Phytophthora infestans
Habitat
Phytopthora (Greek phyton = plant; phthora = destruction) is represented by 100 species.
Cosmopolitan in distribution.
Some species are facultative parasites and others as facultative saprophytes.
P. infestans, causing the disease called late blight of potato or Potato blight. 
The Irish Potato Famine during the year 1843-1846 in Ireland resulted in the death of millions of people.
Thallus Structure
The mycelium is coenocytic, aseptate, hyaline and profusely branched (monopodial branching).
The septa are formed at the time of reproduction or at maturity.
The cell wall consists of glucan chitin is, however absent.
Cytoplasm contains many nuclei, mitochondria, endoplasmic reticulum, ribosomes, dictyosomes, vacuoles and many oil globules.
The mycelium is intracellular, and directly kills the invaded cells.
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