ORCHIDACE.E 



anum, a plant which has all the distinctive floral characteris- 

 tics of § Acoridium and the lateral flower-shoot characteristic of 

 §Eudendrochilum. D. Woodianum bears the same relationship 

 to § Acoridium which §Eudendrochilum bears to §Platyclinis; 

 consequently I have assigned it to a new section in the follow- 

 ing conspectus, where it stands as a transitional section between 

 § Acoridium and §Eudendrochilum. 



CONSPECTUS SECTIONUM GENERIS DENDROCHILI 



A. Stelidia columnce nulla 



1. Pedunculus terminalis I. Acoridium 



2. Scapus lateralis II. Pseudacoridium 



B. Stelidia columnce conspicua vel rarissime 

 rudimentaria 



1. Scapus lateralis III. Eudendrochilum 



2. Pedunculus terminalis IV. Platyclinis 



Note. The stelidia of the column in § Platyclinis may be rudi- 

 mentary, and either basal or terminal. In the latter case they 

 may have the appearance of being segments of the terminal wing 

 which surrounds the androclinium. Examples of this are to be 

 found in D. Mearnsii, D. bicallosuDi, JD. Copelandii and D. gi'acili- 

 scapum, species which approach in aspect those of § Acoridium 

 and form, perhaps, a connecting group between § Platyclinis and 

 §Acoridium (cf. plates 21-24, Orchidace^, Fasc. ii). Dendro- 

 chilum (§ Acoridium) Foxworthyi, which resembles D. {^VIbXj- 

 c\m\s) graciliscapum Pfitz. in general aspect and is unique among 

 the species of § Acoridium because of its simple labellum, does 

 not possess stelidia. 



In § Platyclinis there is much similarity in the floral structure 

 of many species, which is extremely confusing and conducive to 

 the belief that specific distinctions have been too finely drawn. 

 As examples of this similarity, Z). uncatum Reichb. f., D. gracile 



[5] 



