and mitochondria also occur, as do many lipid vacuoles and some calcium oxalate crystals.
(19) F Mehlis' gland (20) F vitellaria in adults lateral and follicular (21) F no dictyosomes
or endoplasmic reticulum in larval epidermis
Ultrastructural aspects and reserve accumulation: The cytoplasm of the apical cells of the GTs is rich in organelles; mitochondria, dictyosomes
, plastids, and ribosomes are prevalent; the ribosomes are either free or associated with segments of the endoplasmic reticulum (Fig.
The models involved the autogenous emergence of the endoplasmic reticulum, nuclei, and dictyosomes
and the autogenous or xenogenous evolution of flagella and microtubular and non-microtubular cytoskeletal structures, before the symbiotic acquisition of mitochondria and plastids.
The Eustigmatophyceae have been considered to be outside the Chromophyta by some authors because of the possession of a distinctive eyespot, the lack of a girdle lamella in chloroplasts and the absence of dictyosomes
from zoospores (Hoek, 1978; Hibberd, 1979).
Colleter cells have thin walls, dense cytoplasm, large nuclei, many mitochondria, rough endoplasmic reticulum, and abundant dictyosomes
. Histochemical tests with Ruthenium red showed pectic compounds in the cytosol.