. The biology of flowering plants. Phanerogams; Plant physiology; Plant ecology; Plant Physiology. PHYLLODES AND CLADODES 195 recently proposed by Arber (1918) and supported by a mass of anatomical evidence, that the leaf of the monocotyledons is in all cases a phyllode, corresponding not to the leaf blade but to the petiole of the dicotyledon leaf. This view is adversely criticised by Fig. 21.—Cladodes of butcher's Fig. 22.—Acacia nereifolia with com- broom {Ruscus aculeatus). pound leaf, phyllode, and transition Nat. size. form. 3 nat, size. What advantage the plant secures by repla
. The biology of flowering plants. Phanerogams; Plant physiology; Plant ecology; Plant Physiology. PHYLLODES AND CLADODES 195 recently proposed by Arber (1918) and supported by a mass of anatomical evidence, that the leaf of the monocotyledons is in all cases a phyllode, corresponding not to the leaf blade but to the petiole of the dicotyledon leaf. This view is adversely criticised by Fig. 21.—Cladodes of butcher's Fig. 22.—Acacia nereifolia with com- broom {Ruscus aculeatus). pound leaf, phyllode, and transition Nat. size. form. 3 nat, size. What advantage the plant secures by replacing a leaf by a leaf-like stem or petiole it is difficult to see ; unless we assume that the leaf, presumably present in some distant ancestor, was of mesophytic type, and that its disappearance,. 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 Skene, Macgregor. New York, The Macmillan Company
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