Lactarius bisporus Verbeken &amp; F. Hampe 2014, sp. nov.
Creators: name: Verbeken, Annemieke
name: Hampe, Felix
name: Wissitrassameewong, Komsit
name: Hyde, Kevin
name: Eberhardt, Ursula
name: Nuytinck, Jorinde
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Russulales
Russulaceae
Lactarius
Lactarius bisporus

description: <i>Lactarius bisporus</i> Verbeken &amp; F. Hampe <i>sp. nov.</i> (Figs. 2–3) Mycobank number: MB 807217 <i>Diagnosis: Basidiomata 10–35 mm diam., 10–15 mm alta, subglobosa, subregularia. Peridium leviter velutinosum, ochraceum ad luteobrunneum. Stipes absens. Gleba labyrinthuloidea, albida, cum locis parvis, cum paucis venis gelatinosis. Columella absens. Latex excarsus, albidus, immutabilis. Sporae globosae ad subglobosae, 9.8–11.3–13.0 × 9.8–11.2–12.5 µm, amyloideae, spinis et verrucis usque ad 2(3) µm altis ornatae, macula suprahilaris non amyloidea. Basidia 45–55 × 12–18 µm, bispora, subcylindrata ad clavata. Cystidia 25–55 × 12–20 µm, cylindrata, clavata vel utriformia. Peridiopellis ex hyphis periclinis.</i> <i>Typus:</i> — THAILAND. Chiang Mai Province, Mae On District, about 3 km from Tharnthong Lodges, 725 m elev. N18°51’55’’, E99°17’23’’, 17 July 2012, leg. Felix Hampe, FH 12–160 (holotype, GENT!), MFLU 12–0650 (isotype, MFLU!). <b>Etymology:</b> —referring to the strictly 2-spored basidia. <b>Basidiocarps</b> angiocarpous, semihypogeous, 10–35 mm diam., 10–15 mm high, subglobose, rather regular. <b>Peridium</b> with minutely velutinous surface, chamois-leather-like, ochraceous yellow to yellow-brown. <b>Stipe</b> absent. <b>Columella</b> absent. <b>Gleba</b> whitish, strongly labyrinthuloid, with small loci, with some, but very few, gelatinous veins between the loci. <b>Latex</b> scarce, whitish hyaline, unchanging on the gleba and unchanging on white paper, unchanging with KOH. <b>Taste</b> bitter to astringent, disagreeable but not burning acrid. <b>Smell</b> not remarkable. <b>Basidiospores</b> globose to subglobose, 9.8– <i>11.3</i> –13.0 × 9.8– <i>11.2</i> –12.5 µm, Q = 1.00– <i>1.01</i> –1.04, n = 20; ornamentation amyloid, consisting of isolated, up to 2(3) µm high spines and isolated warts; spines conical, subacute, with rounded to tapering, rarely forked apex; apiculus up to 2.5(3) µm long; plage not distinct, inamyloid. <b>Basidia</b> 2-spored, subcylindrical to clavate, sometimes irregular and somewhat tortuous, 45–55 × 12–18 µm, with 5–12 µm long sterigmata. <b>Macrocystidia</b> very variable in shape, clavate, subcapitate, ventricose or lageniform, 25–55 × 12–20 µm, sometimes slightly but distinctly thick-walled. <b>Pseudocystidia</b> present. <b>Peridiopellis</b> consisting of 2–3 µm broad hyphae which are rather periclinally arranged in the subpellis, but form a densely intricate and interwoven layer on top and are embedded in a gelatinous matrix. <b>Habitat:</b> —primary tropical forest with <i>Dipterocarpus tuberculatus</i> Roxb. Known only from the type collection.
description: Published as part of <i>Verbeken, Annemieke, Hampe, Felix, Wissitrassameewong, Komsit, Hyde, Kevin, Eberhardt, Ursula &amp; Nuytinck, Jorinde, 2014, A new angiocarpous Lactarius species from Thailand, pp. 163-170 in Phytotaxa 181 (3)</i> on pages 166-167, DOI: 10.11646/phytotaxa.181.3.4, http://zenodo.org/record/5146035