i 2 8 Notes on Algcs. [zoe 



strings of sterile cells, provided with a curved multicellular pedi- 

 cel, spores in strings, large and angular. 



Growing upon rocks and stones, in the lowest portion of the 

 littoral and the upper portion of the sublittoral zones, and cast 

 ashore. Santa Cruz, Dr. C. L. Anderson/, Mrs. J. M. Weeks!; 

 Pacific Grove, Mrs. J. M. Weeks!, W. A. Setchell! ; Land's End, 

 San Francisco, W. A. Setchell! ; Dillon's Beach, Marin County, 

 California, W. A. Setchell and R. E. Gibbs! ; Fort Ross, Sonoma 

 County, California. W. A. Setchell and C. P. Nott! 



Specimens of this species were apparently referred to C. 

 Sitchensis P. and R. by J. G. Agardh and by Farlow, and speci- 

 mens were distributed under this name in Farlow, Anderson and 

 Eaton, Algae Amer., Bor. Exsiccatae, No. 148, and in Collins; 

 Holden and Setchell, Phyc. Bor.-Amer., No. 150. 



WEEKSIA gen. nov. Dumontiacearum Setchell mss. Frond 

 similar in habit to that of Callymenia, orbicular to reniform, from 

 a short stipe and discoid holdfast, proliferating from the margins 

 and thus producing new blades similar in shape and behavior to 

 the original, consisting of three layers: a medullary layer of 

 coarser and finer filaments, much intertwined, and two cortical 

 layers, each consisting of large, rounded, colorless cells within, 

 and outer small colored cells arranged in short filaments vertical 

 to the surfaces. Tetrasporangia unknown. Cystocarps scattered 

 through the frond, immersed (lying in the medullary layer, 

 beneath a small opening through the cortex which is not at all 

 prominent) with the spore-mass reniform, not distinctly lobed, 

 provided with a curved pedicel composed of several cells (on its 

 inner side) from which arise branching filaments whose outer 

 cells develop into spores. 



A genus with the habit of Callymenia, but the cystocarp of the 

 Dumoutiacese as understood by Schmitz. Named in honor of 

 Mrs. J. M. Weeks, an indefatigable and discriminating collector 

 of our Algae, who first detected and insisted upon the distinctness 

 of the only species. 



Weeksia reticulata Setchell mss. Frond ample, broadly reni- 

 form up to 30 cm. in diameter, of a rose pink to a dark red color, 

 soft and fleshy, adhering well to paper when drying, with many 



