J64 Pub. Pucjet Sound Biol. Sta. Vol. 2, No. 53 



PLATE 62 



Figs. 1-7. Desmarestia ligulata (Lightfoot) Lamouroux. 



Tig. 1. Original row of cells of thallus : a, intercalary growing region; 

 b, terminal hair bearing lateral branches irregularly arranged; e, 

 permanent axis with opposite lateral branches. X 275. 



Fig. 2. Longitudinal section of young lateral branch: aa', central axis; 

 bb', edge of thallus ; c, intercalary growing region of lateral branches ; 

 d, point of abscission. X 170. 



Fig. 3. Longitudinal section of young lateral branch: a, central axis; 

 b, lateral branch ; c, cortical layer ; d, ground tissue ; e, beginning of 

 development of inner assimilation tissue. X 170. 



Fig. 4. Cross section of young lateral branch, such as in Fig. 3. X 170. 



Fig. 5. Longitudinal section of young branch perpendicular to flat surface 

 of frond. X 170. 



Fig. 6. Cross section of young branch, showing inner assimilation tissue 

 surrounding central axis, and distribution of chromatophores. X 165. 



Fig. 7. Branching sieve tube from secondary outgrowth from lateral 

 branch of central axis. X 170. 



Figs. 8-10. Desmarestia latissima Setchell and Gardner. 



Figs. 8-9. Method of branching of conducting hyphae. X 275. 



Fig. 10. Network of conducting hyphae with chromatophores, between 

 two regions of large ground tissue cells. X 170. 



