191-4] Setchell: The Scinaia Assemblage 97 



size, of a honeycomb-like appearance. Both the species referred here 

 are North Pacific Ocean as to their distribution and have fewer 

 colored cells scattered through their epidermis than the species here 

 taken to be true Scinaia furcellafa. Both species, also, are decidedly 

 more robust than Scinaia furccUata. 



Scinaia Johnstoniae sp. nov. 



Plate 11, figs. 14, 15. 



Scinaia furcellata var. undulata M. A. Howe, Bull. Torrey Botan. Club, vol. 38, 

 p. 502, 1911 (not Ginnania undulata Mont.). 



Plants dark red purple, 8-12 cm. high, 7-8 times dichotomous, 

 cylindrical, continuous, broad, 3-5 mm. in diameter (dried) ; branches 

 attenuated downwards; axils narrow; axis obscure (dried) ; cystocarps 

 minute but visible, scattered ; — axial strand loose, broad, of a few 

 larger filaments and a loose diffuse admixture of slender filaments; 

 epidermis of large colorless flat-topped cells, or utricles, with few, 

 scattered colored cells in groups of one to four ; utricles flattened out- 

 wards, closely pressed together, 5-7-gonal in surface view (T), fairly 

 uniform in size, square or slightly flattened (in sections), 21-25/x (T) 

 and 20-21/A (R), thin walled; colored cells of epidermis scanty, 

 scattered, 1— i together ; hypodermal cells in a single layer, scattered, 

 orbicular, 16-28/i, in diameter; corticating layer thin, loose, of strag- 

 gling slender filaments ; antheridia sparse, 1-4 together or in small 

 clusters ; cvstocarps broadlv pyriform, abruptlv narrowed into a short 

 neck, 180-^265/x (T) and 128-170^ (R) ; gonimoblasts slender, very 

 numerous, radiating from a small stalked, cellular placenta, forming 

 a broadly reniform sporogenous mass, abjointing successively ellip- 

 soidal spores; periderm thin, of about 4 layers of pseudoparenchy- 

 matous cells. 



The type specimen of Scinaia Johnstoniae is a specimen collected 

 at San Pedro, California, by Mrs. H. D. Johnston (Herb. Univ. Calif., 

 No. 96356) and the species is, therefore, gratefully dedicated to ^Irs. 

 H. D. Johnston, not only in acknowledgment of her discovery of tliis 

 specimen, but also in recognition of hei- valuable services in collecting 

 and donating interesting algae from Southern California. Mrs. ]\I. 

 S. Snyder has also collected this species at La Jolla, California, for 

 the use of the writer. The writer also feels safe in referring here the 

 Scinaia furcellata var. undulata of ^l. A. Howe (1911, p. 502) from 

 La Paz, California Baja, ^Mexico, after examining a fragment (Vives 

 lid) kindly communicated liy Dr. Howe. The type of Ginnania 

 undulata Mont., as has boon stated above, has been found to be a 

 GloiopJdoca rather than a Scinaia. Scinaia Jolinstoniae, therefore, 



