Silva Center for Phycological Documentation: Index Nominum Algarum

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.
A working list of algal type specimens at UC is available here

Results from INA database

Cymbella microcephala f. intermediaWoodhead & Tweed image
Cymbella microcephala f. majorGrunow image
Cymbella microcephala f. robustaHustedt Ber. Deutsch. Bot. Ges. 56: 561, pl. XXV: figs. 14, 15 1939
Cymbella microcephala f. sublinearisT.W.G. Lund image
Cymbella microcephala f. subrostrataManguin image
Cymbella microcephala f. undulataFusey image
Cymbella microcephalaGrunow in Van Heurck Syn. Diat. Belg.: pl. VIII: fig. 36 1880
Cymbella microcephala var. crassaReimer image
Cymbella microcephala var. robustaHustedt image
Cymbella microcephala var. rostellataMayer image