of that genus : he accordingly discovered (by means of the
oculus internus) that it contained spherules, of which he has
given two dissections ! S o w e r b y relied on B o l t o n ’s accuracy,
and, without any dissection of the internal structure at
all, continued it in the same genus. What apology the Editor
of the last edition of W i t h e r i n g ’s Botanical Arrangement
has to offer for exhibiting the same degree of inattention, it is
impossible to conceive. The very genus Hy ste rium is not in
the work even as a synonym.
Dr H o o k e r , in his Flora Scotica, and soon afterwards
Mr P u r t o n in his Midland Flora, introduced it to this
country as an Hysterium.
Fig. 1. Hysterium Fraxini, nat. size. Figs. 2. Single plants, magnified.
Fig. 3, A transverse section. Fig. 4. Thecte and sporules.
