Eacute;tude au microscope eacute;lectronique agrave; balayage de la bulbille deHuperzia selago(L.) Bernh. (Lycopodium) : meacute;ristegrave;me apical, initiation foliaire et phyllotaxie

摘要

The shoot apex of the bulbil ofHuperzia selago(L.) Bernh. (Lycopodium) has been examined by scanning electron microscope. From an ontogenic point of view, changes in shape and size have been observed in the apical meristem. Successive minimal and maximal areas of this meristem are described during a plastochron. Area and cell number are also quantified with the scanning electron microscope. Only one leaf is initiated at the beginning of each plastochron, and the two contact parastichies observed in the shoot apex of the mature bulbil are two foliar helices.