1918] Gardner: New Pacific Coast Marine Algae II 433 



Chlorogloca conferta has been a subject of discussion among 

 algologists for some time, and differences in opinions that have been 

 expressed are probably due to different interpretations as to wliat 

 plant Kuetzing had in mind when he described Palmella conferta, the 

 description being brief and the type material being a mixture of small 

 plants. I have been enabled to examine a small portion of his type 

 material growing on " CaUithamnion Rothii" through the courtesy 

 of Professor W. A. Setchell wlio procured it from Kuetzing 's 

 herbarium through the courtesy of Mme. Weber-van Bosse. I find 

 two species of Myxophyceae very intimately associated on the host 

 plant. One consists of masses of very small cells embedded in a firm 

 gelatinous matrix, varying much in shape and size, of a pale yellowish 

 green color, wholly or only in part surrounding the filaments of the 

 host plant. The other consists of cells, distributed either in small 

 groups or singly, from 5-15/x in diameter, of bright blue-green color, 

 and very frequently surrounded entirely by the preceding. It was 

 no doubt one of these which Kuetzing took as the type of his P. con- 

 ferta, and it remains to decide which one. Careful measurements of 

 the specimens at hand compared with the measurements given by 

 Keutzing "1/700"' gross" leads to the conclusion that his measure- 

 ments refer to the gelatinous, smaller celled form, whose cells I find 

 to measure about 1/x in diameter, instead of the larger, more con- 

 spicuous form. This form seems to be very close, if not identical, with 

 the plant commonly associated with the same host plant on both the 

 Atlantic and the Pacific coasts of the United States. It is also usually 

 accompanied by other species of Myxophyceae. 



The genus Palmella as now restricted includes onl}- forms of 

 Chlorophyceae, hence it will be necessary to reject that name and 

 adopt another for this widely distributed plant which seems to be 

 on the border between the Bacteria and the Myxophyceae. Setchell 

 (1912, p. 229), with special reference to the larger cells has referred 

 the plant of Kuetzing to Pleiiro&apsa, but tlie smaller celled plant is 

 not properly referred to that genus. Wille has created the genus 

 Chlorogloea to receive a plant very similar to ours, and known as 

 Palmella ? tuhercnlosa Hansgirg (1892, p. 240) and this generic 

 name is here adopted. 



Chlorogloea conferta differs from C. tuhercnlosa in the size of the 

 cells, in their arrangement, and in the number of planes of cell divi- 

 sions, C. tuberculosa dividing in but one plane according to Wille. 

 The other species of Myxophycae found on the material of Kuetzing 's 



