that it is intermediate between the Agarici and the Hydna,
and has a strong analogy with some Doedaleoe, but differs in
the hymenium being always destitute of real pores, whether regular
or irregular. Most of the other species of Sistotrema
of P e r so o n are placed under Hydnum in the Systema My-
cologicum.
In a new, laborious and learned work just published by
M. F r i e s , the genera of the Fungi, as well as those o f the
Lichens and Algæ, are carefully revised, and many new ones
proposed. In a subordinate division of the large group of Pi-
leate Fungi, or those whose Hymenium is inferior and ascige-
rous, we find the genus Hydnum and its allies arranged together,
with the character, “ Hymenium subulatum vel tuberculatum
and the following genera are enumerated, two of them
being new ;
F i s t u l i n a , Bull.— Subulæ a pileo discretæ, dem um tu b u lo so -ap e rtæ .
H ydnum, Linn.—Su b u læ coufertæ, liberæ, clausæ.
Sistotrema, F n e i.— Su b u læ e x planatæ , flexæ, lamelliformes vel cba-
racteriformes.
I rpex, Fries.—Subula; irreg u la re s , basi seriato vel re ticula to-conjunc tæ .
—Pileus dimidiatus vel resupinatus.
Radulum, Fries— H ym e n ium in te rru p tum , b in e in d e tube rculosum.
The last commets tlie hydnoid group with the Thelephoroe.
Fig. 1. S. conjiuens. Fig. 2. A confluent group, and young plants. Fig. 3.
A section o f a distinct plant; natural size. Fig. 4. Touth-like processes of
the hymenium. Fig. 5. Sporidia ; magnified.