Summary. -A qualitative comparison is realized in 1\losses between the primary protonema formed from the spore and the four filamentous systems obtained from the seconclary initiais of the leafy gametophyte. These systems are : the facultative gemmiferons chloronema of Bryum capillare var. {laccidum, the adventitious buds and the caulonema rhizoids of Aulacomnium palustre, and the filamentous leaves of Dicranum scoparium.
L'observation des bourgeons garnétangiaux mfdes (andrécit•s 1 ct femelles (gynécies) de la Fontinalis développée dans diverses conditions de milieu, suggère un double caractère du ramuscule sexualisé des plcurocarpes : bourgeon à croissance d'abord anticipée, puis fortt•ment inhiht"·c corrélativement par l'apex végétatif. Cette dualité de la dominam·c clans l'apex des Bryales pourrait être mise en relation a\·ec la capacité de photo· synthèse des feuilles.Summar11. -The formation of sexual lateral short shoots, with apical antheridia or archegonia, is bound, in Fontinalis, to the growth •·ate of the
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