In the more highly developed series, the mosses, this last division of labor takes the form of the differentiation of special assimilative organs, the leaves, commonly with a midrib containing elongated cells for the ready removal of the products of assimilation; and in the typical forms with a localized absorptive region, a well-developed hydrom in the axis of the plant, as well as similar hydrom strands in the leaf-midribs, are constantly met with. [Please select]
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From time to time these chips are loaded into one of the sheaths of the midribs, and carried away to be cleaned. [Please select]
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The bases of the midribs widen out and wrap round the stem like a kind of sheath, as almost all leaf-stalks do to some extent. [Please select]
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Just as the buds unfold, the young caterpillars make little holes through the tender leaves, eating the pulpy portions, not touching the veins and midribs. [Please select]
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