Cortinarius beeverorum

Cortinarius beeverorum produces fruiting bodies slightly above ground, usually found under leaf litter. They appear round-shaped to slightly flattened and have a diameter of 1 to 3 cm (0.4 to 1.2 in) across. It has a reduced and often absent stipe and columella. The outer layer of the fungus is gelatinous and smooth, sometimes slightly bumpy, with an outer skin of the fruiting body orange-red. Underneath, there is a brown layer, which might reveal itself as the fungus ages. Inside, the fungus has small chambers (locules) that become rust-brown in mature specimens, separated by white tissue. Under a microscope, its spores appear yellow-brown, almond- to oval-shaped, and measure on average 17×10 μm. The spores have a rough surface with bumps and ridges. Its basidia, the structures that produce spores, are 42–69 μm long and are usually club-shaped and carry four spores each.

Cortinarius beeverorum is ectomycorrhizal, typically associated with southern beech (Nothofagus). This fungus typically appears in autumn. Although it prefers southern beech forests, it has sometimes been found near tea trees (Leptospermum). It has been recorded 26 times across eight different locations, with an estimated range of about 196,000 km2 (76,000 sq mi) and an occupied area of roughly 76 km2 (29 sq mi). Its occurrence spans both the North and South Island.

The species is named in honor of Ross Beever, a mycologist, botanist, and plant pathologist who contributed to the research leading to the description of C. beeverorum. It also honours his wife, Jessica Eleanor Beever, a bryologist whose passion for botany has inspired generations of students to study and appreciate the natural world.