Chinese black truffle

Overview

The Chinese black truffle, Tuber indicum, is an underground fungus that forms a mycorrhizal partnership with the roots of pines, oaks and chestnuts. It is native to the Himalayas and parts of China, and it is harvested wild. In China it is sold mainly from Yunnan and Sichuan, and it has become a major export.

The truffle has a dark brown, lumpy exterior and a reddish-purple to black interior with white veins. Its aroma is strong enough to attract animals, which spread its spores in their droppings.

Names and taxonomy

The species was described by Cooke and Massee in 1892 from the Himalayas and is named for India. It is now treated as a species complex. Molecular work suggests that T. indicum and T. sinense may be one species, and the Yunnan export population is proposed to be T. sinense. Some researchers suggest the name T. indicum complex, because the species are hard to tell apart by appearance.

The Chinese name is zhugongjun, meaning pig-humped fungus, a reference to the fact that Yunnan locals once fed the truffle to pigs. The catalogue records the name Tuber indicum as a research label rather than a reconciled accepted name, so records should be checked against current taxonomy.

Habitat and season

The fungus is hypogeous, so it grows and is collected below ground. It is ectomycorrhizal with pines such as Pinus armandii, oaks such as Quercus pubescens and chestnuts such as Castanea mollissima. In Yunnan it ripens from November to February, with the best harvest from November to January.

Commercial history

Local people in Sichuan and Yunnan gathered the truffle long before it had a market. Trade in it is now a large rural industry. China is the largest truffle exporter by mass and by value, and domestic consumption is rising.

Overharvesting, including the picking of immature specimens, has damaged wild stands. Yunnan authorities have issued woodland-maintenance guidelines, and the species was preliminarily assessed as Near Threatened in 2013. The sources do not describe commercial cultivation of this species.

Use and quality

The species is rated as choice for edibility in its infobox, and it is sold commercially as a truffle. It is sold commercially as a truffle that is distinct from the Perigord truffle.

The sources note that it is often sold fraudulently as Tuber melanosporum. One chemical study identified volatile compounds that separate the two species and proposed them as screening markers. This matters for buyers, because the product sold as T. indicum is not the same as the Perigord truffle.

Safety

The sources reviewed give no toxicity or safety statement for Tuber indicum, and no cooking method or safe quantity. Sources do not treat its edibility as a safety verdict, and this page does not add one.

Appearance, smell and taste do not establish that a truffle is safe to eat. Identify wild truffles with a qualified expert and follow official food safety advice before eating any wild fungus.

Open questions

The sources do not give a regional cooking tradition for the Chinese black truffle, a peer-reviewed review covering use, cultivation and fraud together, or a list of Chinese local names beyond zhugongjun. These are unknown, not negative findings.