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For a number <»t sttidies of induction phenomena in photosynlhesis the moss species Polytrichum attenuatum was used as experimetital plant (Vcjlhy 1958(Vcjlhy a. b, 1959. Tbe pbotosyiitbesis time curve was bere sbown to form an induction peak ^iO to (10 .secund.s alter tbe on.sel of iUinnination. Previously, van der Veen (1949a, b), in experiment.s wilb leaves of Ibe f;;rass species Holcus lanattis and of tobacco plants stiowed Ibat, in addition, at bif,'b li^jbl intensities in particular, one or more secondary peaks occur in tbe titne curves. In order to cbeck tbe possibility of similar pbenomena occurring in messes, experiments were made wilb six pleurocarpous and six acroearpons mosses (iiryales), and witb tbree species of bog moss (Spbagtiales) and tbree liverworts (Hepaticae).The results of tbese experiment.s demonstrated tbe existence of a sinfjie, secondary peak in the tinte curves of four mo.ssos, Lf., in tho.se of Ibree pleurocarpous species (of f.;euus Tbuidimn) and in tbat of Tortula muralis from tbe acrocarpous group of Bryales. In tbe rest of tbe plants eitber no secondary peak could be observed, or only a sligbt shoulder appeared in tbe curve at the time wben otu* might be expected. In one sitigle case, tbat of Heludium blaudowii, no inductioti peak wbatsoever could be found to occur under tbe given conditions of the experiment. Material and MethodsThe foJtowing species were ctiosen for the main ex[)tTinienls: PUujioUtetinm limliilatiiin |I..i tirufti and Sell., Pseinlosclrropodiiini pnrnni (Hodw.) t'ti-iscli., Ilelodium blaiulondi (Wet), iind Molir) W'arn.st., Thnidiitm iamnrlscimim (Hedw.) Br. cur., PHualol. Plant.. 12.1059 [559] KNUD VKJLBY 2L/hr/ 4L./hr. 5L/hr 7L/hr.

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