1919] Setchell-Gardner : Myxophyceae 7 



The description given above is translated from Forti (1907, p. 26) 

 and is Sanvageaii's description of the, plant found at Ilammam- 

 Salaliin, Algeria. It ma}' be seriously questioned whether the plant 

 distributed by Gardner from the dripping sides of a water tank at 

 Berkeley, California, which was submitted (in duplicate) to Sau- 

 vageau by F. S. Collins and received his sanction, is the same as 

 no. 1552 Gardner which was found forming an irregular layer in pools 

 of a salt marsh at Alameda, California. The cells of the latter speci- 

 men are slightly smaller than those of the Berkeley specimen or as 

 given for the type. The cells of the Alameda plant are 4— 4.5/^ in 

 diameter in the strictly spherical stage and show no tegument even 

 on being treated with methylene blue. 



2. Synechococcus Naeg. 



Cells elliptical or cylindrical, single or adhering in pairs for some 

 time after cell division, free from enveloping jelly; color blue-green 

 or yellowish; cell wall tliiii ; division in but one plane; tegument lack- 

 ing, or at least extremely thin. 



Naegeli, Gatt. einz. Alg., 1849, p. 56, 



The genus 8 xjnedio coccus is closely related to the genus SynccJio- 

 cystis and the two seem to intergrade. Thej^ are both imicellular, in 

 the strict sense, with divisions in a single plane. They are both lacking 

 in tegument, but some species of Synechococcus seem to have a light 

 enveloping jelly and approach the genus Gloeothece. As in other cases 

 among the Chroococcaceae, it seems best to retain the distinction as 

 generic even though it be slight. 



The type species of Synechococcus is S. elongatus Naeg. from the 

 Katzensee near Zuricli in Switzerland. 



Synechococcus curtus Setchell 

 Plate 1, fig. 6 



Cells single or united by strands of transparent jelly, slightly 

 elongated, with obscure cell wall, and pale bluish-green protoplast; 

 cells S/x diam., 6/m long just before dividing, the pair of daughter cells 

 up to 8/A long before separating. 



Growing in warm salt water. Oakland, California. 



Setchell, in Collins, Holden and Setchell, Phyc. Bor.-Amer. 

 (Exsicc), no. 1351, March, 1907 ; Gardner, Cyt. studies Cyan., Novem- 

 ber 10, 1906, p. 239 (MS. name; no descr.). 



