Tuber qujingense S. P. Wan, 2021

Wan, Shanping, Liu, Jianwei, Huang, Lanlan, Qin, Xiaomin, Liu, Wei & Yu, Fuqiang, 2021, Tuber qujingense and T. songlu, two new species from Yunnan, China, Phytotaxa 527 (4), pp. 248-256 : 251-252

Tuber qujingense S. P. Wan , sp. nov. ( Fig. 3 )

MycoBank: MB 839733

Typification: CHINA. Yunnan Province, Huize County (18.103°E, 23.26°N), in humic soil under a pure Pinus armandii forest, at about 2400 m, 12 August 2016, wsp721, HKAS 95823 (GenBank Acc. No.: ITS = KX904885 , LSU = KY 013659 ).

Diagnosis: Tuber qujingense differs from related species by its greyish white ascomata, brown snowflake-shaped gleba, prosenchymatous peridium, fusiform ascospores and 1–4 spored asci.

Etymology: Refers to the location of the type collection.

Description: Ascoma 2.5 cm in diam, subglobose or irregular, greyish white when fresh, becoming brown when dried. Peridium 200–500 µm thick, smooth to pubescent, one layer, prosenchymatous, composed of big, subglobose to subangular cells, (1–) 2–33 (–34.5) × (1–) 1.5–22 (–33) µm, light earthy yellow. Gleba solid, brownish purple when mature, marbled with white veins, composed of hyaline, interwoven, thin-walled hyphae, 1.5–6 µm, and cylindrical, inflated hyphae 2.8–50 × 2.8–43 µm. Dermatocystidia or setae, straight or bent, obtuse or apiculate at the tip, up to 110 µm long, 6.5 µm in diam, septate, hyaline to whitish. Asci (40–) 51–80 × (30–) 31–60 µm, globose to subglobose, pyriform, ellipsoid or irregular, hyaline, sessile or with a short stalk, thin-walled 1–2 µm thick, 1–4 spored. Ascospores, fusiform, ellipsoid, sometimes broadly ellipsoid, subglobose, hyaline when young, becoming brown at maturity; excluding the alveolate-reticulate ornamentation, in 1-spored asci (35–)37–48(–50) × (23–) 25–30(–32) µm (Q = 1.45–1.65), in 2-spored (22–) 28–40(–41) × (14–) 18-27 µm (Q = 1.41–1.7), in 3-spored (20–)3 8–18(–20) × 15–19(– 24) µm (Q = 1.23–1.75), and in 4-spored (17–) 20–34(–36) × 14–21(–22) µm (Q = 1.14–1.72); reticulum with 3–10 meshes along the spore length and 3–8 across. The alveolar walls up to 4.5–11 µm tall.

Distribution and habitat: Hypogeous, in soil under pure stand of P. armandii in Yunnan Province, China. Known only from China.

Figures

FIGURE 3. Tuber qujingense (HKAS 95823, type) A. An ascoma and its gleba; B. Dermatocystidia; C. Peridium section; D, E. Light micrograph (LM) of ascospores; F. SEM photo of an ascospore. Photos by: Shanping Wan.