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The physiology of sexual reproduction in Lunularia cruciata Dum

, : The physiology of sexual reproduction in Lunularia cruciata Dum. Trans Brit Bryol Soc 2(4): 513-522

L. cruciata. though world-wide in distribution, rarely reproduces sexually except in a "Mediterranean type" climate. It is shown experimentally that the conditions for archegoniophore production include: long days; a rise in temperature of about 10[degree] F. (though not the exceeding of any critical minimum temperature); a previous subjection to low temperature, indicated by the success of archegoniophore induction only between November and April; semi-dormant plants with the thalli of the previous season's growth well developed and uninjured by frost or shading. Antheridiophore production begins in Britain in late summer and could not be induced experimentally. These observations are related to the climatic and ecological distribution of fertile plants. Males and females are about equally common. Sexual plants are probably often overlooked, as fertilization is infrequent. In an appendix the young archegoniophore is described and figured.


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