نص أصلي - انجليزي - cells

cells 1 mm wide, 1mm long with shallow, notch-like sinus; lateral margin of semicells almost straight or only slightly convex, tapering to broad apices; walls smooth with fairly widely separated, quite distinctive punctae which above isthmus occur in 1 or 2 horizontal rows; chloroplasts star-shaped with irregular longitudinal ridges and conspicuous spherical, central pirenioids