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Osmundaceae
See list of 2 genera in this familyThe report of Osmunda claytoniana ×Osmundastrum cinnamomeum by Sorrie and Somers (1999) was based on a collection of Osmunda claytoniana— Ahles 83707 ( MASS!). Reference: Whetstone and Atkinson (1993).
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1a. Fertile leaves with monomorphic leaflets, borne on a blade separate from the vegetative leaves; axil of leaflets on vegetative leaves bearing a tuft of white hairs (these turning light brown with age) on the abaxial side
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1b. Fertile leaves with dimorphic leaflets—some leaflets bearing sporangia and some not; axil of vegetative leaflets without a tuft of hairs
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Each photo represents one genus in this family.