Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A sporangium or conceptacle containing only large spores; --opposed to microsporangium. Both are found in the genera Selaginella,Isoctes, and Marsilia, plants remotely allied to ferns.
