Effectively published 26/02/2019 09:57:32  (ISSN 2049-2375)

Nomenclatural novelties : Glen Dierickx, Marie Froyen, Roy Halling, Komsit Wisitrassameewong, Lynn Delgat, Eske De Crop & Annemieke Verbeken

Lactifluus caliendrifer Froyen & De Crop, sp.nov.
    IF829914
Basidiocarps small (up to 3.5 cm cap diam.) and turning brown when bruised. Cap very velvety to tomentose, white to cream-coloured. Stipe smooth to velvety, white. Context with smell fruity, strong. Latex copious, watery white to white, sticky, turning dark yellow to mustard brown; taste acrid and a bit bitter. Basidiospores broadly ellipsoid, (5.8) 5.9–7.0–7.1–7.9 × (4.5) 4.7–5.6–5.7–6.2 µm (n=40, Q = 1.12–1.24–1.41); ornamented with irregular and isolated warts which are up to 1 µm high. True pleurocystidia absent, but with sterile elements in the hymenium. Pileipellis a palisade to lampropalisade. L. caliendrifer differs from its sister species, L. russulisporus, by the abundant thick-walled marginal cells, very long pileipellis hairs and slightly smaller basidia and spores with more regular and lower warts.
    Holotype GENT, Wisitrassameewong 378.
Collection details: THAILAND. Doi Pui, Chiang Rai, alt. 650 m, N19°49'26''E99°52'19'', bamboo forest, 3 July 2012, Wisitrassameewong 378 (isotypus MFLU). GenBank no. MK517655

Lactifluus russulisporus Dierickx & De Crop, sp.nov.
    IF829913
Basidiocarps small (up to 4 cm cap diam.). Cap and stipe dry, matt, yellowish white to pale brown. Context with unpleasant, fishy smell. Latex copious, watery white, staining tissues brown. Basidiospores broadly ellipsoid 7.0–7.8-7.9–8.7 × 5.7–6.4-6.5–7 µm (n=40, Q = 1.14–1.23–1.40); ornamented with irregular and isolated warts which are up to 1.3 µm high. True pleurocystidia absent, but with few to abundant sterile elements in the hymenium. Pileipellis a lampropalisade. L. russulisporus differs from its sister species, L. caliendrifer, by its longer basidia, slightly bigger spores with a somewhat heavier and more irregular ornamentation and the absence of abundant thick-walled marginal cells.
    Holotype BRI, Halling 9398.
Collection details: AUSTRALIA. Queensland: Fraser Island, Wanggoolba Creek Road, West of Central Station, alt. 90m, S25°28’ E153°2’, gregarious on sand with Leptospermum, Syncarpia, Eucalyptus pilularis and Eucalyptus microcorys, 27 May 2010, R. E. Halling, N. Fechner and M. Castellano, R.E.H. 9398 (isotypus NY). GenBank no. KR364097