Family — Tubera´ceæ
Subterranean; ascophore irregularly globose, usually large, not rupturing.
To this family belongs the Truffle of commerce renowned for its flavoring qualities. It has not yet been found in America, though several fungi are ignorantly bought in our markets under that name; notably Coprinus comatus or maned mushroom. The writer has frequently been informed with all the logical force of genuine market-women that this was the real Truffle, because they raised it themselves.
Until quite recently but one species of Truffle has been reported as growing in America. This, Tuber niveum Desf. or Terfezia leonis Tul. was found by Rev. A.B. Langlois, St. Martinville, La. He reported it as growing plentifully, buried or nearly so in the red sand land along the Red river near Natchitoches. He writes me: “The people where it is found are looking for it with great care and are eating it with great relish. I had occasion to eat it once and I found it delicious.” He kindly sent the original illustration from which the accompanying drawing was made. It was taken from Jour. Myc., January, 1887, J. B. Ellis, who first published a description of the American representative of the species. He describes it as “subglobose, up to full two inches in diameter, strongly plicate or furrowed below, nearly smooth and pale reddish-brown outside, marbled-white within and of compact texture much like a potato, but softer. When first dug from the ground the color is pure white, the reddish tint being due to exposure to the air. The asci obovate or subglobose, 75–80×60–70µ. Each contains eight globose spores, thickly clothed with obtuse, elongated, wart-like tubercles and about 20µ in diameter. The home of the white Truffle is said to be in Northern Africa, though it is not uncommon in Southern Europe, where its growth is favored by mild winters.”
It is probable that the Truffle will be found in other southern states. Perhaps in the north, as Fries reports that two specimens were found near Linkoping, Sweden, and Mr. H.W. Harkness reports Tubers in the Sierras at the height of 7,000 feet. It is worth hunting for.
It is possible that the common Truffle—Tuber æstivum—will be found in America. Fame awaits the finder. A description of it with illustration is therefore given.
Tuber æsti´vum Vitt. Peridium warty, of a blackish-brown color, the warts polygonal and striate; flesh transversed by numerous veins; asci 4–6-spored; spores elliptical, reticulated.
This plant, the common Truffle of our markets, is abundant in Wiltshire and some other parts of England, and probably occurs in many places where it escapes observation from its subterranean habit. Badham.
It is cultivated largely in France. “Perigord Truffles” are a costly delicacy. The Truffle is of subterranean habit, growing under various kinds of trees and from 12–48 in. under ground. As it does not manifest its presence above ground, dogs and pigs are trained to find it by scent. An interesting chapter on Truffles will be found in British Edible Fungi, M.C. Cooke, 1891. Any plant of similar habit, when found, should be immediately sent by the finder to a known expert for identification.
Thirteen species of Tuber and several Terfeziæ are reported in California, and are described and beautifully illustrated in “California Hypogæous Fungi” by H.W. Harkness, “Proceedings of the California Academy of Sciences,” 1899.
Terfezia spinosa Harkness closely resembles T. leonis Tul., and T. (sphærotuber) Californicum n. sp., found under oaks beneath vegetable humus in Alameda county, Cal., Professor Harkness remarks, is nearly identical with an edible species found in Italy. All species found in California are said to be edible, but to be too rare to be of food value.
There is a well known growth, found from New Jersey south to the Gulf and west to Kansas, called Tuckahoe (Pachyma cocos), (Plate CLV), an Indian name meaning a round loaf or cake, and famed for its edible qualities. Its exact place in plant growth has been variously determined. It is now conceded that it is the sclerotium or cellular reservoir of reserve material of some fungus. It is usually found attached to the roots of trees, in low marshy places. It grows several feet below the surface, and to the size of a man’s head. It varies in shape, being oblong or round, having a coarse brown covering, looking like a cocoanut. Its interior is white, compact, without cellular structure; it has no mycelium or trace of fructification. It contains as high as 77 per cent. of pectose and is therefore highly nutritious.
For full accounts see Torrey Bulletin, October, 1882; Smithsonian Inst. Rep., 1881, p. 693; article by Professor J. Howard Gore; also Garden and Forest, IX, p. 302.
The illustration is after that in the Century Dictionary, “Tuckahoe.”
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