 The mycorrhizal associations of several Sclerodermatineae genera have been established . Studies have demonstrated that Astraeus , Pisolithus , and Scleroderma form ectomycorrhizal associations with both angiosperms and <unk> . Previously thought to be <unk> , the <unk> were determined to be ectomycorrhizal with <unk> and <unk> using isotopic and molecular analyses . Species from the genera Pisolithus and Scleroderma have been used in forestry as mycorrhizal <unk> to help promote the growth and <unk> of young seedlings . 
