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Notice.

The publication by Mr. Cassino of "Characeae Americanae," and of
"The Characeae of America" has been suspended; and, in their place, descriptions
and illustrations of new species and their related forms will be undertaken.
The plates will be prepared in such a manner, and of such a size,
that they may be used to illustrate a complete work on "The American
Characeae," which will be prepared and issued after a careful examination of
our waters shall have been made, and a knowledge of our species obtained.

In order to excite an interest in these obscure plants, and to assist
in their identification, "Exsiccatae" are being issued. Sets of these
are not for sale, but may be obtained by the contribution of specimens
to it. Any one desiring a set may contribute about 100 specimens of a
desired species or variety. The more delicate species should be floated (like
Algae) on white paper; the coarser forms may be pressed like ordinary
plants; but, if very brittle, they should be glued down. Three Fasciculi
have been issued already, comprising the following species and varieties:

Fasciculus I. — Nitella tenuissima, Desv. (forma brevifolia); N. intermedia,
Ndst., n. sp.; N. megacarpa, Allen, n. sp.; Chara intermedia, A. Br. (forma
tenuior elongata); A. Br., var. Americana, A. Br.; Ch. contraria,
A. Br. (forma brachyphylla, humilior); Ch. sejuncta, A. Br. (forma elongata);
Ch. coronala, Ziz., var. Schweinilzii, A. Br.; Ch. gymnopus, A. Br., var.
Michauxii A. Br.; Ch. Hydropilys, Ndst., in litt.

Fasciculus II. — Chara coronala, Ziz. (forma microcarpa microptila
verticillata) var. gracilis, Allen; Ch. coronata, Ziz. (forma meiocarpa meioptila,
partim verticillata); Ch. coronala, Ziz. (forma macrocarpa, meioptila, verticillata);
Ch. coronata, Ziz. (forma macrocarpa, marcoptila, verticillata,
zonulare incrustata); Ch. excelsa, Allen; Ch. evoluta, Allen; Ch. foetida, A. Br. (forma brachyphylla, clausa, elongata, macroteles); Ch. foetida, A. Br. (forma
incrustata laxior); Ch. contraria, A. Br.; Ch. fragilis (forma tenuifolia, microptila, munda, humilior.

Fasciculus III. — Chara fragilis (forma microptila incrustata, laxior); Ch.
delicatula, Ag.; Ch. gymnopus, var. elegans, A. Br.; Ch. gymnopus, var. Humbokltii,
A. Br. (forma stolonifera!); Ch. sejuncta, A. Br. (forma condensata,
robustior); Ch. aspera, Willd.; Ch. aspera, Willd., var. Macounii, Allen; Nitella
flexiiis, Ag.; N. flexilis, Ag. (forma longifolia, elongata); N. flexilis, Ag., var.
subcapitata, A. Br.

Correspondence invited.

T. F. Allen, M. D.,
10 East 36th St., New York City.