Geodesic
Studies in plant morphology by scanning electron microscopy and applications to plant species of pharmaceutical interest. Comparative research on differential microcharacters of the dried, powdered flower heads of Arnica montana L. and of two adulterant species
Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 66 (1979) no. 2, pp. 143-147 
Cappelletti, Mariella. Studies in plant morphology by scanning electron microscopy and applications to plant species of pharmaceutical interest. Comparative research on differential microcharacters of the dried, powdered flower heads of Arnica montana L. and of two adulterant species. Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 66 (1979) no. 2, pp. 143-147. http://geodesic.mathdoc.fr/item/RLINA_1979_8_66_2_a6/
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     title = {Studies in plant morphology by scanning electron microscopy and applications to plant species of pharmaceutical interest. {Comparative} research on differential microcharacters of the dried, powdered flower heads of {Arnica} montana {L.} and of two adulterant species},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
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Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

Un esame comparativo dei microcaratteri delle infiorescenze di Arnica montana, Calendula officinalis ed Anthemis tinctoria per mezzo del microscopio elettronico a scansione, ha permesso di stabilire che a livello delle superfici epidermiche abassiali di brattee involucrali e ligule, nonché a livello dell'epicarpo degli acheni, sono presenti particolarità che consentono l'identificazione delle tre specie anche disponendo di campioni di droga polverizzata.

[1] J. Baagøe (1977) - Microcharacters in the ligules of the Compositae, in: «The Biology and Chemistry of the Compositae», (V.H. Heywood, J.B. Harborne and B.L. Turner, Eds), Academic Press, London and New York, 1, Chapter 7, 119-139.

[2] E.M. Cappelletti (1978) - Studies in plant morphology by scanning electron microscopy and applications to plant species of pharmaceutical interest. Inflorescences of Arnica montana L. subsp. montana, «Rend. Acc. Naz. Lincei, Cl. Sc. mat., fis. e nat.», 65 (6), 333-337.

[3] E.M. Cappelletti (1979) - Studies in plant morphology by scanning electron microscopy and applications to plant species of pharmaceutical interest. Inflorescences of Calendula officinalis L. and Anthémis tinctoria Z., «Rend. Acc. Naz. Lincei, Cl. Sci. mat., fis. e nat.», 66 (1), 51-56. | fulltext bdim

[4] E.M. Cappelletti Paganelli (1979) - Caractères morphologiques différentiels entre les capitules de Tanacetum cinerariifolium (Trevi) Schultz Bip. et de sa falsification Leucanthemum vulgare Lam. au microscope électronique à balayage, «Plantes méd. et Phytothérapie», 13 (1), 13-20.

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[13] T.E. Wallis (1960) - Text-book of Pharmacognosy, 4a Ed., Churchill Ltd. Ed., London.