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.

... more about "Thelypteris subg. Lastrea"
reduced +
Alan R. Smith +
(Hooker) Alston +
Nephrodium subg. Lastrea +
pinnate-pinnatifid +
Nearly worldwide +
glandular +  and hairy +
not continuous +
branched +  and simple +
transparent +
ephemeral +  and persistent +
round-reniform +
small +  and large +
monomorphic +
reticulate +  and echinate +
short-stalked +  and sessile +
J. Wash. Acad. Sci. +
elongate +, oblong +  and round +
hairy +  and glabrous +
0.15 cm1.5 mm <br />0.0015 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
long-creeping;ascending +
Thelypteris subg. Lastrea +
Thelypteris +
subgenus +
crescent--shaped +
simple +  and anastomosing +
short-creeping;suberect +
on rock +  and terrestrial +