26 o 
Massee . The Structure and 
Exsicc. Roumeg., Fung. Gall., 2816. 
Tuber scleroneuron, Berk, and Br., Ann. Mag. Nat. Hist., vii, p. 184 (1851); 
Cooke, Brit. Fung., p. 740 (1871) ; Sacc., Syll., viii, p. 887 (1889). 
Ascophore subglobose, somewhat lobed, cartilaginous, minutely warted or some- 
times almost smooth, cracked, reddish-brown, 2-4 cm. diam. Gleba greyish towards 
the centre, becoming reddish-brown towards the periphery. Asa broadly ovate or 
clavate, shortly pedicellate, 2-4- usually 3-spored. Spores subglobose or broadly 
elliptical, brown, densely bristling with slender spines 4-6 1 x long, often slightly 
curved at the tip, 17-23 X 25 fx. 
Berkeley says the spores are c minute cellulosa ’, meaning that they are minutely 
reticulated. An examination of his type specimens in the Kew herbarium, however, 
shows that the epispore is spinulose, as stated above. 
‘ This species differs from Tuber rufum, Vitt., in its firmer cartilaginous texture* 
deep red-brown colour, and in the form of its sporidia, which are ovate, not elliptic- 
elongate, and in its faint aromatic odour. When dried, Tuber scleroneuron becomes 
as hard as a piece of wood/ Berk. 
Hab. In the ground. 
Distr. Britain. 
Tuber intidum, Vitt., Mon. Tub., p. 48, pi. 2, fig. 10 (1831) ; Cooke, Brit. Fung., 
p. 741 (1871); Sacc., Syll., viii, p. 897 (1889). Tuber Berkeley anum, Tub, Hypog., 
p. 151 (1851). Oogaster Berkeleyanus , Corda, Icon. Fung., vi, p. 71, pi. 16, fig. 118 
(1854)- 
Ascophore globose or slightly depressed, hard, even, shining, just tinged yellowish- 
red, 1-5-3 cm - diam. Gleba at first whitish then reddish-brown, hard, dissepiments 
whitish, originating from a pale point at the base. Aset obovate or variable in form, 
2-4-spored. Spores broadly elliptical or subglobose, yellowish-brown, densely covered 
with rather long, slender spines, 20-30 x 15-24, or 20-25 n diam. 
Distinguished by the even, polished ascophore and the small, spinulose spores. 
The asci vary in form according to the grouping of the spores, sometimes four are 
arranged as a tetrahedron, sometimes two or three more or less in a straight line. 
Specimen from Vittadini, in Herb. Kew., examined. 
Hab . Underground, under trees. 
Distr. Britain ; Italy. 
Exsicc. Berk., Brit. Fung., 303 ; Roumeg., Fung. Gall., 2171. 
Tuber ferrugineum, Vitt., Mon. Tub., p. 46, pi. 3, fig. 10 (1831); Tub, Hypog., 
p. 141 (1851); Sacc., Syll., viii, p. 897 (1889). 
Ascophore variable and irregular in shape, very soft, rusty brown, minutely 
warted, often sparingly cracked, 4-9 cm. diameter. Gleba soft, dry, granular, pale 
rusty brown, traversed by a few slender, sparingly branched dissepiments of a whitish 
colour. Asci numerous, subglobose or obovate, 2-4-spored. Spores elleptical or 
sometimes almost globose, brown, densely covered with slender spines, 18-25 x 
15-18 ix. 
This species is characterized by the very soft ascophore. Becoming hard when 
dry, smell somewhat strong. 
Hab. Underground. 
