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Table 3 Comparisons of vegetative and sporangial structures among the species of Exallosorus , Homoeostrichus and Zonaria

From: Morphological and molecular characteristics of Homoeostrichus formosana sp. nov. (Dictyotaceae, Phaeophyceae) from Taiwan

Characters H. formosana H. canaliculatus H. sinclairii E. harveyanus E. olsenii Zonaria spp.
Thallus thickness 88–100 μm 150–200 μm 105–180 μm 120–170 μm 90–115 μm 66–300 μm
No. of cell layers 2–4 6–7 4–7 6 4–6  
Cortical /Medullary cells 1 1(2) 1(2) 1(2) 1(2) 2(1)
Sporangia Tetra-, Single unknown Tetra-, Sorus Tetra-, Sorus Tetra-, Sorus Octo-, Sorus
Indusium - x - + + +
Paraphyses - x Brown, in sorus - Brown, near sorus Whitish, in sorus
Stalk cell 1 x Multicellular 1 1 -
Oogonia unknown unknown Sorus unknown Sorus Sorus
Indusium x x - x + +
Paraphyses x x Brown, among oogonia x Brown, near sorus -
Stalk cell x x - x 1 1
Antheridial sorus unknown unknown sorus unknown sorus sorus
Sorus border x x Brown paraphyses and sterile filaments x Cortical cells Slightly elongate sterile cells
Stalk cell x x 1 x 1 1
References f b b, c, d, e a, e b, d, e b, c, d, e
  1. ,1964; b: Womersley, 1987; c: Phillips et al., 1994; d: Phillips and Clayton, 1997; e: Phillips; 1997; f: This study. +: Present, -: Absent, x: not found.