Pleurotus ostreatus - A scanning electron micrograph image of a portion of the hymenium. - http://www.apsnet.org/online/Archive/1998/sem088.htm
California Fungi: Pleurotus ostreatus - Commonly known as the oyster mushroom, photograph and description of this edible species, further comments and links to other photographs. - http://www.mykoweb.com/CAF/species/Pleurotus_ostreatus.html
Pleurotus ostreatus: Oyster Mushroom - Photograph and information on this species, the fruitbody of which can produce a hundred million spores an hour. - http://www.uoguelph.ca/~gbarron/MISCELLANEOUS/july01.htm