I. Studies in the morphology of spore-producing members. Part. II. Ophioglossaceæ

Abstract

In a paper published in the ‘Philosophical Transactions’ (Series B, 1894), the comparative study of the spore-bearing members of the Lycopodineæ, including the Psilotaceæ, has led to the conclusion that there is reasonable probability that septation of sporangia originally simple, to form synangia, has taken place; that a septate body (synangium) may be homologous with a non-septate body (simple sporangium); and that there is no essential difference between tissue which will form septa or trabeculæ, and that which will form spores, since the tissues can mutually undergo conversion one into the other. But the considerations there brought forward do not amount to an actual demonstration that septation has occurred.