34
Algae
environments. Flagellate cells bear two naked flagella, inserted either laterally or apically, which
may have different lengths. A structure apparently found only in algae of this division is the haptonema, typically a long thin organelle reminiscent of a flagellum but with a different ultrastructure.
The chloroplast contains only chlorophyll a, c 1 , and c 2 . The golden yellowish-brown appearance of
chloroplast is due to the accessory pigments such as fucoxanthin, β-carotene, and other xanthins.
Each chloroplast is enclosed within a fold of ER, which is continuous with the nuclear envelope.
Thylakoids are stacked in threes and there are no girdle lamellae. The nucleic DNA is scattered
throughout the chloroplast as numerous nucleoids. When present as in Pavlova (Figure 1.1ag),
the eyespot consists in a row of spherical globules inside the chloroplast; no associated flagellar
FIGURE 1.45 Thallus of Nitella sp.
FIGURE 1.46 Unicell of Helicosphaera carteri.
Algae
environments. Flagellate cells bear two naked flagella, inserted either laterally or apically, which
may have different lengths. A structure apparently found only in algae of this division is the haptonema, typically a long thin organelle reminiscent of a flagellum but with a different ultrastructure.
The chloroplast contains only chlorophyll a, c 1 , and c 2 . The golden yellowish-brown appearance of
chloroplast is due to the accessory pigments such as fucoxanthin, β-carotene, and other xanthins.
Each chloroplast is enclosed within a fold of ER, which is continuous with the nuclear envelope.
Thylakoids are stacked in threes and there are no girdle lamellae. The nucleic DNA is scattered
throughout the chloroplast as numerous nucleoids. When present as in Pavlova (Figure 1.1ag),
the eyespot consists in a row of spherical globules inside the chloroplast; no associated flagellar
FIGURE 1.45 Thallus of Nitella sp.
FIGURE 1.46 Unicell of Helicosphaera carteri.