Tuber sinoniveum S.P. Wan & F.Q. Yu, 2017

Xu, Wenjun, Wan, Shanping, Huang, Lanlan, Zheng, Yi, Gong, Hede & Yu, Fuqiang, 2017, Tuber sinoniveum, a new white Chinese truffle species from Yunnan, China, Phytotaxa 298 (3), pp. 253-260 : 257

Tuber sinoniveum S.P. Wan & F.Q. Yu , sp. nov. ( Fig. 3 )

MycoBank:—MB818667

Type:— CHINA. Yunnan Province, Baoshan City, Shuizhai Village, 25°15′N 99°17′E, alt. 2,500 m, in the humus soil under a pure forest of P. armandii . 1 Nov. 2014, wsp234, HKAS 88792.

Ascomata 1.5 cm in diam., irregularly subglobose, with shallow cream furrows, firm, white to whitish when fresh, yellowish brown when dried, smooth, pubescent in furrows. Peridium 180–580 μm thick, with two layers, the outer layer 35–190 μm thick, pseudoparenchymatous, composed of large, subglobose to subangular cells of 3–28 (–30) × 2–24 (–26) μm, hyaline; the inner layer 60–490 μm thick, intricately interwoven, composed of hyaline and thin-walled hyphae, 1–8.5 μm in diam; the outmost cells developed into radial cystidia up to 107 μm long, 6.5 μm in diam, dense, multi-septate, obtuse, hyaline. Gleba solid, whitish when young, marbled with white veins, composed of hyaline, interwoven, thin-walled hyphae, 1–8 μm in diam, often with cells inflated to 3.5–18 × 3–11.5 μm. Odor pleasant. Asci globose to subglobose, pyriform, ellipsoid or irregular, hyaline, sessile or with a short stalk, with a thin 1–2 μm wall, 70–120 × (64–) 66–88 μm, 2–4-spored. Ascospores subglobose to globose, hyaline when young, becoming brown at maturity, excluding their alveolate-reticulate ornamentation, in 1-spored asci (35.5–) 37.5–45.5 (–46) × (35.5–) 36–45 (–45.5) μm, in 2-spored (21–) 23.5–45.5 (–46) × (20.5–) 23–45 (–45.5) μm, in 3-spored 26–35.5 (–38) × 25.5–34.5 (– 37) μm, and in 4-spored (21–)23.5–31.5 (–33.5) × (20.5–) 23–31 (–33.5) μm; Q = 1–1.07, Qm = 1.02 ± 0.01, reticulum alveolate with 3–9 meshes along the spore length and across, up to 2–10.3 μm tall.

Diagnosis: —Differing from T. sinosphaerosporum in its possession of a pubescent peridium and more meshes (3–9) along the spore length.

Habit, habitat and distribution: —Hypogeous, in soil under P. armandii in Yunnan Province, China. Only known from China.

Etymology: —Referring to the white color of the ascomata.

Figures

FIGURE 3. Tuber sinoniveum sp. nov. (HKAS 88792, holotype). a. Ascoma and section. b. Peridium section. c. Scanning electron micrograph (SEM) of ascospore. d, e. Light micrographs (LM) of asci and ascospores. f. Cystidia.