FIGURE 4 in Biodiversity of Hawaiian Peyssonneliales (Peyssonneliaceae, Rhodophyta): new species in the genera Incendia and Seiria

FIGURE 4. Habit and morphology of Seiria mesophotica sp. nov. (A). Image of specimen fragments (BISH 780873) immediately after collection. (B). Image of specimen (BISH 780874) immediately after collection. (C). Radial vertical section (RVS) through thallus illustrating the basal hypothallus (arrow), and perithallial assurgent filaments (arrowheads) (BISH 780873). (D). RVS showing large lower perithallial cells (arrows) (BISH 780873). (E). RVS illustrating small, quasi-isodiametric uppermost perithallial cells (arrows) and thick cuticle (arrowhead) (BISH 780874). (F). RVS showing unicellular rhizoids extending from the basal hypothallus (BISH 780873). (G). View of the underside of the crust, illustrating the parallel files of cells comprising the hypothallus (BISH 780873). (H). View of the top surface of the crust, showing regularly sized cells, and a lack of hair cells (BISH 780873). (I). RVS through a tetrasporangial nemathecium, with immature (arrow) and mature (arrowhead) tetrasporangia (BISH 780873). (J). Close up of a tetrasporangial nemathecium, illustrating a tetrasporangium (arrow) and paraphyses consisting of up to nine cells (arrowheads) (BISH 780873). Scale bars: A-B = 1 cm; C-H = 50 µm; I = 100 µm.