Ilatum,
P e r s . ) , that both Captain C a r m i c h a e l and myself
referred it at once to that species; nor was I aware of the error
till I received authentic specimens from my friend M. F r i e s
himself Still, I have not seen the true Hydnum spatliula-
tum, and cannot help entertaining a suspicion, that the subject
of the present description may be too nearly related to it.
Radulum is a genus proposed hy F r i e s , for receiving those
Hydna which have an interrupted hymenium; the true H y d na
having their subulate processes crowded and free. Another
genus is also introduced hy the same author, between Hydnum
and Radulum; namely Jrpex, in which the subulate processes
are connected at their bases seriatim, or hy a kind of net-work.
Hydnum and Irpex are connected by Radulum with Thelephora,
one or two species of which more properly belong to it
than to the la tte r; especially the one cited hy F r i e s , Thel.
hydnoidea.
Fig. 1. Radulum orbiculare, natural size. Fig. 2. A young plant.
Processes o f the hymenium. Fig. 4. Extremities o f two processes.
Sporidia ; magnified.
Fig. 3.
Fig. 5,
|i!