ORCHIDACE.E 



sac, correspond in their position to the carinae or thickened lines 

 of other species. They are interneural. 



It would seem that conclusive proof that the palaeotropical 

 and neotropical species constitute a single genus would be estab- 

 lished, if in connection with the similarity of the structures of the 

 gynostemium and perianth, carinae or papilliform emergences 

 could be found in representatives of the group taken from both 

 hemispheres. Erythrodes W^enzelii Ames from the Philippines has 

 a conspicuously bilobed sac, and is provided with carinae which 

 in form and position resemble very closely those of E. purpurea 

 Ames from Guatemala. The carinae alternate with the central 

 nerves, the outer pair situated higher up on the sac than the inner 

 pair. In E. Weberi Ames, a native of the Phihppines, the anterior 

 wall of the sac is also provided with carinae which are similar 

 in appearance and position to those of ^. argyrosticta (Schltr.) 

 Ames from Guatemala. It seems inconceivable that the evidence 

 offered by these carinae should be disregarded. In my estimation 

 they indicate a kinship that geographical bounds cannot alter. 



The following changes in nomenclature are supplementary to 

 those made in Fascicle V of this work on pages twenty-eight and 

 twenty-nine. 



Erythrodes aratanhensis (Rodr.) Ames comb. nov. Physu- 

 rus aratanhensis i2oc?r. Orch. Nov. 2 (1882) 290. 



Erythrodes arietina {Eeichb.f. S^ Warm.) Ames comb. nov. 

 Physurus arietinus Eeichb.f. <§ Warm, in Reichb. f. Otia Bot. 

 Hamb. 2 (1881) 52. 



Erythrodes argyrosticta (Schltr.) Ames comb. nov. Physu- 

 rus argyrostictus Schltr. in Fedde Repert. 16 (1920) 440. 



In the structure of the flowers this species bears a close re- 

 semblance to E. purpurea Ames. In habit, however, it is readily 



recognized by the shortness of the peduncle between the lower- 



[66] 



