Terfeziaceae

The Terfeziaceae, or desert truffles, is a family of truffles (, , , ) endemic to arid and semi-arid areas of the Mediterranean Region, North Africa, and the Middle East, where they live in ectomycorrhizal association with '' Helianthemum'' species and other ectomycorrhizal plants (including '' Cistus'', oaks, and pines). This group consists of three genera: ''Terfezia'', ''Tirmania'', and ''Mattirolomyces''. They are a few centimetres across and weigh from 30 to 300 grams (1–10 oz). Desert truffles are often used as a culinary ingredient.

Description

Fruit-bodies ( ascomata) are large, more or less spherical to turbinate ( top-shaped), thick-walled, and solid. The asci are formed in marbled veins interspersed with sterile tissue. The asci are cylindrical to spherical, indehiscent (not splitting open at maturity), and sometimes stain blue in iodine. Ascospores are hyaline to pale brown, spherical, and uninucleate.

Genera

According to BioLib, Terfeziaceae contains the following genera:

Distribution and habitat

Desert truffles have been found in arid and semi-arid zones of the Kalahari Desert, the Mediterranean basin, Syria, Azerbaijan, Iran, Iraq, Kuwait, the Negev desert in Israel, the Sahara, Saudi Arabia, Qatar, Libya, Spain, Greece, Cyprus, Hungary, Croatia, and China.Kagan-Zur V. Terfezias, a family of mycorrhizal edible mushrooms for arid zones. In: As the name suggests, they predominantly grow in the desert. They can be formed near Sunrose (Helianthemum) plants, but they are very rare to find and cannot be cultivated (justifying their cost).

Uses

Desert truffles do not have the same flavor as European truffles, but tend to be more common and thus more affordable. Forest truffles (genus ''Tuber'') typically cost $1,000 per kilogram; Italian truffles may sell for up to $2,200 per kg, while ''Terfezia'' truffles sold as of 2002 in Riyadh for $200 to $305 a kg, and in recent years have reached, but not yet exceeded, $570. Israeli agricultural scientists have been attempting to domesticate ''Terfezia boudieri'' into a commercial crop.

Names

Desert truffles go by several different names. In Iran and Azerbaijan they are called ''Donbalan'' or . In Turkish they are called in Turkiye, also ''Keme'' on the Syrian-Turkiye border. In Algeria and Tunisia they are called ; the Bedouin of the Western Desert call them ''terfas ترفاس''. The Kuwaitis call them , the Saudis , and in Syria, and in Libya ; they are known by their classical Arabic name, ''.'' Iraqis call them '','' or '','' depending on local dialects and in Oman they are . The Hebrew word is כמהין ( in singular). In Catalonia they are known as and . In southern Spain, they are known as or and in the Canary Islands they are known as . In Botswana they are called ''mahupu''. In Hungary they are known as ('sand truffles') and are sold to English-speaking nations as ''honey truffles''.

In Saudi Arabia, there are two varieties; are oval with a black skin and a pinkish-ivory interior, and have a cream colour but are generally more expensive.

In oceanic countries, there is some confusion regarding the desert truffle, as the yam is often referred to as the ''common desert truffle'' as well.Tedder, M. M. Yams, a description of their cultivation on Guadalcanal in the Solomon Islands.(Noumea: South Pacific Commission, 1974) pp. xi

References

* Dıéz J, Manjón JL, Martin F. (2002
Molecular phylogeny of the mycorrhizal desert truffles (''Terfezia'' and ''Tirmania''), host specificity and edaphic tolerance.
Mycologia 94(2): 247–259.

{{Taxonbar, from=Q2932328

Pezizaceae
Edible fungi
Ascomycota families