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

Tetraplektron acuminatum(Pascher) Fott image
Tetraplektron acutum(Pascher) Fott image
Tetraplektron acutum f. laeve_('laevis')(Bourrelly) Dedusenko-Shchegoleva image
Tetraplektron acutum var. laeve_('laevis')(Bourrelly) Fott image
Tetraplektron bourrellyiEttl image
Tetraplektron contortum(Bourrelly) Bourrelly Algues Eau Douce 2: 186 1968
Tetraplektron deniseaeM. Bittencourt-Oliveira Hoehnea 17{2}: 99 1991
Tetraplektron laevis(Bourrelly) Ettl image
Tetraplektron torsum(Turner) Dedusenko-Shchegoleva image
Tetraplektron torsum var. longispinumY. Thérézien Cryptog.: Algol. 8: 147, 150, pl. I: fig. 4 1987
Tetraplektron torsum var. longispinumY. Thérézien image
Tetraplektron tribulus(Pascher) A.R. Loeblich, Jr. image
Tetraplektron tribulus(Pascher) Fott image