215 
Lemaneaceae of the United States . 
Sird’t., Ann. d. Sci. Nat 5th Ser. Bot. 1872; Wolle, Fresh 
Wat. Alg. U. S. 1887; Born’m., Beit. z. Kennt. d. Leman. 
1887. 
Trichogonus Palisot ; see Desveaux, Jour. Bot. p. 124, 
1808. 
Vertehraria Rouss. ; see Desv., Jour. Bot. i. p. 143, 1808. 
Nodularia Link, Neues Jour. Bot. p. 9, 1809 ; Lyngb., Tent. 
Hydrophyt. dan. p. 99, 1819. 
Gongycladon Link ; see Jahresb. ii. d. Arb. f. Phys. 
Bot. vi. 
Sacheria Sird’t., Ann. d. Sci. Nat. 5th Ser. Bot. 1872; 
Born’m., Beit. z. Kennt. d. Leman. 1887. 
Entothrix Wolle, Bull. Torr. Bot. Club, p. 183, 1877. 
Tuomeya Wolle, Fresh Wat. Alg. U. S. ex parte, 1887. 
Characters those of the family. 
Subgenus LEMANEA. 
Antheridia in bands, regular or interrupted, around the 
antherid-zone. Procarps of five to ten cells, always developed 
in the middle of the procarp-zone, never so near the antherid- 
zone as in the subgenus Sacheria ; ray-cells simple, not reach- 
ing the wall ; central axis soon surrounded with slender fila- 
ments developed from the lower face of the ray-cells ; generative 
filaments far separated from the wall except in the antherid- 
zone, normal number at first six above and eight below the 
ray-cells, soon becoming eight above by the branching of two 
opposite first cells : cortex sometimes in two to three layers of 
cells developed serially; basidia (first cells of ooblastema-fila- 
ments) short, oval ; hypogynous cells of the procarp producing 
short-celled filaments (paraphyses ?) at time of fertilization ; 
prostrate form of the protonema mainly confervoid. In 
turbulent water, or rather slow running water of strong 
streams. 
1. Lemanea annulata Kiitz. 
Lemanea annulata , Kiitz., Species Alg. et Tab. phyc. 
