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Guide to Staurosirella pinnata

(Ehrenb.) D.M.Williams and Round 1987

Staurosirella Pinnata Guide
Credit: Eduardo Morales
  1. Valves oval
  2. Areolae lineolate
  3. Costae with spines

Striae are composed of pronounced lineolate areolae; costae are narrow. Solid spines are positioned on the costae. In the SEM, spines are conical at the base, becoming spatulate near the terminus. Porefields are absent.