Organography of plants, especially of the archegoniatae and spermaphyta . afon the right, and it forms a transition from thefoliage-leaf to the envelope-leaf. Magnified 20. Wichura, Beitrage zur Physiologic der Laubmoose, in Pringsheims Jahrbiicher, ii (1S60), p. 194. ? \\ e may say the same of the analogous cases, for instance that of Mastigobryum, amongst theHepaticae. Why should the leaves by their curvature (which in Mastigobryum is always towardsthe under side of the shoot; assume a kmd of profile-position ? ^ See p. 3S9. 130 CONFIGURATION OF THE MOSS-PLANT many Spermophyta. The sheath of
Organography of plants, especially of the archegoniatae and spermaphyta . afon the right, and it forms a transition from thefoliage-leaf to the envelope-leaf. Magnified 20. Wichura, Beitrage zur Physiologic der Laubmoose, in Pringsheims Jahrbiicher, ii (1S60), p. 194. ? \\ e may say the same of the analogous cases, for instance that of Mastigobryum, amongst theHepaticae. Why should the leaves by their curvature (which in Mastigobryum is always towardsthe under side of the shoot; assume a kmd of profile-position ? ^ See p. 3S9. 130 CONFIGURATION OF THE MOSS-PLANT many Spermophyta. The sheath of the leaf enlarges, whilst the lamina isonly slightly developed, and thus it forms a large membranous perichaetial leaves of Diphyscium are also markedly different from thevegetative ones. The vegetative ones (Fig. 113 to the left) are simpletongue-like: the leaves of the envelope around the archegonia are muchlarger and broader, and they end in a long bristle, such as we find in thevegetative leaves of many xerophilous Musci, and they have cilia on the. ^^:o Fig. 114. I-V, Eriopus remotifolius. /, plant with fructification, showing habit. 77and///, gemmae; A, out-growth of the gemma ; 7\ separation-cell. IV, hair from the calyptra. V^ hair from the seta. VI, Drepa-nophyllum fulvum. Portion of shoot to show habit, /magnified about 4. // and /// highlji^ magnified 12. margin in the upper part (Fig. 113 to the right). These cilia are arrange-ments for the retention of water, which has the same function in fertilizationhere as in the Hepaticae. The bristles, as we shall see, are essentially pro-tections against drought. Musci possess also bilateral and dorsiventral shoots besides radialones, and, as I have already shown ^ :— ^ See Part I, pp. 66 and loo. BILATERAL SHOOTS 137 1. The bilateral or dorsiventral shoots proceed from radial ones. 2. The bilateral or dorsiventral shoots are an adaptation, in varyingdegree, to external relationships, especially
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