This document contains diagrams and electron micrographs of various algal cells and their organelles. It describes features of cryptophyte ejectosomes, dinoflagellate nuclei, euglenophyte eyespots, and chloroplast structures across different algal groups. Specifically, it notes that cryptophyte ejectosomes line cell walls and parts can be seen beneath the cell membrane. Dinoflagellate nuclei contain large nucleoli and permanently condensed chromosomes. Euglenophyte eyespots are composed of globules outside the chloroplast near the flagellar swelling. Chloroplasts are described across haptophytes, chrysophytes, and euglenophytes showing similarities in thylakoid stacking and membrane structures.

1. Diagram of a longitudinal section of a cryptophyte

2. Sieve elements of Nereocystis

3. Diagram of a brown algal cell

4. Pyrenoids of a brown algal cell

5. Chloroplast of Fucus

6. Electron micrograph of a cryptophyteThe large ejectosomes seen here line the wall of the gullet

7. Part of a smaller ejectosome is visible just beneath the plasmalemma on the lower left side of the cellA Cryptophyte eyespotThese eyespots may be one or several layers thick

8. they are located with in the chloroplast but not close to the flagella

9. the eyespot operates by either intercepting light (shading) or reflecting light (increasing the illumination) onto the photoreceptor pigment

10. which is probably localized in either the plasma membrane or chloroplast membranes over the eyespotInterphase nucleus and chromosomes of a dinoflagellateThe chromosomes lack histones, are permanently condensed and have a characteristic banded appearance

11. There is a large nucleolus within the nucleusInterphase nuclei of a green alga and a euglenophyteNote the condense chromosomes of the euglenophyteEyespot of a euglenophyteThe eyespot is composed of loosely packed globules lying outside the chloroplast, next to the reservoir, opposite of the flagellar swelling

12. the swelling is usually on the longer, emergent flagellum and is thought to be the site of the photoreceptor pigmentEuglena- Diagrammatic longitudinal section

13. Euglena longitudinal section- Note the distinctive outer covering, the pellicle

14. Outer view of a haptophyte- The cell surface is completely encased in coccoliths , special organic scales encrusted with calcium carbonate

15. Electron micrograph of Chrysochromulina- This photograph shows the two flagella and a haptonema, the latter lightly coiled at the tip

16. Several cross-sections through a haptonema- Note the outer sheath of three concentric membranes and the inner circle of 6 or 7 microtubules

17. Sections through parts of chloroplasts from 3 algal groups-upper photo: chrysochromulina (haptophyte)PER surrounds chloroplast

18. chloroplast envelope has 2 membranes

19. Middle photo: dinobryon (chrysophyte)

20. has a girdle lamella

21. PER surrounds chloroplast

22. chrloroplast envelope has 2 membranes