Pleurotus ostreatus 'Florida' was grown in submerged liquid culture. The biomass yield of the fungus, grown
for 3 days in 2-liter fermentors, where the mycelial pellets measuring 5 mm in diameter were formed, was 11.7
g (dry weight)/liter. Comparing the chemical constituents of fruiting bodies produced on cotton straw and
mycelial pellets revealed several similarities in total nitrogen, protein, glycogen, fatty acids, RNA, and ash
content. Differences were observed in the contents of six amino acids. Although the total fatty acid content was
similar, there were more saturated fatty acids in the mycelium. Cell wall composition, typical for
basidiomycetes, was observed in both mycelium and fruiting bodies, with laminarin as the main polymer.