Now, it is these sporangia of the Lepidodendroid plant Flemingites which were identified by Mr. Carruthers with the free sporangia described by Professor Morris, which are the same as the large sacs of which I have spoken.

[Illustration] (2) Sporangia in oblong sori under a reflexed tooth of a pinnule; indusium broad; rachis dark and shining.

It may be said that the Carboniferous formations demonstrate the existence of a vast extent of dry land in the present dry-land area, and that the supposed terrestrial Palaeozoic Vertebrate Fauna ought to have left its remains in the Coal-measures, especially as there is now reason to believe that much of the coal was formed by the accumulation of spores and sporangia on dry land.

Sori on the edge of a pinnule terminating a vein; sporangia at the base of a long, bristle-like receptacle surrounded by a cup-shaped indusium.

THE BRACKEN GROUP Sporangia near or on the margin of the segments, the reflexed portions of which serve as indusia.

A loose compound cluster of flowers or sporangia with irregular stems.