Termitomyces
Termitomyces is a genus of basidiomycete fungi belonging to the family Lyophyllaceae. There are 30-40 species in the genus, all of which are completely dependent on termites to survive. They are the food source for a subfamily of termites, the Macrotermitinae, who enjoy an obligate symbiosis with the genus similar to that between "Atta" ants and "Attamyces" mushrooms. Despite this relationship, spore transfer is still accomplished mainly by shedding from mushrooms, which protrude from the termite mounds. Characteristics. These mushrooms are edible for most people, and the larger species are a popular wild food where they occur. They  include the largest edible mushroom in the world, "Termitomyces titanicus" of West Africa and Zambia, whose cap reaches 1 metre (3.28ft) in diameter. These fungi grow on 'combs' which are formed from the termites' excreta, dominated by tough woody fragments. "Termitomyces" was described by Roger Heim in 1942. From 1955 to 1969 Arthur French worked in Uganda (as a hobby) on the subject of fungi and termites. Some scientific literature about these fungal species existed previously, but these texts failed to adequately discuss the relationship between termites and their fungal symbiotes, while the various edible varieties were merely termed  termite mushrooms. French conducted some investigations with the help of the elderly Baganda women who gathered termite mushrooms, and published his findings. Culinary use. This genus is a popular seasonal delicacy in the Indian state of Goa. For about two weeks at the beginning of August every year, clusters of villagers dot the Goan roadside hawking the handpicked mushrooms. A spicy gravy known as "Tonak" is a popular method of preparation. Since "Termitomyces" mushrooms are difficult to mass produce, they command a high price. References. See Tobias Frøslev's "Termitomyces" page And an academic review of the relationship in Patterns  of interaction specificity of fungus-growing termites and "Termitomyces" symbionts in South Africa Aanenet DK al BMC Evol Biol. 2007; 7: 115.