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Plagiochila castellonis Gottsche ex Steph. and P. mandonii Gottsche ex Steph. are excluded from the synonyms of P. spinulosa (Dicks.) Dumort. and regarded as conspecific with P. stricta Lindenb ; P. striolata A. Evans is identified as a further synonym of P. stricta.
P. aequifolia Steph. is excluded from the synonymy of P. micropteryx Gottsche and is placed in the synonymy of P. patula (Sw.) Lindenb.; P. rara Gottsche is treated as a synonym of P. cuneata Lindenb. & Gottsche.