热带旧大陆的蕨类植物,具有密集的圆形孢子囊群,但没有囊群盖。
Tropical Old World ferns having closely crowded circular sori and no indusia .
裸蕨科的模式属;古生代植物,为小而坚韧的草木,具地下根状茎和顶生的孢子囊群。
Type genus of the Psilophytaceae : genus of small wiry herbaceous Paleozoic plants with underground rhizomes and apical sporangia .