Rhaphidium polymorphum Fresen.

RHAPHIDIUM, KIZ. PQLIMORPHUM, FR2SEH.- Fresh-water Algae of the

United States page 18, February 1872* (Smithsonian oohtribution

to knowledge, 241)•

B. Gellulis rectis vel varie curvatis, singulis, vel 2-4-8-16 fascicu-
latim oollooatis, graoilibus, saepe gracillimis, nonnunquam medio
paullum turgidis, subventrioosis, nonnunquam paullum constrictis,
apiee versis, sensim attenuatis, acutissimis.

Diam#-i/?500 = 00013».

Syn.-H. polymorphum. FBESEN*, BABBNHOBSÍ, Flora Europ. Algarrtm, Sect.
Ill# p. 44*

Hab.-Prope Philadelphia, Wood*

Cells straight or variously curved, single or 2-4-8-16 fasciculately
joined together, slender, oftern exceedingly so; sometimes slight-
ly turgid in the centre, subventricose, sometimes slightly constrict-
ed; the apices gradually attenuate, very acute.

Var. FALCATUM.

Cellulis fusiformibus, gracillibus, utroque fine aoutissime cuspi-
dstis, curvatis vel semilunaribus, 4-16 fasciculatim congregatis.

Syn.-Ankistrodemu8:ie alca tus.	BABEEHOBST, Flora Europ. Alga mm,

Sect. XXX. p. 45.

Hab.-South Carolina, Georgia, Florida, Hhode Island. (Bailey.i

Cells fusiform, slender, at each end very acutely cuspidate, curved
or semilunar, 4-16 fasciculately congregate

BElíáBK.-Fig. 3, pi* 7, represents different fozms of B* polymorphum*

•ifón Fig. 3. RHAPHIDIUM POLYMORPHUM.

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