Widén, Carl‐Johan;
Lounasmaa, Mauri;
Jermy, A. Clive;
Euw, Josef V.;
Reichstein, Tadeus
Die Phloroglucide von zwei Farnhybriden aus England und Schottland, von authentischem «Aspidium remotum» A. BRAUN und von Dryopteris aemula (AITON) O. KUNTZE aus Irland
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Media type:
E-Article
Title:
Die Phloroglucide von zwei Farnhybriden aus England und Schottland, von authentischem «Aspidium remotum» A. BRAUN und von Dryopteris aemula (AITON) O. KUNTZE aus Irland
Contributor:
Widén, Carl‐Johan;
Lounasmaa, Mauri;
Jermy, A. Clive;
Euw, Josef V.;
Reichstein, Tadeus
Published:
Wiley, 1976
Published in:
Helvetica Chimica Acta, 59 (1976) 5, Seite 1725-1744
Description:
‘The phloroglucinols of two fern hybrids from England and Scotland, of authentic ‘Aspidium remotum’ A. BRAUN and of Dryopteris aemula (AITON) O. KUNTZE from Ireland’.The phloroglucinols of Dryopteris aemula (AITON) O. KUNTZE from Ireland, of two Dryopteris hybrids from England (D. x brathaica FRASER‐JENKINS et REICHST. (in preparation) and D. x pseudo‐abbreviata JERMY) and of a sample of A. BRAUN'S original collection of ‘Aspidium remotum’ (= D. remota (A. BR.) DRUCE) have been analysed.D. aemula from Ireland gave the same results as plants recently obtained from the Azores, England, Madeira and northern France. D. x brathaica, a tetraploid hybrid found only once (1854) in England (Windermere), but still surviving in cultivation (in Oxford Botanic Garden), has long been confused with triploid apogamous D. remota, and until recently there has been some uncertainty as to which of the two plants the name D. remota (A. BR.) DRUCE should correctly be applied to. For morphological geographical and cytological reasons it has been assumed that D. x brathaica could be the hybrid of D. carthusiana (VILL.) H. P. FUCHS x D. filix‐mas (L.) SCHOTT. The chemical results are in accordance with this assumption. Also the phloroglucinols of D. x brathaica are different from those of the triploid D. remota. It is therefore possible to differentiate between old herbarium specimens of these two morphologically very similar plants by means of chemical methods, even when no fresh material is available for spore examination or cytological investigation. Chemical analysis of a piece of A. BRAUN'S original collection of ‘Aspidium remotum’ (deposited in Berlin) clearly showed that it contained exactly the same phlorglucinols as the triploid taxon. We consider this to be additional and final proof that the name D. remota is correctly attributed to the triploid apogamous taxon.D. pseudo‐abbreviata was assumed to be a hybrid of D. aemula x D. oreades Fomin (= D. abbreviata (DC.) NEWM.). Our chemical results strongly support the hypothesis that D. aemula is indeed one parent; they are less unequivocal for the second as they would fit not only for D. oreades but equally for D. pseudo‐mas (WOLLASTON) HOLUB et POUZAR (= D. borreri NEWM.). Spore morphology is more compatible with the latter.Improved methods are given for separating natural phloroglucinols on TLC. This allowed corrections of former results and led to the detection that the compound present in D. inaequalis [4r] and D. sacrosancta [4w] assumed to be trisaspidinol (8 in [4r]) in reality was trispara‐aspidin (14 in [4e]). This was confirmed by its NMR. spectrum and reductive cleavage.