. On the Development and Morphology of the Leaves of Palms. Fig. 7.—Rhapis hurmiUs^ Blume. Series of transverse sections through young leafof mature plant, passing through junction of petiole and leaf-limb from belowupwards (x9, circa); fig. 7, A, top of petiole; in fig. 7, B, invagination is justbeginning and the slightly developed dorsal scale or dorsal crest {) isdistinguishable ; in fig. 7, C, the ligule or ventral crest {) is just becomingdetached, while in fig. 7, D, it is entirely free. The asymmetry of fig. 7, B and C,is due to a slight obliquity in the series of sections. each

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. On the Development and Morphology of the Leaves of Palms. Fig. 7.—Rhapis hurmiUs^ Blume. Series of transverse sections through young leafof mature plant, passing through junction of petiole and leaf-limb from belowupwards (x9, circa); fig. 7, A, top of petiole; in fig. 7, B, invagination is justbeginning and the slightly developed dorsal scale or dorsal crest {) isdistinguishable ; in fig. 7, C, the ligule or ventral crest {) is just becomingdetached, while in fig. 7, D, it is entirely free. The asymmetry of fig. 7, B and C,is due to a slight obliquity in the series of sections. each case, left overarching the base of the limb. This produces the dorsalscale at the back (, B, clc), and the more prominent *ligule on theventral side (fig. 7, 0, D, ). The hooded tip of the plumular leaf ofPritchardia filifera (fig. 5, E) is a comparable case on a smaller scale, thoughhere it is the distal end of the median invagination which is overarched bythe ventral surface of the limb. I think it will be agreed that the almostcup-like form

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Keywords: ., bookcentury1900, bookdecade1920, bookidphiltrans081, bookyear1922