Cells solitary, as long as broad, median constriction deep, sinus linear, narrow, expanded near the isthmus; semicell subtrapeziform, apical view elliptic with a central, deep median depression, side view subpyramidal, focused internally has X-shaped similar to a chromosome, lateral margins divergent towards the apex; cell wall granulate, with rows of well-marked pits (scrobicle), each of them bearing a distinct pore, lateral margin granulate; chloroplast axial, 2 pyrenoids per semicell.
Cosmarium bromelicola differs from all other species of the genus by having subtrapeziform semicells with a central median depression at the apical region, and subpyramidal in side view, when focused internally is X-shaped, like a chromosome
o C3: cholesteatoma involving the retrotympanic space (Sinus tympani/subtympanic sinus; subpyramidal space) and/or with facial nerve involvement.
3 mm 11-15 cm 0[degrees], 30[degrees], 45[degrees] endoscopes are especially useful for the negotiation in the isthmus, sinus tympani, subpyramidal space, sinus subtympanicus, mastoid tip, retrofacial cells etc.
Erect to semi-erect, 10-30 cm, softly hairy, yellow-green, leaves opposite and elliptical to lanceolate with a distinct centre-line, five-petaled white flowers widely separated, fruit a rounded subpyramidal
Inflorescence laxly bipinnate, 1.5-2 m long, subpyramidal
, rachis glaucous, glabrous, covered by whitish wax as the scape; primary bracts triangular, acuminate, up to 5 cm long and ca.