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Published In: Species Plantarum 2: 1063. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 7/9/2009)
Acceptance : Accepted
Project Data     (Last Modified On 8/5/2009)


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1. Osmunda L.

Plants perennial, homosporous. Rhizomes erect to creeping, lacking hairs and scales. Leaves variously compound, the fertile portions or fertile leaf blades lacking vegetative tissue. Petioles with stipular flanges of tissue. Indusia absent, the developing sporangia sometimes covered by dense, matted hairs. Sporangia in dense clusters along the pinnule axes, splitting open vertically, the annulus a patch of thick-walled cells on the side of the sporangium. Spores trilete, 40–70 mm in diameter, green, 256–512 per sporangium. Gametophytes green, flat, oval to nearly circular.

About 10 species, nearly worldwide.


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1 Leaf blades 2 times pinnately compound, the leaf blades ovate to oblong in outline, the pinnules mostly unlobed, the margins minutely toothed 3 Osmunda regalis var. spectabilis
+ Leaf blades 1 time pinnately compound, lanceolate to oblanceolate in outline, the pinnae deeply lobed, the margins entire (2)
2 (1) Leaf blade undersurfaces with a tuft of hairs at the base of each pinna; vegetative and fertile leaves wholly dimorphic 1 Osmunda cinnamomea
+ Leaf blade undersurfaces without a tuft of hairs at the base of each pinna; fertile pinnae produced near the middle of otherwise vegetative leaves 2 Osmunda claytoniana
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