it. Tliere are however some essential differences between 

 them, especially in the form of^the labellum, and in the far 

 greater degree of obliquity in the insertion of the back sepal 

 in A. epidendroides ; it is moreover probable from the dried 

 specimens of the latter that its flowers are whole coloured ; 

 I have subjoined a character by which it may be distin- 

 guished. 



In the same collection of unpublished drawings, belong- 

 ing to Baron Delessert, to which I have already referred (foL 

 1904), there is a figure of a third species of this genus. It 

 has oblong smooth not two-edged pseudo-bulbs, solitary much 

 larger scentless flowers, of which the sepals and petals are 

 yellowish green blotched with crimson, and the lip and 

 column pure white, with a faint purplish crescent-shaped 

 stain in the middle of the lip. M. Descourtilz found it on 

 the Cedrela in Brazil, in the district of Bananal. A variety 

 of it is mentioned by him with a pale lilac lip, the stain on 

 which is deep violet. He also represents the pollen masses 

 as each furnished with a separate caudicula ; if this is correct 

 it will be an additional reason for doubting how far that 

 character is of importance in distinguishing Genera. 



Of the dissections in the accompanying plate that in the 

 centre represents a magnified view of the column and the 

 base of the labellum ; the other the pollen masses with their 

 caudicle and gland seen from behind. 



A. epidendroides (Gen. & Sp. Orch. p. 139); pseudobulbis oblongis ancipi- 

 tibus, sepalls lineari-oblongis acutis, petalis obtusis concavis, labelli lobis 

 lateralibus rotundatis integerrimis, intermedio crenulato emarginato. Pa- 

 nama and Columbia occidentalis. 



A. lunata ; pseudobulbis oblongis compressis lasvibus, sepalis petalisque linea- 

 ribus obtusis patentissimis, labelli lobis lateralibus nanis intermedio piano sub- 



quadrato undulato, floribus solitariis. Brazilia. Sepala et petala luteo- 



viridia, sanguineo-maculata. Labellum album macula lunata in medio. 

 Flores inodori. 



