Thelypteris subg. Lastrea

(Hooker) Alston

J. Wash. Acad. Sci. 48: 232. 1958.

Basionym: Nephrodium subg. Lastrea Hooker Sp. Fil. 4: 5, 84. 1862
Treatment appears in FNA Volume 2.

Distinguished from other subgenera by the combination of seasonal leaves, short-creeping to suberect stems hidden by old petiole bases, persistently scaly petioles, pinnate-pinnatifid blades with greatly reduced proximal pinnae, and veins meeting margin above the sinuses. x = 34.

Discussion

Thelypteris quelpaertensis, T. limbosperma (Allioni) H. P. Fuchs from Europe, and T. elwesii (Baker) Ching from Asia constitute the genus Oreopteris Holub (R. E. Holttum 1981).

Selected References

None.