# Index Filicum

> series of botanical indices on ferns, started by Carl Christensen, published 1906–1997

**Wikidata**: [Q123126726](https://www.wikidata.org/wiki/Q123126726)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Index_Filicum)  
**Source**: https://4ort.xyz/entity/index-filicum