518 FOREST CULTURE AND 
Tuber albidum, Fries.—Occurs with T. estivum, 
but is smaller and less agreeable in taste. The means- 
for transferring truffles and any other edible fungi 
from one country to another require yet to be further 
studied and finally devised, but they appear quite 
feasible. 
Tuber magnatum, Pico.—Gray Truffle. South Eu- 
rope. One of the most esteemed trufiles, with some 
garlic flavor. 
Tuber rufum, Pico.—Red Truffle, especially in vine- 
yards. Much used for food, but smaller than the 
Terfezia trufiles. 
Ulmus crassifolia, Nuttall.—The evergreen Elm of 
Mexico and Texas. 
Ulmus montana, Withering. — The Wych Elm. 
Europe and extra-tropical Asia. Attains a height of 
120 feet. 
Ulmus Mexicana, Planchon.—Cordilleras of North 
America. This elm attains a height of 60 feet, or 
perhaps more. 
~ Ulmus pedunculata, Fougeraux. (U. ciliata, Ehr- 
hart.)— Europe and Asia, through their middle zone. 
A fine avenue tree. 
Ulmus parvifolia, Jacquin.—The evergreen elm of 
China, Japan, and Queensland. A similar tree is 
found in the Himalayan mountains. 
Vigna lanceolata, Bentham.—Tropical and sub-trop- 
ical Australia. Mr. O’Shanesy observes that this 
twiner produces, along with the ordinary cylindrical 
pods, others underground from buried flowers, and 
these somewhat resemble the fruit of Arachis. The 
plant is available for culinary purposes.. 
Villebrunia integrifolia, Gaudichaud. — India, as- 
