Type: Radicicolous Fungi; Description: Basidiomata pileate, centrally stipitate. Pileus 20–80 mm in diameter, light brown to umber, becoming dark brown to vinaceous tawny later, with dark brown to smoky black scales sprinkled thickly at centre and more sparsely towards the margin, convex at first, becoming plano-convex to irregularly depressed later, dry; flesh firm, ivory, sometimes with a pinkish tinge. Gills sinuate to sub-decurrent, moderately crowded, vinaceous buff to russet to fawn. Stipe tapering towards a sub-bulbous base, buff to fawn in the upper third, sepia or cigar brown further down, fibrillose, solid, 30–70 mm long. Basidiospores broadly ellipsoid to ovoid, 6–9 × 4–6 μm, non-amyloid; spore print white.

Distribution: Buller, Westland.; 1st Record: Kile & Watling (1983).

Significance: Recorded only from Nothofagus forests of the north west coast of the South Island. Studies using molecular techniques (Coetzee et al. 2001) have shown that A. hinnulea is more closely related to Armillaria spp. occurring in the Northern Hemisphere than to other Australian and New Zealand species. Armillaria hinnulea also occurs in the mixed forest and wet sclerophyll eucalypt forest of south-eastern Australia where hosts include Acacia melanoxylon, Eucalyptus regnans, and Nothofagus cunninghamii.; Host(s): Nothofagus solandri var. cliffortioides, Nothofagus sp.