Wednesday, January 16, 2013
Botany picture #22: Osmunda regalis
Many species are very large and robust compared to other ferns, and their large fronds often have specialized pinnae carrying the sporangia; in most other leptosporangiate ferns, the sporangia are found either on otherwise normal pinnae or an entire frond is turned into a specialized sporophyll. In the case of this European species, the apex of the frond carries the sporangia and is visibly different from the lower pinnae. The next botany picture will show a species with a different arrangement.