Affinities of British Tuber aceae. 247 
amount of attention paid to the subject, and does not in any sense indicate 
the actual distribution of either genera or species. 
Europe. 
Asia. 
Africa . 
America. 
Australasia. 
*Amylocarpus .... 
1 
*Balsamia ...... 
5 
4 
*Choeromyces. .... 
6 
Cryptica ...... 
1 
Delastria ...... 
1 
*Elaphomyces .... 
2 4 
Genabea 
2 
1 
*Genea . 
11 
2 
1 
Geopora 
2 
4 
Gyrocratera 
1 
*Hydnobolites .... 
4 
1 
Hydnocystis 
4 
1 
*Hydnotrya 
3 
1 
Leucangium 
2 
Lilliputia 
1 
Myrmecocystis .... 
2 
*Pachyphloeus .... 
4 
Phaeangium 
1 
Picoa ....... 
1 
1 
Piersonia 
2 
Pseudogenea 
1 
Pseudohydnotrya . . . 
3 
*Stephensia 
2 
1 
*Terfezia 
10 
3 
6 
Terfeziopsis 
1 
Tirmania 
2 
*Tuber 
55 
3 
10 
140 
6 
12 
25 
Genera preceded by an asterisk (*) are British. 
Habitats. 
Various members of the Tuberaceae are not uncommon in England, 
nevertheless, the group is not infrequently entirely omitted from county 
lists of Fungi. Notwithstanding the fact that the Essex Field Club have 
for the past thirty years held annual Fungus Forays in Epping Forest, 
two members of the Tuberaceae were added to the list of Essex Fungi for 
the first time, last year. 
Truffles prefer a soil consisting of clay mixed with sand and ferruginous 
particles, or a rich mixed alluvium. The soil must be porous to secure the 
proper amount of aeration. Sour soil or the presence of stagnant water is 
fatal. It is a prevalent opinion that truffles are met with only under beech 
trees, this however is a mistake. They occur in open woods of chestnut, 
oak, or beech, also in open woodland districts, in soil consisting of a mixture 
of humus and sand. The presence of truffles is often indicated in the 
places where they grow, by a slight cracking or upheaval of the soil, more 
especially under the drip of trees. The late C. E. Broome, to whose 
researches first and only records of many of our British species are due, 
