26 University of California Publications in Botany [Vol.8 



3. Dermocarpa sphaeroidea 8. and G. 

 Plate 2, fig. 7 



Cells spheroidal or sliglitly obovate, somewhat angular when com- 

 pressed, solitary, or mostly grouped together in small clusters, up to 

 25/A diam. ; cell wall liyaline, homogeneous, thin, 1.5/x thick; cell con- 

 tents pale blue-green at maturity, finelj' granular; gonidangia 18-25|u, 

 diam., the whole cell contents dividing into small spherical gonidia. 



Growing on Porphyra perforata forma lanceolata along high-tide 

 level. Lands End, San Francisco, California. April, 1917. 



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

 p. 440, pi. 36, fig. 7. 



This species of Dermocarpa probably grows on other hosts than 

 that mentioned above in the same locality. Groups of cells resembling 

 those of this species have been observed intermixed with Radaisia and 

 Pleurocapsa growing on small species of EnterotnorpKa and Viva, but 

 it is difficult to determine the separate members in such a mixture. 

 The material found on Porphyra was free from other forms. It seems 

 to occupy an intermediate position, as regards its gregarious habit, 

 between D. fucicola Saunders and D. suffulta S. and G., the former 

 growing in compact colonies and the latter almost singl}^ 



4. Dermocarpa suflfulta S. and G. 

 Plate 2, fig. 9 



Cells solitarj' or loosely associated into small groups, ovoid, pear- 

 shaped or sometimes stipitate, 17-20/i, long, 10-14ju, diam. at the larger 

 end ; contents bright blue-green ; cell wall hyaline, homogeneous ; goni- 

 dangia formed from the upper part of the cell, leaving a cone-shaped, 

 sterile, basal portion ; gonidia 8-12 in a gonidangium, 4-6jU. diam. 



Growing on Rhodochortoti Rothii near high-tide limit in shaded 

 places on rock. Moss Beach, San Mateo County, California. 



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

 p. 440, pi. 36, fig. 9. 



These plants were found growing in moderate abundance in com- 

 pany with Dermocarpa hemisphaerica S. and G. and with Chlorogloea 

 conferta (Kuetz.) S. and G. Of all the known species it seems most 

 closely related to Dermocarpa Leihleiniae (Reinsch) B. and Th. It 

 differs from that species in being narrower in general, in having fewer 

 and larger gonidia, and in having a larger part of the cell changed 

 into a gonidangium. Nearly half of D. Leihleiniae remains sterile. 



