Sori rotundi dorsales. Involucrum reniforme sinu affixum, marginibus liberis. 24. NEPHRODIUM MICROSORUM, frondibus deltoideis tripinnatis membranaceis glabris, pinnulis decurrenti-coadunatis oblongis obtusis incisis pinnatifidisve, lobis acutiusculis serrato-incisis, stipite basi aculeato, rhachi costisque puberulis. Aspidium microsorum _Kaulf! in Sieb. synops. filic. n._ 101.