19. Brown, Jr. R. M. and R. J. McLean. 1969.
New taxonomic criteria in classification of Chlorococcum
species. II. Pyrenoid structure. J. Phycol. 5:114-118.
19. Summary
The pyrenoids of 18 Chlorococcum
species including 3 now transferred to Tetracystis) have
been investigated at the ultrastructural level. Three categories
of pyrenoids were observed, including pyrenoids with unfragmented
perforate starch plates in 11 species; those with many separate
fragmented starch plates 217 6 species; and those with hemispherical
starch plates in 1 species. Pyrenoids were further distinguishable
on the basis of the number of thylakoid disks or tubules which
penetrate the ground substance. Stability and diversity of pyrenoid
fine structure as a taxonomic criterion at the specific level
have been demonstrated.