An alternative form of haploperistomic, describing mosses with a single ring of peristomial teeth.
From Greek 'haplous' (single) + 'peristomous' (having a mouth-ring). A variant botanical term with the same meaning as haploperistomic.
Botanical terminology sometimes has multiple correct names for the same thing—this shows how scientific languages evolved as different researchers described the same structures in slightly different ways.
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