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

Heterothamnion platythaliaeA. Athanasiadis Opera Botanica 128: 186, figs. 95-97 1996
PLATYTHALIASonder Bot. Zeit. 3: 51 1845
Platythalia angustifoliaSonder Bot. Zeit. 3: 51 1845
Platythalia brandegeei(Setchell & Gardner) Womersley image
Platythalia brandegeei(Setchell & N.L. Gardner) Womersley Austral. J. Bot. 12: 104 1964
Platythalia quercifolia(R. Brown ex Turner) Sonder Bot. Zeit. 3: 51 1845
Platythalia quercifolia(Turner) Sonder image