a fungi grows on a stone

nature fungi fungus ostreatus vegetarian oyster mushroom leaves pleurotus beta glucan polyporaceae wood health austernpilz medicine porcini lecanora muralis crustose lichen placodioid apothecia taxon ascomycota lecanoromycetes lecanorales lecanoraceae moist mildew mold mould boletus toadstool stone thallus mellea rock saxicolous basalt pumice rhyolite granite sandstone limestone bark filament areolate grows pale yellowish green