Octubre 2001 PACETTI and RIESS Endophytes of Serapias pai'illora and Spiranthes spiralis


 Figure 15. S. spiralis epidermal root cell penetrated by
B-Sepa-1 (SEM, x 1,000).


 L .. tJdw~~fRV^5


 Figure 16. B-Sepa-1 pelotons in S. spiralis root cells
(confocal laser microscope, x 40).


 Figure 17. B-Sepa-1 pelotons in a S. spiralis root sec-
tion (SEM, x 500).



 The different pattern of infection of the two
fungi in S. spiralis could also suggest that there is a
fungal succession in this host, and that A-Sepa-1
can not induce symbiosis in S. spiralis in the phase
of development studied.

LITERATURE CITED
Andersen, T. F. 1996. A comparative taxonomic study of
 Rhizoctonia sensu lato employing morphological, ultra-
 structural and molecular methods. Mycol. Res. 100:
 1117-1128.
Bernard, N. 1909. L'evolution dans la symbiose. Ann. Sci.
 Nat. Bot. 9, ser. 9: 1-196.
Burgeff, H. 1936. Samenkeimung der Orchideen. G.
 Fischer, Jena.
Curtis, J.T. 1937. The relation of specificity of Orchid


 Figure 18. S. spiralis root section with B-Sepa-1 inva-
sion area (confocal laser microscope).

 mycorrhizal fungi to the problem of symbiosis. Amer. J.
 Bot. 26: 390-398.
Downie, D.G. 1943. Notes on the germination of
 Corallorhiza innata. Trans. Bot. Soc. Edinburgh 33:
 380-392.
 1959. The mycorrhiza of Orchis purpurella. Trans.
 Bot. Soc. Edinburgh 38: 16-29.
Dreyfuss, M. & 0. Petrini. 1981. Endophytische Pilze in
 Epiphytischen Araceae, Bromeliaceae und Orchidaceae.
 Sydowia 34: 135-148.