296 FRESH-WATER ALG^E OF THE UNITED STATES. 



Phycochromes (Cyanophycece) ; it can not therefore be considered 

 incongruous to suppose that the same or similar forms may 

 develop Lyngbya ; nevertheless more evidence is sought. 



A third method of' propagation is a direct development of 

 Anabcena-forrns. See notes under the description of the genus 

 Andbcena. 



LYNGBYA AESTUARII, Liebm. 



Trichonies rigid, flexuously curved, blue green or with 

 age brownish, densely interwoven in aeruginous tufts, or 

 extended strata floating on brackish water, or spreading on 

 moist earth near the sea shores. Joints 3-4 times shorter 

 than their diameter ; scarcely constricted ; sheaths pellucid, 

 hyaline, becoming brownish; at first scarcely lamellose, 

 later distinctly lamellose. 



Diameter of trichomes, 20-28 yw. 



Forma MINUS. 



Smaller forms on soils with less moisture, but evidently 

 the same species. 



Diameter of filaments, 12-15 //. 



Plate CCII, figs. 1, 2, after specimens from Absecom, and 

 Perth Amboy, New Jersey. 



Syn. Lyngbya aeruginosa, Ag. ; L. curvata, Kab. ; L. majuscula, 

 (British Seaweeds. ) 



In brackish water, abundant near the eastern coast of 

 Jersey. 



Plate CC, figs. 11-16, from specimens collected in various 

 places near the coast of New Jersey, and in Florida. 



LYNGBYA CINCINNATA, Kg. 



Filaments floating in loosely caespitose cluster, or often 

 singly in marshy places ; in masses greenish black, often 

 faded, brownish. Trichonies aeruginous, interrupted ; ar- 

 ticulations short, 3-4-6 to diameter. Older plants distinctly 

 lamellose. 



Diameter of trichomes, with sheath, 25-30 yw. 



Has much of the appearance of the last, but is purely a 

 fresh- water plant and occurs at high elevations in Colorado ; 

 on Mt. Mansfield, Vt., and similar localities. 



It is not the plant known by the same name which occurs 

 in ditches and pools, sometimes as a Scytonema, sometimes 

 as a Chrysostigma, and sometimes assuming the character of 

 a Lyngbya. Compare Scytotwma cincinnata. 



