176 University of California l^iihlications in Botanjj [Vol.8 



and up to 5 cm. or more wide; utricles 500-60(V long, 50-110/x, up 

 to 160/1, diam., nearly cylindrical when young, with a constriction just 

 below the rounded apex, at maturity, with a decided shoulder below 

 the constriction bearing a whorl of 4-6 hairs, membrane usually thick- 

 ened at the apices, up to 25/1 tliick; gametangia (?) borne below the 

 middle of the utricles, fusiform, 220/^ long, 60-75/x diam., membrane 

 thin. 



Guadalupe Island, Mexico. 



Suringar, Algae Japonicae, 1870, p. 22, pi. 7 ; Okamura, Icon, 

 Japan. Algae, 1915, vol. 3, no. 9, p. 158, pi. 142. 



The inclusion of Codium latum Sur., a Japanese species, in our 

 account is based u])on several specimens in the Daniel Cady Eaton 

 Herbarium of Yale University. These specimens were collected on 

 the shores of Guadalupe Island by E. Palmer in 1875. The specimens 

 are nearh' cylindrical and dichotomous or dichotomo-fastigiate below, 

 but soon expand into long, broad, flattened lobes or branches. The 

 particular character which makes the reference of these specimens to 

 C. latum seem plausible, is the existence of a distinct whorl or verticil 

 of hairs (shown in older specimens hy projecting scars) a little below 

 the broad apex of each utricle. These are distinctly represented in the 

 illustrations of the species by Okamura (1915, pi. 142, f. 4, 6). The 

 specimens resemble those of the C. Lvndenhergii complex, but differ 

 decidedly in the shape and size of the utricles as well as the arrange- 

 ment of hairs upon them. The Guadalupe plants do not approximate 

 the extremes of either length or breadth given by Okamura {loc. cit.) 

 for his Japanese specimens but are very similar to the dimensions 

 given by Suringar {loc. cit.). 



8. Halimeda Lamour. 



Fronds jointed, freely branching from near the base, attached by. 

 a dense mass of rhizoidal filaments usually strongly calcified except 

 at the nodes; segments from slightly to very much flattened and 

 expanded, flattened cylindrical, cuneate, orbicular or reniform, entire 

 or variously lobed; medullary tissue a strand of longitudinal, slender, 

 branched, unseptate filaments, expanding in the segments by lateral 

 branchlets whose terminal cells (utricles) cohere more or less tightly 

 to form a continuous layer, but unchanged, although often anastomos- 

 ing, at the nodes and at the apex; reproduction b}^ globose or ovoid 

 sporangia (?) borne on slender filaments projecting beyond the sur 



