Netrium digitus

PENIUM, DIGITUS (EHRB.) 3RE3. - Fresh-water Algae of the United

States page 18, February 1872* (Smithsonian contribution to know-
ledge, 241) •

P* Cellulis ovato-cylindricis, diametro 3-5 plo longioribus, utro-
que polo parum attenuatis, sub-truncato-rotundatis; laminis
chlorophyllaceis peripherloe lobatis, medio interruptis.

Di«m*-13/7500" « .00173" - £2/7500" - ,0029".

Syn.-P* Digitus, (EHR3*) BRE3* BABENHORST, Flora Europ* Algar*,

Sect. Ill* p. 118«

Cells ovately cylindrical, 3-5 times as long aB broad, at each

end slightly attenuate, subtruncately rounded; ohlorophyl lamina
lobate on the periphery, Interrupted in the middle,

REMAEES*-This species is probably widely diffused through the tem-
perate portions of north America. I have found it abundantly
near Philadelphia, as well as among the Alleghanies, and have
received specimens from Dr. Lewis, collected in Saco Lake,

Northern Hew York; Prof* Bailey also notes it as occurring in
Georgia. There is one foim of it which resembles somewhat in
outline the modern coffin, one end being much broader and much
more rapidly narrowed than the other* There is no distinct vacuole
at the end, at least in any specimen I remember to have seen, al-
though frequently large numbers of moving granules can be detected
in that portion of the frond*

Fig* 6, pi* 20, represents the outline of a frond of this
species.

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