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

NameAuthorSourceCitationYear
SEMIORBISPatrick image
Semiorbis catillifera(Morrow) G. Reid & D.M. Williams Diatom Research 25: 361 2010
Semiorbis eliasiaeM.B. Edlund, D.R.L. Burge, N.A. Andresen & D.D. VanderMeulen in Edlund et al. Diatom Research 36: 43, figs. 29-35, 51-53 2021
Semiorbis hemicyclus(Ehrenberg) Patrick image
Semiorbis rotundusG. Reid & D.M. Williams Diatom Research 25: 358, figs. 4-8, 15-21 2010