Notices of British Fungi. 509 
description of this species in the English Flora is by some mischance 
mixed up with that of Ag. pelianthinus. Both will soon be given 
in the Fasciculi of British Fungi. 
42. Ag. balaninus, n. s. On beechmast, Sept. 1836, King's 
Cliffe, Northamptonshire. An exquisite species, belonging to the 
section Calodontes of the subgenus Clitocybe, agreeing in many re- 
spects with Ag. marginellus, which appears to have been met with 
by Persoon only, and that perhaps not subsequently to the publica- 
tion of his Synopsis. That plant is, however, very much smaller, 
and grows on fir-trees. 
Pileus 1 J inch broad, convex subcampanulate, obtusely umbonate, 
at length more or less expanded, ochraceous with a slight tinge of 
amber, very minutely mealy, slightly rugulose carnoso membrana- 
ceous ; margin scarcely striate. Gills broad, rounded, quite free, 
with the exception of a connecting tooth, rather distant, pale, sprink- 
led and fringed with dull purple spiculae ; interstices veiny. Spo- 
ridia white, elliptic. Stem 2 ( ] inches high, 1-2 lines thick, atte- 
nuated downward, flexuous, rigid, white, and mealy within the pileus, 
deep Sienna brown below, dark brown at the base, which is imbed- 
ded more or less in a spongy mass, by which it adheres to the mast, 
shining, quite smooth, fistulose. 
Tab. XV. Fig. 2. a. Ag. balaninus, nat. size ; b. b.b. vertical section ; c. a 
section of the extremity of a gill highly magnified to show the spiculae ; d. 
sporidia highly magnified. 
* 43. Ag. undatus, Berk. Eng. Fl. Vol. v. pt. 2, p. 51. Brit. 
Fung. n. 9. The habitat of this species, as given in the English 
Flora, is small stumps and sticks. I now find the species very fre- 
quently in one locality, and there always upon the subterraneous 
base of decayed stems of Pteris aquilina. 
* 44. Ag. tuberosus, Bull. t. 256. Frequent opportunities of 
examining this species, under various circumstances, have convinced 
me that Acrospermum cornutum is not an autonomous fungus, con- 
trary to the opinion entertained by me -in the English Flora, but a 
mere disguised form of the plant. When growing on the gills of 
Agaricus adustus, it commences by a little white downy elongated 
granule, which gradually increases in length and breadth, becoming 
brown and quite smooth, resembling much the bulb of some species 
of Oxalis, and either gives origin at the apex to a stem and pileus, 
or suddenly stops in its growth without producing either, and re- 
mains dormant through the winter. In the first case, the stem of 
the Agaric is perfectly continuous with the tuber, as represented 
correctly, though rudely, by Bolton ; occasionally, indeed, the tuber 
