Hydnum regznae Kibby, Liimat. &amp; Niskanen
Creators: name: Kibby, Geoffrey
name: Liimatainen, Kare
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Fungi
Basidiomycota
Agaricomycetes
Cantharellales
Cantharellaceae
Hydnum
Hydnum regznae

description: <i>Hydnum regznae</i> Kibby, Liimat. &amp; Niskanen IF559703 <b>Holotype</b>: UK England, North Downs Way, White Down, Surrey, TQ113487, 13 October 2021. Under <i>Fagus</i>, Coll. G. Kibby, M. Tortelli &amp; C. Soler. K-M 000265258, GenBank no: ON502618, Kibby, G.G. &amp; Liimatainen, K. (2002). Nomenclatural novelties. Index Fungorum 523:1. Figs. 1, 3, 4 &amp; back cover Etymology: <i>regznae</i> = Latin for a queen, in honour of Queen Elizabeth II’s Platinum Jubilee. <b>Basidiomata</b> medium to large, growing isolated or in confluent groups. Pileus 50–150 mm diam, very irregular in outline, rounded to elongateellipsoid, fleshy, initially convex then plane to depressed and frequently with very irregular lumps and bumps, glabrous to slightly velutinous. Colour initially pure white then slowly pale cream to yellowish cream. Margin involute and remaining so, sinuous and often lobed with age (Fig. 1 &amp; back cover). <b>Spines</b> decurrent, conical near the pileus margin becoming increasingly flattened near the stipe and often with two to three points per spine; 5–8 x 0.5–1 mm. Colour pale luteous at first, soon pale salmon pink (Fig. 3). <b>Stipe</b> cylindric to slightly clavate, 20–40 ◊ 30– 40 mm, concolorous with the pileus, basal mycelium white. <b>Context</b> white to greyish cream in the base of the stipe. <b>Odour</b> ill-defined but pleasant, slightly sweet. <b>Flavour</b> mild, soapy then slowly slightly bitter. <b>Macrochemical reactions</b>: KOH + context = no reaction, Guaiac + context no reaction. <b>Basidiospores</b> ovoid to broadly ellipsoid, thinwalled, hyaline, non-amyloid, (4.5-)4.9–5.4 x 3.8– 4.3 µm, av = 5.1 x 3.9 µm, Q = 1.2–1.4, av Q = 1.3 (Fig. 4). <b>Basidia</b> 35–40 x 5–6 µm, 4- to 6-spored, sterigmata 3–4 µm. <b>Hyphae</b> of the apex of the spines cylindrical, thin-walled, hyaline with cylindrical to clavate ends, 3–4 µm diam. <b>Clamp connections</b> present. Ecology and distribution The English collections (holotype and paratypes) were from deciduous forest, mainly <i>Fagus</i> on calcareous soils in leaf litter or emerging from bare soil. So far known also from Estonia, Germany, Slovenia, Spain, and Sweden. A collection of what appears to be the same species but awaiting sequencing has also been recorded in Wales from open calcareous grassland with <i>Helzanthemum</i> on the Great Orme. The pallid fruitbodies and the small spores would place this species in subgenus <i>Alba</i> (Niskanen <i>et al</i>., 2018) which includes <i>H. albzdum</i> sensu stricto and it would appear to be the only European representative of this subgenus to date. Other pallid species in Europe are usually easily distinguished by their larger and often differently shaped spores and differently coloured spines. Perhaps most similar in appearance is the white to cream-coloured <i>H. boreorepandum</i> Niskanen, Liimat. &amp; Niemalä in subg. <i>Hydnum</i>. This is known from forests of <i>Pzcea</i>, <i>Pznus</i> and <i>Betula</i> in Finland and differs in its more regularly shaped fruitbodies with longer stipes, less decurrent and non-pink spines, as well as larger spores. <i>H. regznae</i> appears to be genuinely rare in Britain and confined to calcareous soils. It is possible that it has been passed over as just palecoloured specimens of the common <i>H. repandum</i> although it is so striking in the field that this seems unlikely. The Surrey population was in a relatively small stand of <i>Fagus</i> on fairly steep slopes and was even observed pushing out through roadside embankments below the tree line. The possible occurrence with <i>Helzanthemum</i> in Wales is particularly interesting and it may be that searches on similar sites around the country will reveal more populations.
description: Published as part of <i>Kibby, Geoffrey &amp; Liimatainen, Kare, 2022, Hydnum reginae newly described from Britain, pp. 77-80 in Field Mycology 23 (3)</i> on pages 79-80, DOI: 10.5281/zenodo.7595147
description: {"references": ["Niskanen, T., Liimatainen, K., Nuytinck, J., Kirk, P., Orijel, R. G., Norvell, L., Ibarguren, I. O., Huhtinen, S., Kytovuori, I., Ruotsalainen, J., Niemela, T., Ammirati, J. F. &amp; Tedersoo, L. (2018). Identifying and naming the currently known diversity of the genus Hydnum (cantharellales) with an emphasis on North American and European materials. Mycologza 110 (5): 890 - 918."]}