und Tadeus Reichsteind) (13. I. 75) Uneercm Freund, Herrn Prof. F. Santavf (Olornouc), zu seincm 60. Geburtstag (23.4. 1975) gewidmet. Summary. Thc phloroglucinols of Dvyopevis aemda from the Azores and from Brittany (France), D. aaorica and D. crispifolia, a new tctraploid specks endemic t o the Azores [a], have been investigatcd. Thc following two species recently analysed with insufficient amounts of material have bcen reinvestigatcd using improvcd methods: D. maderensis and 'D. dilatata' from Tenerife, a new species cndemic t o the Canary islands and described by Gibby et al. [s] as B.guanchim Gibby & Jemy.W c have now found that both these specks also contain much albaspidin, particularly the homologuc BA. Former results for these. and other species differing in somc details were corrected (sec Table 1) after careful reexamination of the old chromatograms.D . aemulu from all origins contains relatively large amounts of two new compounds: aemulin(1) and trisaemulin (20), thc structures of which werc provcd by degradation, NMR.-and massspectroscopy. Trisaemulin was present as a mixture of two hornologucs BBB and BAB. The latter is the first three-ring phloroglucinol found in nature which carries am acetyl group in the middle ring. so far only butyryl-groups were found in this position.D. azodca is diploid like D. madevsnsis and D. inkrmedia and a11 3 taxa contain practically the same range of phloroglucinols. These facts are in agreement with conclusions based on morphology and cytology, which suggest that thew three taxa arc essentially cbnspecific.
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