Rev. M. J. Berkeley on British Fungi. 349 



by specimens. I must also plead guilty to uot having observed 

 sufficiently the differences between the sporophores and adjacent 

 cells in the several species, which has arisen in great measure 

 from not being able to examine the specimens on the spot at the 

 exact moment when these bodies were in perfection, and before 

 the external characters had become at all disguised. Indeed, 

 under the most favom'able circumstances to do so, requires much 

 patience and some discrimination. 



296. Hi/menog aster albus ; Hymenangium album, KL! Fl.Regn. 

 Bor. t. 466 ; Rhizopogon alhus, Eng. Fl. vol. v. pt. 2. p. 229 (ex- 

 clusis omnibus synonymis). 



This has been found at Glasgow only. The single individual 

 in Sir W. J. Hooker's collection accords perfectly with German 

 specimens kindly communicated by Klotzsch himself. It is quite 

 distinct from any of the other British species. It is not exactly 

 known what Bulliard's Tuber album is, but I suspect it will prove 

 to be the same species with a truffle collected by Dufour in the 

 west of France, and respecting which he has published some ob- 

 servations in a Departmental Agricultural Journal, to which I 

 am not able at this moment to refer. Sowerby's Tuber album 

 must also be regarded at present as very uncertain. I have 

 tried in vain to procure it. 



297. H. tener, n. s. Parvus, globosus, mollis, externe albus 

 sericeus pericho tenui interne pallide roseus, demum umbi'ino- 

 griseus, basi absorbente manifesta alba ; cellulis laxioribus ; sporis 

 parvis late ellipticis papillatis minute verrucosis. H. lilacinus, 

 Berk. Brit. Fung. Fasc. 4. no. 305. Abundant about Rudloe, 

 Wiltshire. Found also sparingly at Hazlebeech, Norths, C. E. 

 Broome, Esq., spring and summer. On the surface of the ground 

 in beech and fir plantations. Here and there one is buried in the 

 earth. The plant is always covered by moss or dead fir-leaves, so 

 as not be visible till the ground is raked. 



About the size of a bean or large hazel-nut ; globose, soft and 

 tender, white and silky externally; peridium thin, at length 

 dingy, at first white within, but soon acquiring a delicate pink 

 tinge, which, as the spores ripen, changes to an umber-gray. 

 Absorbing base white, very distinct, exactly as in Tuber nitidum. 

 Cells looser than in H. olivaceus. Spores much smaller than in 

 the neighbouring species, broad, elliptic, with a minute papilla, 

 never acuminate, minutely verrucose. Smell like that of Ag. 

 theiogalus. When inclosed in numbers in a box they give out a 

 disagreeable suffocating odour. Decayed specimens have a strong 

 smell like that of old mushrooms. 



I at first referred this to H. lilacinus with the sanction of 

 Messrs. Tulasne, but I am now convinced that it is quite distinct. 

 The form and size of the sporidia are very constant, and quite 



