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Geml, J.; Laursen, G.A.; Nusbaum, H.C.; Taylor, D.L. 2007: Two new species of Agaricus from the Subantarctic. Mycotaxon 100: 193-208.

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Geml, J.; Laursen, G.A.; Nusbaum, H.C.; Taylor, D.L. 2007: Two new species of Agaricus from the Subantarctic. Mycotaxon 100: 193-208.
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Pileus 30-50 mm diam, convex to plano-convex, surface dry, tan (5A2, orange white) with appressed, clay or mustard brown (5D5, 5E6) fibrils, margin with veil remnants. Lamellae 4.5 mm broad, pinkish to pale grayish brown (5C3, 5D4,5D5) at first, later dark brown (5E4,5E5), free, crowded, unequal in length, thin. Stipe 40-60 mm long, 8-11 mm thick, whitish with yellow-brown fibrils (3A6, 3A7, 4A6, 4A7), base swollen, tapering toward the pileus, dry, context hollow, white, turning a marbled yellow, tan or grey. Odor and taste: almond. Partial veil white forming an inferior, membrane-like annulus, evanescent in age. Chemical reactions: pileus context and surface yellowing in 5% KOH; Schaeffer reaction positive. Microscopical characteristics: Basidiospores short to medium-elliptical, sometimes elongated, yellow to reddish-brown, wall smooth, thick, entire, apiculate, one- or two-guttulate, dark brown at maturity, (6-) 7-8.8 (-10) x 4-4.5 (-4.8) um, mean and standard deviation are: L 7.61+1.03, W 4.34±0.34; Q=1.69 ± 0.22. Basidia: 2-4-spored, (20.2-) 21.1-24.6 x (6.6-) 7.0 um, clavate. Subhymenium of irregular, swollen, inamyloid cells. Pileipellis of interwoven, inamyloid, cylindrical hyphae, terminal cells cylindrical to slightly swollen tipped. Pileus context of interwoven, inamyloid, cylindrical hyphae. Lamellar trama of parallel to interwoven, inamyloid hyphae. Habitat — On litter, under Dracophyllum scoparium, D. longifolium, and Polystichum vestitum in the subalpine and alpine zones. Collections examined: NEW ZEALAND. CAMPBELL ISLAND: PERSEVERENCE HARBOUR, TUCKER COVE (S52 0 33.1', E169° 9.3') PDD92093 (Holotype), GAL9420 (Isotype), 9 March 2000, coll. G. A. Laursen; same location GAL9379, 6 March 2000, coll. G. A. Laursen. NEW ZEALAND . CAMPBELL ISLAND: PERSEVERENCE HARBOUR, MOUNT HONEY (S52 0 33.5', E169 ° 8.9') GAL9573, GAL9603, 1 4 March 2000 , coll. G. A. Laursen. NEW ZEALAND . CAMPBELL ISLAND: PERSEVERENCE HARBOUR, MOUNT BEEMAN (S52 0 33.7', E 1 6 9 ° 9.2') GAL9605, GAL9633, GAL9649, 1 5 March 2000 , coll. G. A. Laursen. Specimens deposited in ALA.
Pileus 40-130 mm diam, convex to plano-convex, surface yellow white (4A2) to cream or chamois (4A3, 4B4, 4C5) at first, later topaz or honey yellow (5C5, 5D6, 5E7). Disc and fibrillose squamules cream to grayish tan at first, later reddish brown (5D5, 5E6), margin with veil remnants. Lamellae 4-15 mm broad, pinkish to orange brown and pale grayish brown (5B2,5C3,5D4) at first, later dark brown (5E4,5E5,5F6), free, crowded, unequal in length, brittle. Stipe 40-90 mm long, 8-20 mm thick, white or dull yellow, base bulbous (25-35 mm thick), smooth, context hollow, white, turning yellow. Odor and taste: almond. Partial veil white forming an inferior, membrane-like, annulus, evanescent in age. Chemical reactions: pileus context and surface yellowing in 5% KOH; Schaeffer reaction positive. Microscopical characteristics: Basidiospores short to medium-elliptical, yellow to reddish-brown; wall smooth, thick, entire, apiculate, chocolate brown to purple brown in deposit, one- or two-guttulate, exhibit great variation in size within specimen, (4-) 7-9 (-9.5) x (4-)4.5-5.5 um, mean and standard deviation are: 7.89±1.11 x 4.83±0.38; Q=1.69 ± 0.15. Basidia: mostly 4-spored, 8.8 x 17.6 um, clavate. subhymenium of irregular, swollen, inamyloid cells. Pileipellis of interwoven, inamyloid, cylindrical hyphae, terminal cells cylindrical to slightly swollen tipped. Pileus context of interwoven, inamyloid, cylindrical hyphae. Lamellar trama of parallel to interwoven, inamyloid hyphae. Habitat — On litter, under Dracophyllum scoparium and D. longifolium in the subalpine zone of subantarctic islands.

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14 September 2015
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