Lichens
"Logically regarded as a another class of fungi, the lichens are mostly Ascomycetes that have obligate symbiotic relationships with unicellular algae which multiply within their densely packed hyphae. A very few lichens appear to involve Basidiomycetes. About 17,000 described species."
Biology of Plants, Fourth Edition, Worth Publishers Inc., Stanford University, Peter H. Raven and Helena Curtis, ©1971
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