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Systematics of Plagiochila sect. Glaucescentes Carl (Hepaticae) from tropical America: a morphological and chemotaxonomical approach

J. Heinrichs, H. Anton, S. R. Gradstein and R. Mues
Plant Systematics and Evolution
Vol. 220, No. 1/2 (2000), pp. 115-138
Published by: Springer
Stable URL: http://www.jstor.org/stable/23643767
Page Count: 24
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Systematics of Plagiochila sect. Glaucescentes Carl (Hepaticae) from tropical America: a morphological and chemotaxonomical approach
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Abstract

The systematics of the Glaucescentes Carl, a poorly known neotropical section of the large genus Plagiochila, is revised based on a large set of gametophytic, sporophytic and chemical characters. Three species are recognized, P. buchtiniana Steph., P. longispina Lindenb. and Gottsche and P. diversifolia Lindenb. and Gottsche, the latter with two chemotypes. Twelve binomina are reduced to synonymy. The species occur in montane regions of tropical America, especially in the northern and central Andes. In addition, P. longispina is newly reported from the Azores, where it was previously known as P. allorgei Herzog and Perss. The Glaucescentes are excellently characterized by morphological and chemical features and are clearly separated from the Contiguae Carl, a group often confused with the Glaucescentes. Morphologically, the Glaucescentes stand apart by the brown oil bodies, thinwalled inner capsule wall cells and partly unequally bispiral elaters. Chemically, they are characterized by the accumulation of partially hydrogenated bibenzylderivatives (longispinone, longispinol), 3-benzylphthalides and various flavonoids, and by the low production of terpenoids.

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