80 Messrs. Berkeley and Broome on British Hypogaous Fungi. 



nerally more expanded, and is of a fine deep lemon-yellow from 

 the exposure of the interstices of the fructifying veins, and the 

 peridium thin and brown frosted with yellow, when young of a 

 uniform gamboge-yellow. In P. melanoxanthus the veins are 

 nearly black with yellowish interstices, and the peridium thick, 

 far more coarsely warted, more compressed and irregular in form 

 and always black. The specimens received from Messrs. Tulasne 

 under the name of P. melanoxanthus are all the foregoing species, 

 but it is probable that their characters were drawn up from both 

 species, judging from their sketches of the fresh truffle. 



P. melanoxanthus is often attached laterally to leaves, sticks, 

 &c. without any connexion with the ground. 



13. Pachyphloms conglomerates, Berk, and Broome. Irregu- 

 laris lobato-plicatus conglomeratus lsevis, peridio fusco-rufo hie 

 illic prsesertim interstitiis adpressim sericeo-fibroso citrino. Near 

 Bristol, October 22, 1845. 



About an inch in diameter, shortly stipitate, much-lobed and 

 plicate a& if made up of a number of individuals, the lobes rounded, 

 of a deep brown olive. Sometimes quite even, sometimes rather 

 rough, but not the least verrucose ; interstices of the lobes clothed 

 with adpressed silky yellow fibres. Asci clavate, irregular, con- 

 taining eight globose tuberculate sporidia. Sporidia larger than 

 in the other species and differing in their appearance. 



Very few individuals of this species have at present been found, 

 but it differs very much in habit and in the total absence of tu- 

 bercles or warts on the peridium*. 



14. C 'hoir omy ces mceandriformis, Vitt. ! Mon. Tub. p. 51. tab. 2. 

 fig. 1. Tuber album, Sow. ! tab. 310. 



The original specimens of Tuber album, Sow., still remain in 

 the herbarium, and are identical with the species of Vittadini just 

 cited. Unfortunately no locality is indicated on the paper to 

 which the specimens are attached, or in the text. It has not yet 

 occurred in the extensive researches made in Wiltshire and So- 

 mersetshire. 



*Tuber brumale, Vitt. ! Mon. p. 37. 



The specimens formerly referred to T. melanosporum belong to 

 this species, as appears on the inspection of a series of specimens 

 of T. melanosporum obtained at Paris in January, where it is the 

 species usually exposed for sale in winter. 



15. T dryophilum, Tul. ! Fung. Hyp. /. c. King's Cliffe, 

 Chudleigh, Bristol, &c. 



The species referred to T. dryophilum, on an inspection of 

 authentic specimens and comparison of the sporidia, is decidedly 



* The specimens began to dissolve away after being kept two days, 

 whereas the other species will keep well for a week, nor do they then dis- 

 solve. The flesh is filled with oil globules. 



