Thanks to Guido for his comments about Xenia which seem to confirm that the
reference citation in the database 'Index Nominum Genericorum' for the
first publication of the genus name Aa is accurate :
Xenia Orchid. 1: 18. 1 Apr 1854
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From the info provided by Guido about Volume 1 of Xenia Orchidacea
["published between 1 April 1854 and 15 October 1858"]
one can deduce that it was published in fascicules.
It would be interesting to establish :
1) how many fascicules were published and on what dates ;
2) how many volumes of Xenia Orchidacea were published between 1858 and 1900.
Of course, that is something that someone who has access to Xenia
Orchidacea in its entirety would be able to clarify.
I will try and contact librarians.
*******
Regards,
Viateur
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