1919] Setchell-Gardncr : Myxophyceae 17 



pi, 38, fig. 8, and also below), and we believe this to have been the 

 plant of Tilden. Further search has, however, failed to reveal a true 

 Chlorogloea; althou^rh tlie impression still prevails witli us that one 

 may be present. 



2. Chlorogloea conferta (Kuetz.) S. and G. 



Plate 2, fig. 6 



Colonies forming tubercular masses of indefinite shape and size; 

 cells angular, 0.8-1.2/a diam., slightly longer than the diameter, 

 embedded in a dense, copious, gelatinous matrix of light yellow color, 

 arranged in no definite manner; contents very pale blue-green with 

 hyaline center; reproduction vegetative; cell divisions in all directions. 



Growing on Khodochorton Rothii in company with Dermocarpa 

 hemispherioa and Dermocarpa sujfulta along high-tide level in shaded 

 places. Moss Beach, San Mateo County, California. 



Setchell and Gardner, in Gardner, New Pac. Coast Alg. II, 1918, 

 p. 4.32, pi. .36, fig. 6. Palmclla conferta Kuetzing, Phyc. Gen., 1845, 

 p. 149, Tab. Phyc, 1846-49, p. 12, pi. 16, fig. 4. Pleurocapsa conferta 

 (Kuetz.) Setchell, Alg. novae I, 1912, p. 229. 



Chlorogloea conferta has been the subject of discussion among 

 algologists for some time and differences of opinion that have been 

 expressed are probably due to dift'erent interpretations as to what 

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

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

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

 material growing on " CaUithamnion Rothii" through the courtesy of 

 Dr. Weber-van Bosse. We find two species of Myxophyceae very 

 intimately associated on the host plant. One consists of masses of verj' 

 small cells embedded in a firm gelatinous matrix, varying mucli 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/a in 

 diameter, of bright blue-green color, and very frequently surrounded 

 entirely by the preceding. Doubtless it was one of these which Kuetz- 

 ing took as the type of his P. conferta, and it remains to decide which 

 one. Careful measurements of the specimens at hand compared with 

 the measurements given by Kuetzing, "1/700"' gross," leads to the 

 conclusion that his measurements refer to the gelatinous, smaller-celled 

 form, whose cells we find to measure about Iju, in diameter, instead of 

 the larger, more conspicuous form. This form seems to be very close 



