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Lactifluus aurantioruber (McNabb) J.A. Cooper 2021

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Lactifluus aurantioruber (McNabb) J.A. Cooper, Persoonia 18 (2021)
Lactifluus aurantioruber (McNabb) J.A. Cooper 2021

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Present
New Zealand
Political Region

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(McNabb) J.A. Cooper
McNabb
J.A. Cooper
2021
18
ICN
species
Lactifluus aurantioruber

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aurantioruber

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gregarious under Nothofagus
Under (1) N. fusca. Nelson: Lewis Pass, l.ii.l970, C.M. Mulcock; T.C. and K.R. Mulcock; (2) N. fusca and N. menziesii. Nelson: Manila, 23.iii.l966, J.A, McRobb; 13.iv.l968, 14.iv.l968, 25.iv.l969, 27.iii.l970, R.F.R. McN; Springs Junction, 14.iv.l968, R.F.R. McN., (holotype, PDD 26381); Rahu Saddle, 23.iii.l966, R.F.R. McN.; (3) N. menziesii. Nelson: Karamea, Oparara, 9.i.l968, R.F.R. McN; Karamea, Umere, 4.i.l970, R.F.R. McN.; Otago: Secretary Island, 13.ii.l960, R.F.R. McN.; (4) N. solandri, Wellington: Tongariro National Park, Oturere Stream, 8.iv.l965, R.F.R. McN.; (5) N. truncata, Karamea, Granite Creek, 6.i.l970, B.J. Denton
pileus: 5,5- 10 cm diam., centrally depressed at maturity, dry, often finely rugulose near margins, pruinose-subvelutinate to velutinate-subtomentose under lens, azonate, brownish orange, sordid orange, or orange-red under wet conditions, paler when dry and then greyish-orange or with a white to greyish bloom. Cuticle as in type variety but filamentous elements to 150 µm long. lamellae: adnate to subdecurrent, subdistant, thick, simple or occasionally forked near stipe, to 8 mm deep, creamy white to pallid cream with pink tints, often discoloured with brownish spots where latex has dried; lamellulae present in 2-3 unequal series; latex viscid, white, unchanging on immediate exposure to air, drying brown. stipe: 2-5.5 cm long, ± equal or tapering basally, 1-3 cm diam., solid, dry, finely pruinose-subvelutinate under lens, ± concolorous with pileus or slightly paler, basal mycelium white; flesh pallid orange-yellow, unchanging. Cuticle as in type variety. spores: spore print white; spores as in type variety. hymenium: basidia, pleurocystidia, cheilocystidia and pseudocystidia as in type variety. hymenophoral trama: heteromerous in both proximal and distal halves of lamellae. context of pileus: pallid orange-yellow, unchanging, firm. taste: lamellae mild to faintly acrid, context mild. chemical characters: formalin - n.r.; phenol - slowly deep reddish brown; FeSO4 - faint greyish green; guaiacol - salmon pink darkening to orange-red; KOH on pileus - darkening; on context - n.r.; NH4OH on pileus - darkening slightly; on context - n.r
Pileus centraliter depressus, 5.5-10 cm diam., siccus, levis vel subtiliter rugosus, azonatus, brunneo-aurantiacus vel sordide flammeus. Lamellae subdecurrentes, ad 8 mm altae, pallide aurantiacae cum rosello tinctu; lamellulae adsunt; latex viscidus, albus. Stipes 2-5.5 cm longus, plus minusve aequalis, 1-3 cm diam., solidus, siccus, plus minusve concolor cum pileo. Sporae amyloides, late ellipticae, 7.5-10.2 x 5.8-8.2 µm, verrucosae.

A degree of taxonomic significance can be attached to the mycorrhizal associations of Lactarius clarkei for the forms associated with the two major ectotroph genera show small differences and are worthy of recognition as distinct varieties. Apart from length of cuticular hairs, var. aurantiorubra is microscopically indistinguishable from var. clarkei, and it is often difficult to separate dried specimens of the two varieties. In the field, however, var. aurantiorubra can be recognised by the more orange, pruinose to subtomentose pileus, pinkish tinted lamellae, pallid orange-yellow flesh, and its association with Nothofagus.

holotype, PDD 26381

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Lactifluus aurantioruber (McNabb) J.A. Cooper 2021
New Zealand
Buller
Lactifluus aurantioruber (McNabb) J.A. Cooper 2021
New Zealand
North Canterbury
Lactifluus aurantioruber (McNabb) J.A. Cooper 2021
New Zealand
Otago Lakes
Lactifluus aurantioruber (McNabb) J.A. Cooper 2021
New Zealand
Taupo
Lactifluus aurantioruber (McNabb) J.A. Cooper 2021
New Zealand
Wellington
Lactifluus aurantioruber (McNabb) J.A. Cooper 2021
New Zealand
Westland

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c6e310d6-5a59-41c2-9b1d-9ce3b20e32ed
scientific name
Names_Fungi
11 July 2014
18 October 2022
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