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

Navicula digitoradiata f. linearisHustedt image
Navicula digitoradiata f. minorFoged image
Navicula digitoradiata f. obtusata(N.I. Karaeva) N.I. Karaeva Diat. Kasp. Morya: 158 1972
Navicula digitoradiata var. cubaensisFoged image
Navicula digitoradiata var. ellipticaHustedt ex Simonsen Atlas & Cat. Diatom Types Hustedt: 23, pl. 6: fig. 4 1987
Navicula digitoradiata var. minorKrasske image
Navicula digitoradiata var. rostrataHustedt Abh. Naturw. Ver. Bremen 31: 627, figs. 96, 97 1939
Navicula digitoradiata var. rotindusC.S. Singh image
Navicula digitoradiata var. striolataGrunow K. Svenska Vet.-Akad. Handl., ser. 4, 17{2}: 32, pl. II: fig. 30 1880