CdiNTKlHUTlONS TO THE ORCHIDACEOUS FLORA 

 OF QUEENSLAND. 



No. 1.* 



By E. 8. RoGEES, M.A., M.D., and C. T. White, F.L.S. 



[Read before the Roijal Society of Queensland, 30th Atigust, 



1920). 



Acianthus amplexicaulis (Bail). Rogers and White, 

 n. comb. 



(Text-fig. 1.) 



Microstijlis amjilexicaulis, Bail., Bull. Xo. 9, Dept. Agric, 



Brisbane (1891), p. 18. 

 Lister a amjjhxicatilis Bail., Queensl. Flora. V. 156 



(1902). 



Eudlo Creek, F. M. Bailey (Field Xaturalists' Club 

 Excursion, March, 1891). 



This plant, originall}' placed in the genus Microstylis 

 hy the late F. M. Bailey, and sul)sequently removed by 

 him to the genus Listera, is more correctly referable to the 

 genus Acianthus. 



This species may be distinguished from other Austrahan 

 members of the genus by the shape of its dorsal 

 sepal ; this is narrow linear, and shows no tendency to 

 '' hooding," which is so characteristic of all the others. 

 Even in A. caudatus the base of this sepal is cucuUate, 

 although the apex is prolonged into a tail. The lobulation 

 of the leaf is interesting, because tliis condition in lesser 

 degree is not unfrequently met with in Acianthus. In 

 A. caudatus, one of us (R.S.R.) has seen a specimen in 

 which there are no fewer than five well-defined lobules. 



*The present jiapei' is the fir.st of a series of contributions to our 

 knowledge of Queensland orchids, and is the result of a critical examina- 

 tion of material in the Queensland State Herbarium. In addition to 

 descriptions of new species and critical notes, the opportunity is taken 

 of recording any locality records that add to our knowledge of the 

 distribution of an}- particular species. 



