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

SYRINGIDIUMEhrenberg Ber. K. Akad. Wiss. Berlin 1845: 357 1845
Syringidium americanumBailey image
Syringidium bicorneEhrenberg Ber. K. Akad. Wiss. Berlin 1845: 365, no fig. 1845
Syringidium cucullatumL.W. Bailey image
Syringidium daemonGreville image
Syringidium eximiumGrunow image
Syringidium gracileEhrenberg image
Syringidium occidentaleBailey nom. prov. image
Syringidium palaemonEhrenberg image
Syringidium paraenseL.W. Bailey image
Syringidium poyseriBoyer image
Syringidium simplexBailey image
Syringidium ventricosumEhrenberg image
Syringidium wittiiGrunow image