138 



DISCOMYCETES 



[CH. IV 



The ascocarps of many species of Tuber are edible, the most esteemed 

 being T. nielaiiosporum. which does not occur in Britain. They grow chiefl}- 



^J^%?^ 









Fig. 99. Tuber puberiiliim (B. and Br.) Ed. Fisch. ; 



-«. development of ascocarp; <?. x 52; 



^. and c. X 28 ; d. and e. x 21 ; _/". section through mature ascocarp, x 6 ; all after Bucholtz. 



in soils consisting of sand mixed with clay and containing iron, or in mixed 

 alluvium ; the soil must be porous to secure sufficient aeration. 



Truffles occur in chestnut, oak, and especially beech woods and there is 

 evidence that they form mycorhiza with the roots of these trees. The relation 

 would appear to be of advantage to the fungus since the success of the culti- 

 vation of edible truffles under oaks in prance depends on keeping the roots 

 near the .surface. 



TUBERACE.'^E : BIBLIOGRAPHY 



1903 Bucholtz, F. Zur Morphologie und Systematik der Fungi hypogaei. Ann. Myc. i, 

 p. 152. 



1905 Faull, J. H. Development of Ascus and Spore Formation in Ascomycetes. Proc. 

 Boston Soc. Nat. Hist, xxxii, p. 77. 



1906 BOULANGER, E. Notes sur la Truflfe. Soc. Myc. xx-xxii, pp. 77 etc. 



1908 Bucholtz, F. Zur Entwickelung der Choiromyces Fruchtkorper. Ann. Myc. vi, 



P- 539- 



1909 Massee, G. The Structure and Affinities of British Tuberaceae. Ann. Bot. xxiii, 

 p. 243. 



1910 Bucholtz, F. Zur Entwickelungsgeschichte des Balsamiaceen-Fruchtkorpers nebst 

 Bemerkungen zur Verwandtschaft der Tuberineen. Ann. Myc. viii, p. 121. 



