Solitary under Nothofagus

Under N. fusca and N. menziesii, Nelson: Manila, Lake Daniels Track, 15.iv.1968, R.F.R. McN., (isotype, PDD26531).

pileus: 7,5 cm diam., centrally depressed at maturity, slightly viscid under wet conditions, finely pruinose to subvelutinate under lens, azonate, smooth, pallid yellow to yellow, discoloured with darker yellowish brown patches; margins entire. Cuticle composed of erect, thin-walled, hyaline, septate, filamentous elements to 65 µm long, 4-6 µm diam., with yellowish brown contents in KOH, originating from a layer of compact, closely interwoven hyphae with a cellular appearance. lamellae: adnate to subdecurrent, moderately distant, thick, simple, to 7 mm deep, pallid cream with yellowish brown edges; lamellulae present in 2 unequal series; latex white, unchanging on exposure to air, drying pallid cream. stipe: 4.5 cm long, ± equal, 2.5 cm diam., slightly chambered at maturity, dry, finely pruinose to subvelutinate under lens, concolorous with pileus, whitish near base; flesh white, unchanging. Cuticle similar to that of pileus. spores: spore print not obtained; spores broadly elliptical to ovate-elliptical, obliquely apiculate, apiculus to 2-(3) µm long, 9-11.2 X 7.5-9 µm, ornamentation of fine to moderately coarse amyloid ridges to 0.7 µm high, forming an incomplete or almost complete reticulum; plage indistinct. hymenium: basidia hyaline, sub-clavate to clavate, 60-85 X 8-12 µm, 4-spored, sterigmata to 10 µm long; pleurocystidia and pseudocystidia not seen but numerous simple, septate, filamentous paraphyses present; cheilocystidia numerous, filamentous to cylindrical, hyaline, thin-walled, simple, aseptate or 1-septate, with brown contents in KOH, 50-68 X 2.5-5 µm. hymenophoral trama: homiomerous, composed of lactiferous hyphae and rather loosely interwoven connective hyphae; subhymenium of closely interwoven connective hyphae, appearing cellular in section. context of pileus: white, unchanging, thick, firm, rather coarsely granular. smell: not distinctive. taste: lamellae and context mild. chemical characters: formalin - n.r.; phenol - slowly deep vinaceous; FeSO4 - rapidly salmon pink; guaiacol - salmon pink darkening to brick red; KOH on pileus - darkening; on context - faint yellowing; NH4OH on pileus and context - n.r.

Pileus centraliter depressus, 7.5 cm diam., siccus, azonatus, levis, pallide flavus ad flavum. Lamellae subdecurrentes, ad 7 mm altae, pallide cremeae; lamellulae adsunt; latex viscidus, albus. Stipes 4.5 cm longus, plus minusve aequalis, 2.5 cm diam., in cavas partes divisus, siccus, concolor cum pileo, Sporae amyloides, late ellipticae, 9-11.2 x 7.5-9 µm, ornatae.

It is difficult to insert Lactarius maruiaensis into Singer's (1962) classification but it is possibly best placed in sect. Dulces. The species is readily recognisable by the pallid yellow pileus and stipe, and the reticulately ornamented spores.

isotype, PDD26531