LYNGBYA. 301 



dissepiments delicately granulated, apex somewhat atten- 

 uated, now and then somewhat curved. 



Diameter of filaments variable, 5-9 //. 



Kirchner makes the following four of Kuetzing's species, 

 forms of Lyn. vulgar is ^ viz. : 



Myochroa, Kg., stratum blue-black 5 fusca, Kg., stratum 

 dark-brown; lutea. Kg., stratum yellow-brown; publ'n-d, 

 stratum aeruginous. 



Syn. Phormidium vulgare, Kg. ; Osettlaria autumnalis, Eng. Fla. ; 

 Conferva decorticans, Dillw. ; OscUlaria decorticam, Grev. 

 Fla. Edin. ; Humida decorticans. Gray. 

 Frequent on moist soil from Maine to Florida. 



Plate CCI, figs. 14-20, parts of filaments from various 

 localities. 



LYNGBYA JULIANA, Menegh. 



Fasciculately caespitose, blackish green, dull violaceous 

 or pale steel color ; more or less radiating ; trichomes some- 

 what flexuously curved ; internally frequently interrupted ; 

 articulation *-i as long as wide ; apices attenuated, straight, 

 obtuse. 



Diameter of filaments, 5-6 ^. 



Syn. Phormidium Julianum, Bab. 



Sandy soil, somewhat influenced by marine waters, 

 Florida; Alabama. 



Plate Oil, figs. 20, 21. 



LYNGBYA TINCTORIA, Kg. 



Forming a purple stratum ; or dried, violet steel ; substra- 

 tum ineinbranaceous, lamellose, faded. Trichomes fascicu- 

 lately congested, long, waving ; apices more or less atten- 

 uated ; articulations primarily twice as long as wide, later 

 subequal ; cytioplasm granulate aeruginous. 



Diameter of filaments, 8-9 /*. 



This properly represents a river plant of Sweden and 

 Norway. It has much in character with our L. Phormidium, 

 var. rivularis. The plant here represented is from Arizona 

 and was identified from a dried specimen, having for guide 

 merely diameter of filaments, length of cells, and color. 

 Needs farther observation. 



Plate CCII, figs. 22, 23, filaments from Arizona specimen. 



