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

SOLIUM(Heiberg) Schütt image
SOLIUMHeiberg image
Solium exsculptum f. pentagonaJousé ex R. Ross & P.A. Sims Bull. Brit. Mus. (Nat. Hist.), Bot. 16: 274 1987
Solium exsculptumHeiberg Conspect. Diatom. Dan.: 52, pl. IV: fig. X 1863
Solium exsculptum var. pentagonale_('pentagonalis')Kitton ex Walker & Chase Notes on some new and rare diatoms [I]: 5, pl. 1: fig. 10 1886