beard lichen or usnea barbata, vintage engraving

alga algae ancient antique art artwork ascomycete ascomycota barbata beard black composite cyanobacterium drawing engraved engraving environment etching extreme fungi fungus green illustration lichen man mans mycobiont nostoc old organism parmeliaceae photobiont photosynthesis photosynthetic phycobiont picture symbiont symbiosis symbiotic trebouxia treemoss usnea vector vintage white