Under (1) L. ericoides, Auckland: Titirangi, Bishop's Reserve, 26.xii.l966, 6.xi.l967„ 8.m.l967 (2 coils), R. F. R. McN. (PDD 26615, 26549, 26643, 26644). Titirangi, Atkinson Park, 6.ii.l967, R, F. R. McN. (PDD 26622); 13.xi.l967, R. F. R. McN. (holotype PDD 26628); l.iii.l967, 13.iii.l967, 4.iv.l967, 24.V.1967, R. F. R. McN. (pdd 26638, 26650, 26946. 26613). (2) Leptospermum sp. Auckland: Titirangi, Atkinson Park, 15.iv.l970, J. B. Taylor (PDD 29398).

pileus: 5-10.5 cm diam., hemispherical to convex when young, centrally depressed to shallow-infundibuliform at maturity, viscid, early creviced with areolate patches crowded in centre and becoming less numerous and scattered towards margins, ground colour dull green, greyish green, or pallid olive, often tinged with greyish red under dry conditions, areolae pallid greyish green, margins often radially split at maturity, thin, slightly involute, non-pectinate or faintly pectinate under dry conditions in old specimens. Cuticle readily separable, 250-300 µm thick, consisting of distinct epicutis and sub-cutis; epicutis composed of erect, aseptate or septate, filamentous, ciliate, or papillate elements to 50 µm, long, arising from a layer of sphaerocysts 4-8 cells deep; sub-cutis heavily gelatinised composed of interwoven, thin-walled, septate hyphae 1.5-4 µm diam., repent or obliquely ascending, oleiferous hyphae occasionally present. lamellae: free to adnexed, crowded, moderately thick, simple or occasionally forked near stipe, to 7 mm deep, white to pallid creamy white, not discoloured at maturity, lamellulae rare. stipe: 2-7 cm long, ± equal, 1.2-2.8 cm diam., solid or chambered at maturity, dry, finely velutinate under lens, pallid smoke grey, pallid rose-grey, or pallid grey with faint purplish tints, rarely white; flesh white, unchanging on exposure to air. Cuticle composed of interwoven hyphae 2.5-4 ^m diam., terminal cells projecting obliquely or at right angles to surface. spores: spore print white; spores broadly elliptical, obliquely apiculate, apiculus to 1.5 µm, long, 7-9 X 6-7 µm, ornamentation of fine amyloid verrucae to 0.5-(0.8) µm, high, joined by fine to moderately fine amyloid ridges and forming an incomplete reticulum, or occasionally isolated: plage indistinct. hymenium: basidia clavate, hyaline, 35-53 X 6.5-11 µm, 4-spored, sterigmata to 6 µm long; pleurocystidia scattered, sparse, broadly fusiform or subclavate, hyaline, thin-walled, contents sparse, refractive in KOH, projecting to 20 µm, beyond basidia at times, apices acuminate, bluntly acuminate or capitulate, 63-87 X 7.5-14 µm, cheilo-cystidia sparse, similar to pleurocystidia but shorter, intermixed with numerous filamentous or subclavate, septate structures to 4 µm diam. hymenophoral trama: heteromerous, intermixed, numerous oleiferous hyphae present. context of pileus: white, unchanging; structure heteromerous, clamp connections absent. taste: lamellae and context mild, chemical characters: formalin on context—n.r.; phenol on context—slowly deep vinaceous; FeSO4 on context—rapidly salmon pink: guaiacol on stipe base—rapidly faint pink, finally pinkish red: KOH and NH4OH on pileus and context-—n.r.

Solitary or scattered under Leptospermum.

Pileus in forma brevis infundibuli 5-10.5 cm diam., griseoviridis, viscidus cum areolatis pannis; margines radialibus rimis fissi, non pectinati. Lamellae liberae ad adnexas ad 7 mm altae, pallide cremeo-albae; lamellulae rarae. Stipes 2-7 cm longus, plus minusve aequalis, 1.2-2.8 cm diam., solidus vel cavatus ad maturitatem, pallide roseogriseus. Sporae late ellipticae 7-9 x 6-7 µm, amyloides subtiliter ornatae.

The distinctive cuticular structure indicates that R. griseoviridis belongs in section Rigidae Fr. subsection Virescentinae Sing. as defined by Singer (1962). The epicutis of young fructifications soon ruptures forming areolate patches seated on the continuous subcutis. These epicuticular patches resemble velar remnants.

holotype PDD 26628