Cell wall: generally contains cellulose (1-10% of thallus dry-weight), alginic acid, and sulfated polysaccharides
Plastids: varies among genera – may be from one to many per cell; typically have a girdle lamella; have a periplastidal endoplasmic reticulum, which is continuous with the nuclear envelope
Pigments: fucoxanthin, which gives the algae their characteristic greenish-brown color; chlorophyll a; chlorophylls c1 and c2; beta-carotene; and violaxanthin
Photosynthetic reserve product: laminarian
(Lee, 1999; Graham & Wilcox, 2000)
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