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tema Mycologicum of F r i e s . I t ought to be mentioned, however,
that this latter botanist had also found it, and named it
in his MS. P . Equiseti, being willing to retain the specific
name bestowed upon tbe plant by H o f f m a n n , who had previously
described it as a Lycoperdon. That H o f f m a n n had
done so, seems to have escaped P e r s o o n altogether, since he
has published it as a new plant.
Its duration is, I apprehend, short, but all seasons seem
nearly indifferent to it. F r i e s mentions it as occurring in
spring and summer, and I have found it plentifully in the autumn.
Fig. 1. P. Persoonii, nat. size. Fig. 2. A group magnified. Fig. 3. Young
plant. Fig. 4. A mature plant. Fig. 5. A mature plant, o f a different
form. Fig. 6. A plant dissected. Fig. 7- Sporuliferous cells. Fig. 8.
Sporidia.— A ll except Fig. 1. more or less magnified.
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