"Tetraphis pellucida " is characterized by having a straight smooth-lacking protrusions-seta.
2.
Whereas " Tetraphis geniculata " is charecturized by having a papillose or tuberculate surface in the upper portion of a sharply bent seta.
3.
Upon further examination " Tetraphis geniculata " has bulging cell walls that are common in the central region of the seta, and smooth directly below the torsion of the seta is also common.
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