Sentence:  It is apparent that the production of <WSD>Oyster mushroom</WSD> in early 80's was negligible but due to simplicity of cultivation procedure and broad adaptability of different "Pleurotus species", the <WSD>Oyster mushroom</WSD> has emerged as a mushroom of significance and it is expected that the production will continue to increase especially in South-East Asian countries. 
Meaning of the word marked with <WSD> tags:  Any of several mushrooms of the genus "Pleurotus" cultivated for food.