Relating to or belonging to the group of fungi that have autobasidia as their characteristic spore-bearing structures.
From 'autobasidiomycete' plus the adjectival suffix '-ous' (from Latin). The suffix turns the noun classification into a descriptive adjective.
Scientific adjectives like this show how specialists compress complex information into single words—'autobasidiomycetous' tells you exactly how this fungus reproduces, but only if you speak the language of mycology.
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