360 Pub. Puget Sound Biol. Sta. Vol. 2, No. 53 



PLATE 60 



Figs. 1— I. Desmarestia herbacea (Turner) Lamouroux. 



Fig. 1. Longitudinal section of j^oung tissue, sieve tubes of central axis 

 with beginning of inner assimilating tissue^, and branch veins without 

 assimilating tissue; callose at sieve plates. X 88. 



Fig. 2. Cross section of lateral branch, through midrib and through 

 lamina. X 88. 



Fig. 3. Cross section of lamina of lateral branch. Phycocelis sp. epiphytic 

 on surface. X 188. 



Fig. 4. Cross section of thallus, near stipe, with Phycocelis sp. X 188. 



Figs. 5-9. Desmarestia latissima Setchell and Gardner. 



Fig. 5. Cross section of lateral branch, showing sections of small seondarv 

 veins surrounded by assimilating cells, large cells of ground tissue and 

 small cortical cells. X 188. 



Fig. 6. Longitudinal section of lateral branch, through midrib, perpen- 

 dicular to flat surface of frond. X 88. 



Fig. 7. Cross section of lateral branch. X 88. 



Tig. 8. Longitudinal section of midrib, base of main axis. X 188. 



Fig. 9. Longitudinal section of holdfast, showing central axis reaching 

 almost to base. X 50. 



