. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. /C^^v,/^ 'V Fig. 64 (left). — Chondriome in (1-4) diflferentiated colorless root par- enchyma of Athyrium Filix-femina and in (5, 6) frog's liver. Regaud's method. (After Mangenot and Emberger). Fig. 65 (right). — Detail of chondriome in (A) Saprolegnia and in (B) epidermis of tulip perianth. X 3000. Regaud's method. These two categories have the same shape in the phanerogams and it is almost always impossible to tell them apart in the meri- stems and usually, also, even in mature cells which do not have chlorophyll. They
. The cytoplasm of the plant cell. Plant cells and tissues; Protoplasm. /C^^v,/^ 'V Fig. 64 (left). — Chondriome in (1-4) diflferentiated colorless root par- enchyma of Athyrium Filix-femina and in (5, 6) frog's liver. Regaud's method. (After Mangenot and Emberger). Fig. 65 (right). — Detail of chondriome in (A) Saprolegnia and in (B) epidermis of tulip perianth. X 3000. Regaud's method. These two categories have the same shape in the phanerogams and it is almost always impossible to tell them apart in the meri- stems and usually, also, even in mature cells which do not have chlorophyll. They are, however, always perfectly distinct in some lower plants (bryophytes, algae) in which chlorophyll is present in all stages of development. Thus considered, the plastids are not differentiated chondrio- somes; they are a special type of chondriosomes. In fact, when the life history of the chondriosomes is followed in the phanero- gams, one is struck by the chondriosomal characteristics which the plastids always maintain. The amyloplasts are usually typical chondriosomes and are only occasionally a little thicker than the other elements of the chondriome. They are not actually distin- guishable from the inactive chondriosomes coexistent with them, until they become chloroplasts. In this case they appear as thick- ened bodies which, in the last analysis, are only hypertrophied chon- driosomes containing chlorophyll. As for the variations in plas- tidial shape, we do not yet know whether they are caused by a growth of these elements or merely by Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Guilliermond, Alexandre, 1876-; Atkinson, Lenette May Rogers, 1899-. Waltham, Mass. , Chronica Botanica Company
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