Xanthophyta (Yellow-green Algae)

PLANT GROUPS
(5)
Xanthophyta (Yellow-green Algae)
General characteristic of the Xanthophyta
1 Habitat Aquatic in Fresh water, & Damp soil
2 Pigment Chlorophyll a, c & e, Diadinoxanthin, Vaucheriaxanthin
3 Food reserves Fat & Oil
4 Cell wall Cellulose, Hemicellulose
5 Reproduction Asexual & Sexual in some forms Oogamous
6 Growth forms Flagellate, Coccoid, Colonial, Filamentous & Siphonaceous

? Due to absence chlorophyll b & accessory pigment fucoxanthin members appear greenish or yellowish-green.
? Flagella two unequal flagella, the longer is Pantonematic (forwardly directed) while the shorter one is Acronematic (posteriorly directed).
Division Xanthophyta
Class Xanthophyceae
Order Vaucheriales
Family Vaucheriaceae
Genus Vaucheria

Order: Vaucheriales
The members of this Order are multinucleate Siphonaceous (Coenocytic)
Vaucheria (Water felt) is filamentous alga has tubular Coenocytic axis with septa being laid down only when Gametangia or Sporangia are formed.
? Vegetative Reproduction by Fragmentation
? Asexual Reproduction by Zoo spore (Zoosporangia are produced at the tip of filament(
? Sexual Reproduction by Oogamy (Antheridium & Oogonium are borne on the side of a branch).