Albatrellus shouxiangu Xin Zhang, Y.C. Dai & H.M. Zhou, sp. nov. Figs. 2, 3. MycoBank: MB857685 Etymology: — Shouxiangu refers to the famous Chinese pharmaceutical company, “ Zhejiang Shouxiangu Pharmaceutical Co., Ltd”. Diagnosis: — Albatrellus shouxiangu resembles A. macrosporus H.M. Zhou et al., but differs from A. macrosporus by smaller basidiospores (4.4–5.5 × 3.9–4.8 μm vs. 6.2–8 × 5–6.5 μm) and pores (3–5 per mm vs. 2–3 per mm; Zhou et al. 2025). Holotype: — CHINA. Zhejiang Province, Jinhua, Wuyi County, Niutoushan National Forest Park, on the ground in the forest of Vaccinium, 13. August 2023, Dai 25607 (holotype, BJFC043156). Basidiomata: —Basidiomata annual, terrestrial, centrally to eccentrically stipitate, solitary or a few confluent. Pilei semicircular to circular, applanate with a depressed center, margin initially reflexed, turning incurved and wavier upon drying, up to 4 cm in diam and 4 mm thick at the center. Pileal surface saffron (1 B 7) when juvenile, sulphur-yellow (1 A 4) to buff (2 A 3) when mature with irregular yellow (1 A 5) or white (1 A 1) patches, becoming olivaceous buff (3 B 4) to grayish brown (5D5) when dry, smooth, azonate. Pore surface white (1 A 1) when fresh, becoming cream (2 A 2) to buff (2 A 3) when dry; pores circular to angular, 3–5 per mm; dissepiments thin, entire. Context thick at center, sharply thinning towards margin, white (1 A 1) when fresh, cream (2 A 2), and brittle when dry, up to 2.4 mm thick. Tubes concolorous with pore surface, brittle when dry, decurrent, up to 1.6 mm long. Stipe straw-yellow (2 A 4) when fresh, grayish-brown (5D5) when dry, up to 2.8 cm long, 7 mm in diam. Hyphal structure: —Hyphal system monomitic; generative hyphae thin- to thick-walled, simple septate. Pileipellis: —Generative hyphae slightly thick-walled, frequently branched, interwoven, simple septate, IKI+, CB–, 3–8 μm in diam, sometimes inflated up to 12 μm in diam; shapeless oily substance exuding from the hyphae, becoming dark bluish gray in KOH and yellowish brown to reddish brown in Melzer’s reagent; gloeoplerous hyphae abundant, thick-walled, 3–8 μm in diam, sometimes inflated up to 13 μm in diam. Context: —Generative hyphae hyaline, slightly thick- to distinctly thick-walled, frequently branched, interwoven, simple septate, IKI–, CB–, 3–12 μm in diam, sometimes inflated up to 15 μm in diam; gloeoplerous hyphae infrequent, slightly thick- to thick-walled, 3–12 μm in diam, sometimes inflated up to 16 μm in diam. Stipe: —Generative hyphae hyaline, thick-walled, rarely branched, loosely interwoven, simple septate, IKI–, CB–, 4–15 μm in diam, sometimes inflated up to 22 μm in diam; shapeless oily substance rarely exuding from the hyphae. Tubes: —Generative hyphae thin- to slightly thick-walled, rarely branched, interwoven, simple septate, IKI–, CB–, uniformly 2–5 μm in diam; gloeoplerous hyphae rare; cystidia and cystidioles absent; basidia clavate with four sterigmata and a simple septum at the base, 16–28 × 6–9 μm. Spores: —Basidiospores subglobose, hyaline, thick-walled, smooth, often with a large guttule, weakly IKI+, CB–, (4.1–)4.4–5.5(–5.7) × (3.7–)3.9–4.8(–5) μm, L = 4.96 μm, W = 4.37 μm, Q = 1.12–1.16 (n = 90/3). Additional specimens examined (paratypes): — CHINA. Zhejiang Province, Jinhua, Wuyi County, Niutoushan National Forest Park, on ground in forest of Vaccinium, 13 August 2023, Dai 25605 (BJFC043154), Dai 25608 (BJFC043157).

Published as part of Zhang, Xin, Zhao, Ya-Lin, Li, Ming-Rui, Luo, Kai-Yue, Zhou, Hong-Min & Wu, Fang, 2025, Albatrellus shouxiangu (Albatrellaceae, Russuales): a new terrestrial stipitate species from Eastern China, pp. 75-88 in Phytotaxa 717 (1) on pages 81-84, DOI: 10.11646/phytotaxa.717.1.5, http://zenodo.org/record/18507573