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By: Valdespino, Iván A.Type: ArticleIn: PhytoKeysVolume: 159Series:Issue:Date: 2020Page Range: 71--113Publication Info: Pensoft Publishers 2020Subjects: Escudo guyanés esporófilos estróbilos Guiana Highlands heteromórficas heteromorphic New World non-articulate stems Nuevo Mundo South America sporophylls strobili Sudamérica tallos no articulados