vi INTRODUCTION 



Pfitzer's monograph of the Coelogyninae. It was not possible for me to 

 comply with this request, but, as engravings of the eighteen new species 

 of Dendrochilum published under Acoridium in the Proceedings of the 

 Biological Society of Washington were being made in Paris for fascicle 

 2 of Orchidaceae, I arranged for a set of these to be sent to Dr. Engler. 

 The last thought in my mind when I did this was that my confidence 

 would be abused, and that parts of my plates would be surreptitiously 

 converted into illustrations for Das Pflanzenreich before I myself had 

 seen the engraver's final proofs. 



If permission for the use of the plates had been requested, opportunity 

 would have been given for a friendly cooperation which would have saved 

 Dr. Pfitzer's monograph from unfortunate errors in citation, and would 

 have eliminated the disagreeable necessity on my part of explaining away 

 inconsistencies in the present work, over which I have had no control. 



In every case where fascicle 2 of Orchidaceae (ined.) is cited in Dr. 

 Pfitzer's monograph, Acoridium and not Dendrochilum is given as my con- 

 ception of the generic rank of my species. As the paper entitled Orchi- 

 daceae Halconenses (which was prepared early in 1907) clearly shows, I 

 no longer adhere to my former views of Acoridium, but agree with J. J. 

 Smith 1 in regarding Acoridium, Platyclinis and Dendrochilum as conge- 

 neric. This was also clearly expressed under Dendrochilum on pages 12 

 and 77 of the present volume, when they were prepared for the press in 

 January, 1907. 



Dr. Pfitzer's death, which occurred in December, 1906, led to the 

 selection of Dr. Fritz Kranzlin to complete the work on the Ccelogyninae 

 for Das Pflanzenreich ; consequently Dr. Kranzlin is responsible for the 

 unfortunate complications which have arisen through the unwarranted 

 liberty taken with my plates and for the total disregard of my views 

 of the eighteen species which the plates represent. Notwithstanding 

 the fact that the titles on the plates are given under Dendrochilum, Dr. 

 Kranzlin has referred to them under Acoridium, and has neglected en- 

 tirely my paper on the orchids of Mt. Halcon. Here, however, it is 

 well to give Dr. Kranzlin the benefit of any doubt, in so far as the plates 

 submitted to him by the engraver were not sent to me for verification. 



Before I pass from a consideration of the use made of my plates, it is 

 necessary that several misleading errors into which Dr. Kranzlin has 

 fallen regarding them should be cleared away. Fig. 38 of the Ccelogy- 



1 Notwithstanding J. J. Smith's monograph of Dendrochilum in Recueil des Travaux Bot. 

 Neerl. no. 1 (1904), the fact is overlooked by Pfitzer & Kranzlin that in that monograph the 

 combinations D. corrugatum, D. Kingii, D. rufum (" rufa ") and D. grandiflorum are made for 

 the first time. 



