Calonarius aglaeus

Calonarius aglaeus S.D. Adams, Bojantchev & N. Siegel, sp. nov.

Holotype SDA362 WTU F-075686


Pileus 30–70 mm wide, convex to plane, slightly uplifted in age, surface thinly viscid, with adhering debris, appressed-fibrillose over margin. Pale straw yellow, ochre-yellow to ochrebrown when young, soon dingy ochre-yellow, ochre brown to tawny brown or wood brown in age. Context white to off-white, mottled with beige, tan to ochre above lamellae and base of stipe. Lamellae adnexed to adnate, close, narrow. Pallid or argillaceous with a pink to lilaceous cast when young, becoming grayish to grayish brown. Stipe 25–53 mm long, 9–25 mm at apex, cylindrical to obliquely marginate bulb, base occasionally with white rhizomorphs, surface dry, with scattered cortina remnants. Off-white to creamy white, soon showing yellow-brown staining. Cortina scant, yellow, leaving an evanescent band on stipe. Odor indistinct, taste mild. KOH orange-brown on cap, light-brown on stipe context. Exsicata brown to yellow-ochre, stipe context paler.

Microscopy: Basidiospores (68/3 collections) 9·5–12 x 5–6 µm, avg. 10·5 x 5·5 µm, Qr. 1·65–2·10, Qa 1·90, citriform to amygdaliform, lightly to moderately verrucose. Basidia 28–38 µm x 7-9 µm, 4-spored, clavate, clamped at base. Pileipellis simplex; epicutis well developed, cylindrical hyphae 2·5–8 µm wide, in a gelatinous matrix, yellowish to colorless, finely encrusted to smooth, clamped. Hypocutis strongly pigmented, yellowish-brown, composed of interwoven, more or less radially arranged, clamped hyphae


Ecology and distribution

Scattered and clustered in moss-covered gravelly soil, in conifer forest of Abies amabilis, Abies lasiocarpa, Tsuga heterophylla, Tsuga mertensiana, and Pinus ponderosa in western North America.


Calonarius aglaeus is in subgenus Fulvi, section Splendentes (Liimatainen et al. 2022). The closest relative of C. aglaeus in Genbank is C. alnobetulae with approximate similarity of 96.14% and 17 base pair differences. Based on phylogenetic analysis, C. aureocalceolatus is another related species with approximate similarity of 94·36% and more than 22 base pair differences. Calonarius aglaeus resembles C. alnobetulae in the pink to lilaceous young gills, whitish context and marginate bulb. However, C. aglaeus exhibits more yellow-brown tones on pileus. Additionally, it has an orange-brown rather than blackish-brown KOH reaction on the pileus.


The specific epithet derives from the Greek name Aglaia, meaning splendid, beautiful or bright, referring to the lilac to pink blush on young gills of this species.

Specimens examined

USA, California, Tuolumne Co., Yosemite National Park, off Hwy 120 (37°49.03′, -119°42.71′), elev. ~7000 ft, under Abies concolor, Abies magnifica, Pseudotsuga menziesii, and Pinus ponderosa, 15 Nov. 2011, D. Bojantchev, DBB46450 (WTU F-075688), GenBank OP799361. Washington, King Co., Forest road 6830 spur, 0.6 mi before Tonga Ridge Trailhead (47.685071, -121.262610). In young conifer forest of Abies amabilis, Abies lasiocarpa, Tsuga heterophylla, and Tsuga mertensiana. 8 Oct. 2018, N. Siegel, NS3318 (WTU F-075671), GenBank OP799360. 13 Oct. 2018, S. Adams, SDA 362 (Holotype), GenBank OP799359.


Index Fungorum no. 535, Effectively published 22/05/2023 15:45:00 (ISSN 2049-2375) Nomenclatural novelties : S.D. Adams, N. Siegel, D. Bojantchev, K. Liimatainen & T. Niskanen

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