Gliophorus fumosus D. J. Lodge, S. D. Russell & Leal-Dutra 2026, sp. nov.

Gliophorus fumosus D. J. Lodge, S. D. Russell & Leal-Dutra sp. nov. Fig. 7 Etymology. Fumosus = smoke, referring to the type locality in the Great Smoky Mountains National Park and to the smoky colour of the stipe. Diagnosis. Basidiomata resembling Gliophorus irrigatus but basidiospores shorter (5.6–7.4 vs. 6.5–9) and hitherto recorded only in North America. Holotypus. USA • North Carolina, Haywood Co., Great Smoky Mt. National Park, Cataloochie Cove, near Rough Fork & Big Fork Ridge trails, 35.6164 -83.1208, in forest, 12 Aug 2005, E. B. Lickey & D. J. Lodge (voucher TENN-F-061868 [DJL 05 NC 50], holotype) (GenBank ITS: KF 291086). UNITE / PlutoF: SH 0910862.10 FU (1.5 % threshold). Description. Pileus 10–35 mm diam., shape variable amongst and within collections, narrowly to broadly campanulate with a mammalate umbo when young in the type and iNaturalist: 145165934 and iNaturalist: 178924890, often parabolic-umbonate or convex-hemispheric with a low umbo, becoming broadly parabolic or broadly convex with age with or without a low umbo, margin straight, translucently striate one third to two thirds to centre, glutinous or viscid, Drab (9.0 YR 5.5 / 2.5) or greyish-brown with darker striae and Dark Greyish-Brown (6.0 R 2.0 / 1.0) centre (Fig. 7). Stipe 30–60 × 2–5 mm, cylindrical, hollow, often tapered at base and flared at apex, rarely caespitose; surface Smoke Grey (2.5 Y 6.0 / 2.4 to 5.0 Y 7.0 / 2.0), drab grey or Drab (9.0 YR 5.5 / 2.5), glutinous to viscid, hyphae with small clamps. Lamellae 5–10 mm broad, sinuate with a small to large decurrent tooth, white, pale grey towards pileus, regular, 1–2 lengths of lamellulae inserted, edges concolorous, slightly wavy. Lamellae of iNaturalist: 290749159 emitted an intense blue light under UVf 365 nm. Taste and odour indistinct. Basidiospores broadly ellipsoid or ellipsoid, 5.6–7.2 (– 7.4) × 4–5.6 µm (mean 6.7 × 4.6), Q = 1.3–1.6 (– 1.7), (mean 1.5) (type collection n = 20). Basidia 35–82 × 7.2–15.2 µm, 4 - spored with medallion clamps at base. Cystidia absent on lamellae. Hymenophoral trama subregular, comprised of cells 19.2–82 × 8.8–15.2 µm, gelatinisation absent, conducting elements abundant in context at the lamellar edge. Pileipellis and stipitipellis an ixotrichoderm. Habitat. Recorded on forest soil, with one eDNA record detected in Fagaceae roots (Arkansas, USA). iNaturalist: 290749159 was collected between a bog and pond under Quercus sp. and Nyssa sylvatica, with abundant Vaccinieae in the understorey. Habitats covered in eDNA studies include prairie and alpine habitats extending to western USA in addition to eastern forests. Geographical distribution. Basidiomes known only from eastern North America, but eDNA data suggests distribution as far west as Arizona, Colorado and Oregon (Fig. 5 D). Other specimens examined. USA • (1) Indiana, Porter Co., North Mineral Springs, Indiana Dunes National Lakeshore, Dune Acres, Cowles Bog Trail, 41.6495, -87.0744, 4 Jul 2017, S. D. Russell, MM 6069 (PUL 00035147; F 20317), (ITS: ON 562444); (2) Ohio, Summit Co., Green, Nimisila Reservoir Metro Park, 40.9369, -81.5155, 18 Jun 2025, Jessica Williams, 2025 SMP 20, iNaturalist: 290749159 (ITS: PX 103270), KEF 015 as “ Gliophorus ‘ irrigatus - IN 01 ’. Additional records based on photographs and ITS sequences. Sequenced photographic records posted on iNaturalist are all