d, white, yellow, etc., make up the genus _Trifolium_.

Thus individuals are grouped into species and species are associated into
genera, and the two groups are united to give each fern or plant its true
name, the generic name being qualified by that of the species; as in the
cinnamon fern _Osmunda_ (genus), _cinnamomea_ (species).

CHECK LIST OF THE FERNS OF NORTHEASTERN AMERICA

In the following list the first name is usually the one adopted in the
text, and those that follow are synonyms.

Names printed in small capitals are those of the newer nomenclature, now
adopted at the Gray Herbarium but not in the Manual.

ADIANTUM L.
1. Adiantum Capillus-Veneris L.
2. Adiantum pedatum L.
Var. ALEUTICUM RUPR.

ASPIDIUM SW.
3. Aspidium Boottii. Tuckerm.
Dryopteris Boottii. (Tuckerm.) Underw.
THELYPTERIS BOOTTII. (Tuckerm.) Nieuwl.
4. Aspidium cristatum. (L.) Sw.
Dryopteris cristata. (L.) A. Gray.
THELYPTERIS CRISTATA. (L.) Nieuwl.
5. Aspidium cristatum var. Clintonianum. D.C. Eaton.
Dryopteris cristata var. Clintoniana. (D.C. Eaton.) Underw.
THELYPTERIS CRISTATA var. CLINTONIANA. (D.C. Eaton.) Weatherby.
6. Aspidium cristatum x marginale. Davenp.
7. Aspidium Filix-mas. (L.) Sw.
Dryopteris Filix-mas. (L.) Sw.
THELYPTERIS FILIX-MAS. (L.) Nieuwl.
8. Aspidium fragrans. (L.) Sw.
Dryopteris fragrans. (L.) Schott.
THELYPTERIS FRAGRANS. (L.) Nieuwl.
9. Aspidium Goldianum. Hook.
Dryopteris Goldiana. (Hook.) A. Gray.
THELYPTERIS GOLDIANA. (Hook.) Nieuwl.
10. Aspidium marginale. (L.) Sw.
Dryopteris marginalis. (L.) A. Gray.
THELYPTERIS MARGINALIS. (L.) Nieuwl.
11. Aspidium noveboracense. (L.) Sw.
Dryopteris noveboracensis. (L.) A. Gray.
THELYPTERIS NOVEBORACENSIS. (L.) Nieuwl.
12. Aspidium simulatum. Davenp.
Dryopteris simulata. Davenp.
THELYPTERIS SIMULATA. (Davenp.) Nieuwl.
13. Aspidium spinulosum. (O.F. Muell.) Sw.
Dryopteris spinulosa. (O.F. Muell.) Kuntze.
THELYPTERIS SPINULOSA. (O.F. Muell.) Nieuwl.
14. Aspidium spinulosum var. intermedium. (Muhl.) D.C. Eaton.
Dryopteris spinulosa var. intermedia. (Muhl.) Underw.
THELYPTERIS SPINULOSA var. INTERMEDIA. (Muhl.) Nieuwl.
15. Aspidium spinulosum var. concordianum. (Davenp.) Eastman.
THELYPTERIS SPINULOSA var. CONCORDIANA. (Davenp.) Weatherby.
16. Aspidium spinulosum var. dilatatum. (Hoff.) Gray.
Dryopteris spinulosa var. dilatata. (Hoff.) Underw.
T