Osmunda is a genus of primarily temperate-zone ferns of family Osmundaceae. Five to ten species have been listed for this genus. The species have completely dimorphic fronds or pinnae (hemidimorphic), green photosynthetic sterile fronds, and non-photosynthetic spore-bearing fertile pinnae, with large, naked sporangia. Because of the large mass of ...
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fern genus of the family Osmundaceae, with divided fronds and often growing to a height of 1.5 metres (5 feet). The matted fibrous roots of these ... [2 related articles]
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http://www.britannica.com/eb/a-z/o/36
These are evergreen or deciduous (leaf-losing) Ferns native to North America, the West Indies, Japan, northern Asia and Europe. Those grown in North America are hardy. The most popular kind is O. regalis, the Royal Fern. It can reach a height of 6 feet with a 3-foot spread. This deciduous Fern has broadly oval to oblong, bright green fronds. At the...
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Osmunda is a genus of ferns with sori distinct from the leafy part of the fronds, being borne in panicles of thyrsoid clusters. From this habit they are commonly known as flowering ferns. The genus includes the native British Royal Fern (Osmunda regalis) which grows to one metre in height.
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http://www.probertencyclopaedia.com/browse/BO.HTM
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