hides its web under the beech leaves
- Size
- Cap: 20-50 mm diam.
- Lifespan
- Unknown
- Diet
- Mycorrhizal, forming symbiotic relationships with southern beech trees. Exchanges nutrients.
- Habitat
- Under southern beech (Nothofagus) trees in native forest. Fruits in autumn groups.
- Range
- Endemic to New Zealand, common in South Island beech forests, particularly western regions.
- Endemism
- Native
- Main Threats
- Habitat disturbance from logging, fire, or heavy grazing disrupting mycelial networks.
- Population
- Common in undisturbed beech forests throughout the South Island. Widespread and abundant.
- Conservation Status
- Not Threatened
You are walking through a beech forest. The light is dim. Filtered through a canopy of small, hard leaves. The ground is covered in a thick mat of leaf litter. Brown and brittle. You are looking for colour. Most of what you find is decay. But there, near the base of a silver beech, is a splash of violet. Cortinarius rotundisporus is not large. It is modest. The cap is convex. Often with a slight umbo. Ranging from a deep violet to a duller brownish-purple as it ages. It is dry to the touch. Unlike the slimy waxcaps. Underneath, the gills are attached to the stem. Sharing the same violet hue. Though they darken to rusty brown as the spores mature. This colour change is not a flaw. It is the signature of the genus Cortinarius.
The stem is slender and fibrous. In young specimens, a delicate web of fibres—the cortina—stretches from the stem to the edge of the cap. Protecting the developing gills. As the cap expands, this web tears and disappears. Leaving only faint traces on the upper stem. It is a fleeting structure. Gone before most people notice it.
This fungus is mycorrhizal. It does not feed on dead matter. Instead, it forms a symbiotic relationship with the roots of southern beech trees. The fungal hyphae extend into the soil. Gathering water and nutrients that the tree cannot reach. In exchange, the tree provides sugars produced by photosynthesis. It is a quiet trade. Essential for the health of the forest. Without these fungi, the beech trees would struggle. The soil would be less fertile. The forest would be poorer.
Beech Webcaps are common in the South Island. Particularly in the wetter western forests. They fruit in autumn. Appearing in small groups or scattered singly. They are not edible. Like many cortinarious fungi, they contain toxins. Causing severe gastrointestinal distress. They are not deadly. But they are not food. They are best left alone.
Threats are minimal. The species is widespread and abundant in its preferred habitat. However, like all forest fungi, it is sensitive to disturbance. Logging, fire, or heavy grazing can disrupt the mycelial network beneath the soil. Once broken, these connections take years to rebuild. The fungi wait. The trees wait. It carries on.
Māori names for specific webcap species are not recorded in standard dictionaries. In a kaitiakitanga framework, these fungi represent the hidden connections of the forest. They link the trees to the soil. Facilitating the flow of life. Protecting them means protecting the integrity of the beech forest ecosystem. And the unseen networks that sustain it. The observation is respectful. The connection is vital.