Structure of Plant Cells with Special Reference to Lower Plants

Publisher Website
Google Scholar
Abstract
Making use of the electron microscope the author has attempted to determine whether the structure of the chloroplasts in algae has taxonomic significance. Chloroplasts were studied in a total of 25 spp. and 9 divisions. All divisions except the Cyanophyta and Glaucophyta have chloroplasts. Those with chloroplasts were classified into several groups based upon the lamellae structure of their chloroplasts. The groups are: (1) chloroplasts with 2 lamellate layers-Rhodophyta; (2) chloroplasts with 4 lamellate layers - Phaeophyta, Pyrrophyta, Chrysophyta and Euglenophyta; (3) chloroplasts with grana-like structure - Charophyta and Chlorophyta. These groups can be subdivided on the basis of the presence or absence of pyrenoids. Pyrenoids are classified into 5 types in relation to their lamellae and the assimilation products they contain.