There have some species of Oyster Mushrooms Pleurotus:
White oyster mushroom: Pleurotus florida – the white oyster mushroom, is white in color from primordia/pin head formation to maturity, and this mushroom also grows in bunches. The pileus of this mushroom is with thin margins, smooth and pileus thickness is lesser as compared to P. ostreatus and P. sajor-caju. The mushroom looks like a white disc, growing on a thick stipe with decurrent gills extending to the base of the stipe, unlike P. ostreatus/P. sajor-caju. This mushroom grew excellently well at 22-28°C temperature range but can grow up to 30°C. White oyster looks graciously white, with delicate flesh which is turgid in texture. The market ability of this mushroom is quite high with increased demand in the niche markets. These mushrooms are real gourmet mushroom, with high culinary value, and with intense mushroom aroma when used fresh.
Grey oyster mushroom: Pleurotus sajor-caju – the Grey Oyster mushroom, has its pileus color at pin head formation grey to dark grey in color. The color of the pileus changes to light grey on maturity, with fan shaped fruit body and thick texture. The fruit bodies are weighty when fully grown, and the pileus diameter may extend up to 4 inches. This Oyster mushroom is very commonly grown under seasonal growing conditions at temperature ranging between 20-28°C, but growth stops at air temperature above 28°C. This mushroom performs excellently when grown under controlled environment conditions.
Pink oyster mushroom: Pleurotus djamor, the Pink oyster mushroom looks gracious on the bed and yields profusely. The cultivation process for this mushroom is similar as described for P. sajor-caju, excepting that this mushroom requires limited water spraying during its cropping. The mushroom pileus is thinner as compared to above species, leathery in texture and looks like a pink queen on the beds. The pileus is up to 3-4 inches in diameter, with little or no stipe and pileus thickness is 3-4 mm at the outer edges. Outer boarder on pileus top is pink, gills on the lower side are pinkish too. This mushroom is not fleshy as compared to above described species. It fruits profusely at lower and higher air temperature of18-20 to 28-32°C .
Black oyster mushroom: Pleurotus ostreatus, one of the most popular species of Oyster Mushrooms Pleurotus spp., is the Black Oyster mushroom, as the pileus is black in color at the time of primordia/pin head formation. The entire process of its cultivation is similar to P. sajor-caju, except that this mushroom grows in vertically long bunches, with bunch growing in acro-petal order (lower mushrooms younger/smaller, upper mushrooms larger). It is also called Hiratake mushroom in Japan, and this mushroom loves the lower temperature range of 18-22°C. It is a prolific yielder, and yields 20-25% mushrooms of wet weight of substrate over a cropping period of 3-4 weeks. The mushroom shows distinct black color when young, which turns lighter on maturity. It is harvested in bunches, and packed/marketed like P. sajor-caju. This mushroom is in greater demand because of its velvety look/texture and excellent aroma.The diameter of the pileus of this mushroom is 2-3 inches,but mushroom length comprising of pileus and stipe is about 3-4 inches. The entire length of this mushroom is fleshy in texture, with decurrent gills on lower side. The fruit body looks like a horse shoe. This mushroom has preferred marketability value, and is readily accepted in the market by the consumers and the executive chefs of star hotels for its excellent taste.
Yellow oyster mushroom: Pleurotus citrinopileatus, is a beautiful yellow/orange coloured oyster mushroom, growing in large bunches on the substrate and looks very attractive on the bed and grows in typical accropital order. Its fruiting body is large (2-4 inches dia) and velvety to touch, fleshy and yellow to yellow orange in colour. The cultivation process for this mushroom is similar as described for P. sajor-caju. The mushrooms have along stipe with decurrent gills. This mushroom grows profusely on pasteurized wheat straw substrate supplemented with rice/wheat bran. The mushrooms are yellow or light orange coloured when young but colour turns lighter on maturity of mushroom. This mushroom also requires light for fruit body development. This mushroom yields 18-22kg fresh mushrooms in 3-4 weeks of cropping. It prefers a temperature shade higher than other oysters like pink,black and grey, and is closer in temperature preference to white oyster.