FALSE TRUFFLES 
59 
the last century, but not obtainable there now. It occurs 
in twos and threes—usually partly exposed—chiefly under 
beeches and Lombardy poplars, in sum. and aut. 
HYDNANGIUM 
(Gr. hudnon , a truffle or tuber; aggeion, a vessel—from the 
tuberous form) 
H. carotsecolor ( cavota , carrot—from the colour). Plate 
XVII. 13. 
Per. i|- in., irregularly oblong, reddish; carrot-colour 
within. In woods and under trees on downs in aut. and win. 
Often exposed. 
HYSTERANGiUM 
(G. hustera , the womb; aggeion , a vessel—from the shape) 
H. nephriticum (Gr. nephvos , the kidneys—from the 
supposed resemblance of a section to a kidney). 
Per. | in., irregularly globose, indented, firm, tomentose> 
white becoming reddish when bruised. Section pale blue 
or grey, here and there greenish, the cells radiating from the 
base. In woods, chiefly on clay soil, aut . and win. Usually 
buried 8 or 9 in. Smell strong at maturity, like rotting 
puff-balls. 
RHIZOPOGON 
(Gr. rhiza, a root; pogon, a beard—from the tuberous growth 
and attached fibres) 
R. rubescens ( rubescens , becoming red—from" the reddish 
tint when bruised). Plate XVII. 15. 
Per. ij in., irregularly subglobose, white at first, then 
yellow or olive-brown, becoming reddish when bruised. 
Frequent in aut. and early win. in sandy fir woods. 
Gregarious, either exposed or buried several inches. 
