The INA is a card file and online reporting system maintained at the Silva Center for Phycological Documentation of the University Herbarium, University of California, Berkeley. It contains nearly 200,000 names of algae (in the broad sense).
The BPU is a card file containing bibliographic references pertaining to algal taxonomy.
Bibliographia Phycologica Universalis
DRUART, J.-C., & F. STRAUB
1993 (July 31) ('1992') Achnanthes calenata Bily et Marvan, (Diatomophyceae), Diatomée planktonique nouvelle pour les eaux douces Français
Cryptogamie, Algologie
14(2/3): 95-98, figs. 1-5