Hydnellum scabrosellum Nitare &amp; Ainsworth &amp; Larsson &amp; Parfitt &amp; Suz &amp; Svantesson &amp; Larsson 2021, sp. nov.
Creators: name: Nitare, J.
name: Ainsworth, A. M.
name: Larsson, E.
name: Parfitt, D.
name: Suz, L. M.
name: Svantesson, S.
name: Larsson, K. - H.
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Thelephorales
Bankeraceae
Hydnellum
Hydnellum scabrosellum

description: <i>Hydnellum scabrosellum</i> Nitare <i>sp. nov.</i> MycoBank MB 837987. Figs 8A‒C, 9G. <i>Etymology</i>: Epithet derived from <i>scabros</i> [<i>um</i>] and - <i>ellum</i> (L. dim.) referring to “the small <i>scabrosum</i> ” (= <i>Hydnum scabrosum</i> Fr.). <i>Typus</i>: <b>Sweden</b>, Uppland, Börstil parish, Tvärnö, Tuskö, Tuskösundet nat. res. (“Återvändan”), in herb-rich conifer forest dominated by <i>Picea abies</i> with some scattered old <i>Pinus sylvestris</i>, on strongly calcareous moraine on the edge of an old abandoned mine-shaf, 60.22267 / 18.49009, 13 Sep. 2012, <i>J. Nitare</i> (<b>holotypus</b> GB-0195689; <b>isotypi</b> O, UPS); GenBank accession: MW144379. <i>Description</i>: <i>Basidiomata</i> terrestrial, stipitate, thin and slender, single or concrescent. Pileus 30‒60(‒100) mm broad, planoconvex to depressed, with undulating thin margin. Cuticle fibrillose and scaly, cracking up from the centre, at first rosy to pinkish, with whitish growing edge, with age becoming coppery or vinaceous reddish-brown to purplish-brown, with darkening blackish-brown scales in the centre. <i>Stipe</i> 30‒60 × 5‒10 mm, above ochraceous pinkish-brown or concolourous with the pileus, tapering downwards, at the base bluish-grey or blackishgreen under a white mycelial cover. <i>Spines</i> strongly decurrent, ofen reaching the middle of the stipe, up to 5 mm long, crowded, at first pallid and whitish, by age becoming yellowish brown, when dry yellowish to ochraceous. <i>Flesh</i> not zoned,fresh pale, when dry (exsiccates) yellowish-ochraceous brown. <i>Smell</i> subfarinaceous, taste bitterish. <i>Chemical reaction.</i> When adding 3 % KOH to dry specimens, only the pileipellis (not the flesh) immediately changes colour to charcoal black. <i>Hyphal system</i> monomitic, all hyphae simple septate, generative hyphae up to 10 µm wide. <i>Basidia</i> clavate, with four sterigmata. <i>Basidiospores</i> pale brownish, globose or irregularly subglobose, tuberculate, with oblique apiculus, 5.1‒6.6 × 3.4‒4.7 µm, av. = 5.8 × 4.0 µm, Q = 1.2‒1.7 (n = 3/90, measurements from the lateral side without tubercles), tubercles numerous, 0.6‒0.9 µm high, with prominent, rounded, flattened, flat-topped to exsculpate apices. <i>Ecology and distribution</i>: Presumably ectomycorrhizal with conifers (mixed forest with <i>Pinus</i> and <i>Picea</i>, associated treespecies not exactly known but probably <i>Pinus sylvestris</i>), strongly calciphilous. Mostly known from coniferous forests situated close to the coast (Gulf of Bothnia) in the province of Gästrikland and northern Uppland, east-central Sweden (at the northern limits of the hemiboreal vegetation zone). This so far Swedish species can be expected to occur in pine forests on calcareous ground around the Baltic Sea. <i>Additional specimens examined</i>: <b>Sweden</b>, Gästrikland, Hamrånge, Bergby, Näset nat. res., calcareous conifer forest, 15 Sep. 2011, <i>J. Nitare</i> GB-0195807; Uppland, Börstil, Tvärnö, Tuskö, Tuskösundet,5 Sep. 2008, <i>J. Nitare</i> GB-0195806 (from the same spot as the holotype, fig. 12A in Nitare &amp; Högberg 2012); Älvkarleby,Lanforsen, Tippön,calcareous <i>Pinus sylvestris</i> forest (with scattered <i>Picea abies),</i> 20 Sep. 2013, <i>G. Aronsson</i> GB-0195791; Askön, calcareous <i>Pinus sylvestris</i> forest (with scattered <i>Picea abies</i>), 13 Sep. 2013, <i>G. Aronsson</i> GB-0195792; Östergötland, Västra Tollstad, Omberg, Ombergsliden nat. res., on soil in calcareous <i>Picea abies</i> forest with <i>Pinus sylvestris</i> and <i>Betula</i> sp., 13 Sep. 2016, <i>E. Larsson</i> GB-0195736. <i>Notes</i>: Among the hydnoid fungi associated with conifers, <i>Hydnellum scabrosellum</i> is most similar to <i>H. scabrosum</i> but has smaller and slenderer basidiomata and looks like a dwarf form of the latter species. The size difference is particularly obvious when considering the stipe diameter which rarely exceeds 1 cm in <i>H. scabrosellum</i> but is usually 2‒5 cm in mature specimens of <i>H. scabrosum</i>. The yellowish-ochraceous hymenium and flesh (when dry) and the occurrence on base-rich soil, also differs from the non-calciphilous <i>H. scabrosum</i>. The coastal region in Gästrikland, where most collections were made, is characterized by its extremely calcareous-rich soils (moraine), depending on the geological features and recent land uplif during the postglacial period.
description: Published as part of <i>Nitare, J., Ainsworth, A. M., Larsson, E., Parfitt, D., Suz, L. M., Svantesson, S. &amp; Larsson, K. - H., 2021, Four new species of Hydnellum (Thelephorales, Basidiomycota) with a note on Sarcodon illudens, pp. 233-254 in Fungal Systematics and Evolution 7 (1)</i> on pages 250-251, DOI: 10.3114/fuse.2021.07.12, http://zenodo.org/record/5838834
description: {"references": ["Nitare J, HOgberg N (2012). Svenska arter av falltaggsvampar (Sarcodon) - en preliminar rapport [The genus Sarcodon in Sweden - a preliminary report]. Svensk Mykologisk Tidskrif 33: 2 - 49."]}