The leaf-bundles are always collateral (the phloem being turned downwards and the xylem upwards), even in Ferns, where the petiolar strands are concentric, and they have the ordinary mesodesm and peridesm of the collateral bundle. [Please select]
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): of meta-thorax of Hymenoptera, is the middle of the dorsum, divided into three spaces or cells; 1st or basal area, 2d or Lipper median or areola; 3d or apical or petiolar area. [Please select]
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Petiolar area or Petiolarea: on the metanotum of some Hymenoptera, the apical or hindmost of the three median cells 3d median area; apical area. [Please select]
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