Cantharellus macrocarpus N.K. Zeng, Y.Z. Zhang & Zhi Q. Liang, 2021

Zhang, Yu-Zhuo, Liang, Zhi-Qun, Xie, Hui-Jing, Wu, Lu-Ling, Xue, Rou & Zeng, Nian-Kai, 2021, Cantharellus macrocarpus (Cantharellaceae, Cantharellales), a new species from tropical China, Phytotaxa 484 (2), pp. 170-180 : 174-175

Cantharellus macrocarpus N.K. Zeng, Y.Z. Zhang & Zhi Q. Liang , sp. nov. ( Figs. 2–3 )

MycoBank: MB837434

Etymology:—Latin “ macrocarpus ” refers to the large basidioma.

Diagnosis:—Characterized by large basidioma with a bright yellow-orange pileus, a well-developed, rugulose hymenophore, cream to pale yellowish stipe, noticeably thickened hyphal walls in the pileipellis, presence of clamp connections in all parts of the basidiomata, and distribution in tropical Asia.

Holotype:— CHINA. Hainan Province: Changjiang County, Bawangling National Nature Reserve, elev. 650 m, 23 May 2019, N. K. Zeng 4050 ( FHMU3304 ). GenBank accession number: 28 S = MT 986061 , ITS = MT 990453 , TEF1 = MT 990634 .

Description:— Pileus 10–16 cm diam, infundibuliform; margin slightly incurved, irregular, often wavy and lobed; surface dry, nearly glabrous, bright yellow-orange (2A7), darker brownish yellow (3A8) when old; context about 4 mm thick in the center of the pileus, white (1B1), unchanging in color when injured. Hymenophore composed of relatively well-developed, decurrent, branched to furcate gill folds, rugulose, becoming strongly intervenose with age, yellow-orange (2A7) to deep brownish yellow (3A7), unchanging in color when injured. Stipe 5.2–6.5 × 1.7–2.2 cm, central, subcylindric, solid; surface cream to pale yellowish (2A2–4); basal mycelium white (1A1). Taste and Odor not distinctive. Spore print not obtained.

Basidiospores [340/17/5] 6.5–7.2–8 × 4–4.7–5(–5.5) μm, Q = (1.3–)1.4–1.75(–1.88), Qm = 1.54 ± 0.13, ellipsoid, smooth, thin to slightly thick-walled (up to 0.5 μm), hyaline in 5% KOH, containing lipid droplets. Basidia 53–76.5 × 7.5–9 μm, narrowly clavate, slender, thin to slightly thick-walled (up to 0.5 μm), (4–)5(–6)-spored, colorless to hyaline in 5% KOH; sterigmata 4–5 μm long. Subhymenium filamentose, composed of long, slender hyphae measuring 3–5 μm diam. Cystidia absent. Pileipellis a cutis 70–100 μm thick, composed of interwoven, filamentous hyphae, 4–9 μm diam, hyaline in 5% KOH, slightly thick-walled (0.5–1μm); terminal cells 53–112 × 5–9 μm, subcylindrical to subclavate with obtuse apex. Clamp connections present in all parts of basidiomata.

Habitat:—Scattered to gregarious on the ground in a mixed forest of Pinus latteri Mason and Lithocarpus corneus (Lour.) Rehd.

Known distribution:—Southern China (Hainan Province) and Laos.

Additional specimens examined:— CHINA. Hainan Province: Changjiang County, Bawangling National Nature Reserve , elev. 650 m, 23 May 2019, N. K . Zeng 4036 ( FHMU3303 ); same location, 31 August 2019, N. K . Zeng4205, 4207, 4208 ( FHMU3356 , 3357 , 3358 ) .

Figures

FIGURE 2. Basidiomata of Cantharellus macrocarpus (a–b from FHMU3358; c from FHMU3304, holotype; d from FHMU3356). Photos by N.K. Zeng.

FIGURE 3. Microscopic features of Cantharellus macrocarpus (FHMU3304, holotype). a. Basidiospores. b. Basidia. c. Pileipellis. Bars = 10 μm. Drawings by Y.Z. Zhang.