodiversity monitoring

Appearance:
Growth habit:
A tiny subterranean, saprophytic orchid with branching horizontal rhizomes and almost no visible above-ground growth. The plant lacks chlorophyll and remains hidden beneath deep leaf litter for most of its life.

Leaves:
Leaves are reduced to minute triangular scales spaced along the underground rhizome. They contain no chlorophyll and are translucent white, often flecked with red, purple or brown.

Flowers:
A single translucent flower is produced, usually remaining buried beneath the leaf litter. The flower is white to pale pink with red or purple streaking. Long thread-like lateral sepals often project above the litter, while the elaborately fringed labellum has coarse branched lobes giving the flower an unusual crystalline appearance.

Fruit:
Following flowering, the fruiting stem elongates dramatically, raising a translucent capsule up to 280 mm above the forest floor. The capsule is initially downturned before becoming horizontal or erect as it matures.

Ecology:
This orchid depends entirely on specialised mycorrhizal fungi for nutrition and may obtain nutrients indirectly from nearby forest trees through fungal networks. It frequently grows alongside Cheeseman’s spider orchid (Corybas cheesemanii) but differs by lacking green leaves and chlorophyll.

Associated habitats:
Kānuka forest, southern beech forest, mature native forest, dense shrublands and deep woodland leaf litter.

How to grow:
Virtually impossible to cultivate successfully. Plants should never be removed from the wild, as survival depends on intact fungal associations and undisturbed forest floor conditions.

Propagation:
Propagation is currently impractical outside specialist research and conservation programmes because of its complete dependence on specific mycorrhizal fungi.

Cultural use:
Although there are no known traditional uses, hidden spider orchid is a remarkable example of New Zealand’s specialised native forest flora and an important component of healthy woodland ecosystems.

Garden value:
Not suitable for cultivation but highly prized by botanists and native orchid enthusiasts. Its hidden lifestyle, ghostly translucent flowers and completely chlorophyll-free growth habit make it one of New Zealand’s most remarkable native orchids.