The Stomata of Gnetum

In both Gnetum gnemon and G. ula the atomatal development inthe collars and axes of the male and female cones and the outertwo envelopes of the ovule is of the haplocheilic type. In theleaf some stomata do show parallel subsidiary cells, but theyarise from the surrounding epidermal cells and do not seem tohave a common origin with the guard cells. This conflicts withearlier accounts and is of interest in relation to the typesof stomata met with in other gymnosperms, living and fossil.