100 University of California Puhlications in Botany [Vol. 6 



below the apices of the branches but which soon broadens and becomes 

 diffuse below. 



It is to be noted that one of the species included in this group is 

 found in Florida, one in the corresponding latitudes of the Pacific 

 Coast, in Southern and Lower (Baja) California, and the third on 

 the coast of Japan. 



Scinaia complanata (F. S. Collins) Cotton 



Plate 11, figs. 19-22. 



'-1 



Cotton, in Kew Bulletin, No. 7, p. 260, 1907 (excl. Japanese plant). 

 Scinaia furcellata var. complanata F. S. Collins, in Phyc. Bor. Am., Fasc. 17, No. 



836, 1901, Ehodora, vol. 8, p. 110, 1906. 

 Scinaia furcellata Harvey, Nereis Boreali-Americana, part 2, p. 136, 1853 (in part, 



incl. Key West plant only). 



Plant pale rose red ; 5-8 cm. high, 8-9 times dichotomous, axils rather 

 broad, flattened, not constricted, 1.5-6(?)mm. in diameter (dried); 

 axis obscure ; cystocarps scattered, visible ; — axial strand of 6-8 broad 

 filaments, plain above, soon diffuse and disappearing below ; epidermis 

 of large colorless cells, or utricles, uniform and closely packed together 

 with very scanty colored cells, except near the apices of the branches ; 

 utricles flattened at outer end, uniform and closely placed, 5-6-gonal 

 in surface view (T), in section flattened rectangular, 34-35/a (T) by 

 22 fx (R) ; colored cells of epidermis slender, very few except at tips 

 of branches ; hypodermis of a single layer, of loosely placed round or 

 pyrif orm cells 8-9/^ in diameter ; corticating layer narrow, loose ; 

 antheridia scattered, single or two together; cystocarps broad pyri- 

 form, globular below abruptly narrowed outwards into a short neck, 

 about 200/x (T) by 165/a (R) ; gonimoblasts slender, very numerous, 

 forming a reniform mass, radiating from a few celled placenta, and 

 abjointing successively elliptical oblong spores; periderm thin, of 2-3 

 layers of pseudoparenchyma, loosely placed ; punctum vegetationis 

 convex projecting (at least in young tips). 



Scinaia complanata is based on specimens from Indian River 

 Inlet, Florida, collected by Mrs. G. A. Hall. The description, as given 

 here, has been drawn chiefly from No. 836 of the writer's copy of the 

 Phycotheca Boreali-Americana (a co-type).). This is a specimen about 

 3 mm. in diameter (dried). Other specimens which seem to belong 

 here are narrower and have modified some details of the description. 

 These specimens are: (1) a specimen collected at Key West, Florida, 

 by W. H. Harvey in February, 1850 (Herb. Univ. Calif., No. 68340) 



