A general survey is given of the morphology and anatomy of the genus Placynthium. The species: aspralile, flabellosum, nigrum incl v. tantaleum, petersii, subradiatum, and stenophyllum are described in detail. The following new combinations are made: Placynthium filiforme, Placynthium aspralile, Placynthium subradiatum f. coerulescens, and Synalissa subnigra. The new variety Placynthium stenophyllum v. isidiatum is established.
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Aino Henßen (1963) studied this question.
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