Staurophora brantii has rhombic-lanceolate valves with barely protracted apices. Staurophora tackei has smaller linear-lanceolate valves with apices that are broadly rounded but not protracted.
Diatoms of North America is running a fundraising campaign to keep the servers in operation. We need you to reach our $25,000 fundraising goal.
If you use and appreciate DONA, make your DONAtion today.
For the Gift Designation, type "diatom" in the search box and select "Diatom Lab Research Fund". This is the designated fund for diatoms.org.