taxonID	type	description	language	source
03B087C2FFED8679FF46FF482B3EFF40.taxon	diagnosis	Diagnosis: — Tuber mongolicum differs from related species by its pseudoparenchymatous peridum, ellipsoid ascospores and 1 – 5 spored asci. Etymology: — ‘ mongolicum’ refers to its occurrence in Inner Mongolia Autonomous Region, China. Types: — CHINA, Inner Mongolia Autonomous Region, Tongliao Daqinggou National Nature Reserve, in soil under Populus sp., 42 ° 47 ′ N, 122 ° 10 ′ E, 214 m, 23 Aug. 2022, Fang Guo, Tolgor Bau, HMJAU 65125 (holotypus!). Same location; Fang Guo, Tolgor Bau HMJAU 65126 (paratypus!). Description: — Ascomata are spherical to irregular spherical, 0.8 – 1.5 cm in diameter, with depressions. The surface is yellowish-green (30 B 7), olive-brown (4 D 7) to yellowish brown (5 D 8) when fresh, with small protrusions at the concave part of the fruiting body. Gleba is yellow-brown with white veins that have a sparse radial distribution from the base, and starch-like aroma (Figs 2 – 3). Peridum is 349 – 506 µm, thick, with two layers: the outer layer is yellow-brown, and 71 – 174 μm thick, the inner layer is a clear shade, 205 – 418 μm thick, and composed of sub-globose pseudoparenchymatous cells of 15 – 33 × 9 – 20 µm wide (Figs 4 a, 5 c). Asci are usually 1 – 4 - spored, but occasionally 5 - spored. Asci are sub-globose to ellipsoid, thin-walled, and short or nearly sessile, measuring 56 – 91 × 46 – 68 µm (Figs. 4 b-c. 5 b). Ascospores are oblong-ellipsoid, ellipsoid to broadly ellipsoid, yellow-brown at maturity, and reticulate. In 1 - spored asci 38 – 50 × 30 – 40 µm, Q = 1.1 – 1.28, in 2 - spored asci 33 – 44 × 25 – 37 µm, Q = 1.1 – 1.4, in 3 - spored asci 28 – 40 × 22 – 28 µm, Q = 1.15 – 1.43, in 4 - spored asci 25 – 35 × 20 – 29 µm, Q = 1.15 – 1.37, in 5 - spored asci 26 – 31 × 22 – 25 µm, Q = 1.1 – 1.24, spike ornamentation 2.92 – 5.06 µm length, and mostly 3 – 6 meshes across the spore width (Figs 4 b-c, 5 b). Habitat: Hypogeous, in soil under Populus sp.; ascoma occurring in autumn. Distribution: Only within Inner Mongolia Autonomous Region, Northern China.	en	Guo, Fang, Bau, Tolgor (2023): A new species of Tuber (Tuberaceae, Pezizales) from Inner Mongolia, China. Phytotaxa 592 (1): 39-48, DOI: 10.11646/phytotaxa.592.1.3, URL: http://dx.doi.org/10.1094/PDIS-04-22-0755-PDN
