Lemaneaceae of the United States . 221 
were determined by Wolle as Tuomeya grande. Mr. Green 
kindly sent me some specimens. They probably belong to 
L. australis Atk. 
Subgenus Sacheria. 
Antheridia in well-defined patches, rarely confluent, antherid- 
zone plane or papillate ; procarps of 3-4 cells, always de- 
veloped in and near the antherid-zone, in some species also 
borne in the middle of the procarp-zone ; ray-cells T- or re- 
shaped, the arms closely applied to the wall ; generative 
filaments closely applied to the wall throughout their entire 
length, normal ones at first four above and four below the 
ray-cells, becoming six above by branching of the first cell 
of two opposite filaments ; basidia (first cells of ooblastema- 
filaments) elongate, cylindrical ; hypogynous cells of the pro- 
carp naked ; prostrate form of protonema mainly cellular. In 
very turbulent water. 
6. Lemanea (Sacheria) fluviatilis Ag. 
Conferva fluviatilis Linn. 
Polysperma fluviatilis Vauch., Hist. d. Conferv. 1803. 
Chantransia fluviatilis D. C., Flore Frangaise, vi. 1805. 
Lemanea corrallina Bory, Ann. d. Mus. 1808. 
Lemanea fluviatilis Ag., Spec. Alg. 1824-28 ; Kiitz., Spec. 
Alg. et Tab. Phyc. 1849; Rabh., Flora Europ. iii. 1864-68. 
Sacheria fluviatilis Sird’t., Ann. d. Sci. Nat. 1872. 
Chantransia- form in dense tufts, branches alternate, final 
branching sometimes opposite or fasciculate, pilose. 
Sexual shoot confined to the lower cells of the Chantransia - 
form, or in the middle branching, of a dark violet color, 
generally blacking when dry, usually reddening the water in 
which they stand, long, slender pedicelled, often simple, fre- 
quently branched, branches often fasciculate. Procarp-zone 
cylindrical. Antherid -papillae in verticils of 3-4, little 
prominent, rather distant and regular but nearer towards 
the distal end. Procarps developed all along the generative 
filaments from the first cell as well as from the cells in the 
antherid-zone. 
