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Osmundaceae

Osmundaceae
Osmundaceae image
Morton Arboretum
  • FNA
  • Resources
R. David Whetstone
T. A. Atkinson in Flora of North America (vol. 2)
Plants terrestrial, herbaceous, frequently in clumps. Stems creeping, beset with old petiole bases and black fibrous roots; scales absent; older stems seldom persisting. Leaves monomorphic or dimorphic. Blades 1--2-pinnate (2-pinnatifid); rachises grooved. Pinnae monomorphic or dimorphic. Indument of reddish to light brown hairs. Veins dichotomous, running to margins. Sori absent; sporangia born on slightly modified fertile segments of blades also possessing fully expanded pinnae, or sporangia covering blades lacking green expanded pinnae, clustered in marginal zones, indusia lacking. Spores green, all alike. Gametophytes green, aboveground, obcordate to elongate.

Osmundaceae are considered intermediate in several respects between eusporangiate and leptosporangiate ferns. In the absence of sori, simultaneous maturation of spores, and development of sporangia from several initial cells, they are much like eusporangiate ferns. Their large prothalli with projecting antheridia are similar to those of leptosporangiate ferns.

Species within inventory project: Arizona Flora
Claytosmunda claytoniana
Media resource of Claytosmunda claytoniana
Leptopteris alpina
Media resource of Leptopteris alpina
Leptopteris fraseri
Media resource of Leptopteris fraseri
Leptopteris hymenophylloides
Media resource of Leptopteris hymenophylloides
Leptopteris superba
Media resource of Leptopteris superba
Leptopteris wilkesiana
Media resource of Leptopteris wilkesiana
Osmunda acuta
Media resource of Osmunda acuta
Osmunda herbacea
Media resource of Osmunda herbacea
Osmunda japonica
Media resource of Osmunda japonica
Osmunda lancea
Media resource of Osmunda lancea
Osmunda regalis
Media resource of Osmunda regalis
Osmunda ruggii
Media resource of Osmunda ruggii
Osmunda spectabilis
Media resource of Osmunda spectabilis
Osmunda spicant
Media
not available
Osmunda vachellii
Media resource of Osmunda vachellii
Osmunda x ruggii
Media resource of Osmunda x ruggii
Osmundastrum cinnamomea
Media resource of Osmundastrum cinnamomea
Osmundastrum cinnamomeum
Media resource of Osmundastrum cinnamomeum
Plenasium angustifolium
Media resource of Plenasium angustifolium
Plenasium banksiifolium
Media resource of Plenasium banksiifolium
Plenasium javanicum
Media resource of Plenasium javanicum
Plenasium vachellii
Media resource of Plenasium vachellii
Todea barbara
Media resource of Todea barbara
Todea hymenophylloides
Media resource of Todea hymenophylloides
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This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

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