Regeneration . same of Hypnum serpens with protonema and moss-plant arisingfrom it. Pringsheim has shown that if a piece of the stalk of the sporan-gium of certain mosses is cut off, it produces at its ends thread-likeoutgrowths which are like the protonema-stage of the moss, and fromthis protonema new moss-plants may arise (Fig. 10, A, B, C, D). Braefeld has obtained a somewhat similar result in one of themoulds, in which a piece of the sporangium stalk gives rise to amycelium from which new sporangia may be produced. i8 RE GENERA TION REGENERATION IN EMBRYOS AND EGGS Regeneration takes place
Regeneration . same of Hypnum serpens with protonema and moss-plant arisingfrom it. Pringsheim has shown that if a piece of the stalk of the sporan-gium of certain mosses is cut off, it produces at its ends thread-likeoutgrowths which are like the protonema-stage of the moss, and fromthis protonema new moss-plants may arise (Fig. 10, A, B, C, D). Braefeld has obtained a somewhat similar result in one of themoulds, in which a piece of the sporangium stalk gives rise to amycelium from which new sporangia may be produced. i8 RE GENERA TION REGENERATION IN EMBRYOS AND EGGS Regeneration takes place not only in adult organisms, but also inembryos, and larvae of many animals. It is often stated that thepower of regeneration is more highly developed in embryos than inadults, but the facts that can be advanced in support of this view-are not numerous. One of the few cases of this sort known to usis that of the leg of the frog, that does not regenerate, while the legof the tadpole is capable of
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