Affinities of British Tuber aceae. 251 
B. Gleba furnished with veins ; solid or lacunose. 
Spores globose, smooth ; asci cylindrical. 
Stephensia. 
Spores globose, warted ; asci elliptic-oblong. 
Pachyphlaeus. 
Spores elliptical or globose, reticulated, warted or spinulose ; asci subglobose. 
Tuber. 
Spores globose, with elongated blunt warts ; asci elliptic-oblong. 
Choeromyces. 
Ascophore with a distinct obconic base ; spores globose, warted ; asci 
subglobose. 
Terfezia. 
Spores globose, hyaline, with long, very slender spreading spines. 
Amylocarpus. 
Genea, Vitt., Mon. Tub., p. 27 (1831); Cooke, Brit. Fung., p. 747 (1871); 
Sacc., SylL, viii, p. 873 (1889). Hydnocaryon , Wallr., FI. Crypt, Germ., ii, p.86o (1831). 
Ascophore fleshy, warted, with a perforation at the apex and a tuft of mycelium 
at the base. Gleba broken up by walls into irregular cavities in communication with 
the apical opening. Asci cylindrical, 8-spored. Spores subglobose, colourless. 
Genea verrucosa, Vitt., Mon. Tub., p. 28, tab. 2, fig. 7 (1831); Cooke, Brit. 
Fung., p. 748 (1871); Sacc., SylL, viii, p. 873 (1889). G.papillosa, Berk., Ann. Nat. 
Hist., xiii, p. 356(1844); not of Vittadini. 
Ascophore very variable in shape, sulcate or variously lobed, black, minutely 
warted, apical opening often large, 0*5-1 *5 cm. diam. A set narrowly elliptical, apex 
obtuse, spores 8, uniseriate. Paraphyses filiform, septate. Spores globose or very 
broadly elliptical, colourless, warted, 25 x 20/x, or 25-30 /z diam. 
Specimen in Kew herbarium from Vittadini examined. Gleba white, basal 
mycelium short and scanty. Smell strong, unpleasant, somewhat resembling that of 
Balsamia vulgaris , Vitt. 
Hab. Clay soil, under oaks and chestnuts. 
Distr. Britain ; France ; Italy | United States. 
Genea Klotzschii, Berk, and Br., Ann. Nat. Hist., xviii, p. 78 (1846); Cooke, 
Brit. Fung., p. 748 (1871); Sacc., SylL, viii, p. 847 (1889). G. verrucosa , Klotzsch , 
in Dietr. FI. Preuss., vii, no. 474 (1833) not of Vitt., Mon. Tub., p. 28, tab. 2, fig. 7 
( i 8 3 !)- 
Ascophore irregular in form, subplicate, black, warted, attached by black fibrils 
springing from the base, mycelium abundant, white, floccose, 1-2 cm. diam. Asci 
cylindrical, apex obtuse, spores 8, uniseriate. Paraphyses very slender, longer than 
the asci, septate. Spores subglobose, colourless, rather coarsely warted, 25-30 \i diam. 
Hab. Nearly on the surface of the soil. 
Distr. Britain ; Germany. 
Gleba white or tinged yellow. Smell foetid. Most nearly allied to G. sphaerica , 
Vitt., a species not met with in Britain. 
The mycelium spreads for several inches on the surface of the ground like a cob- 
web, being densest in the centre beneath which two or three ascophores are found. 
