FIGURE 7 in Morphological and molecular systematic investigation of Laurencia karachiana sp. nov. (Ceramiales, Rhodophyta) from Karachi, Pakistan

FIGURE 7. Laurencia karachiana Bibi, Cassano & Rasheed sp. nov. (A) Tetrasporangial branches. (B) Detail of tetrasporangial branchlets. (C) Transverse section of tetrasporangial axial segment showing axial cell (a) and two fertile pericentral cells, the third and fourth (arrows); the other two pericentral cells remain vegetative (p). (D) Detail of fertile pericentral cell (fp) with two pre-sporangial cover cells (pr), tetrasporangium (te); post-sporangial cover cell (po). (E) Longitudinal section through apical portion of tetrasporangial branchlet showing origin of tetrasporangia (te) from axial cell (arrow), fertile pericentral cells (fp) and pre-sporangial cover cells (pr). (F) Longitudinal section through a tetrasporangial branchlet showing parallel arrangement of tetrasporangia. Scale bar: A, 2 mm; B, 1 mm; C-E, 25 μm; F, 100 μm.