396 Prof. Lindley on new Orchidaceous Plants. 



28. Pachyodon pyramidatus. PI. XVI.* fig. 9. 

 Subtriangular cuneiform, somewliat pyramidal ; umbones 

 large, contiguous, extremely obtuse; anterior side very short, 

 abruptly descending and rounded below; posterior side elon- 

 gated, its superior line gradually descending to a blunt acumi- 

 nated termination, thick on the anterior side, and becoming 

 rapidly compressed posteriorly ; base acute, slightly flexuose and 

 thin at the edge ; surface with shallow irregular wrinkles ; thick- 

 ness equal to two-thirds its length. 



Ironstone shale at Low Moore; also in shale at Woodhall, 

 near Edinburgh. 



I am indebted to the following friends for the use of the above 

 specimens : — ^to Dr. Fleming, Broughton View, Pendleton, Man- 

 chester, for Nos. 24 and 25; Thomas Wm. Embleton, Esq., Mid- 

 dleton Hall, near Leeds, for 8, 14, 17, 20, 23 and 26, kindly 

 presented to me ; Mr. Samuel Gibson, Hebden Bridge, for 8, 

 14, 17, 20, 23 and 26; William Rhind, Esq., Surgeon, Edin- 

 burgh, for 9 and 19 ; W. C. Williamson, Esq., Surgeon, Man- 

 chester, for 18 ; and Mr. Robertson, Newcastle-on-Tyne, for 

 No. 12. 



XL VII I. — A Century of new Genera and Species of Orchidaceous 

 Plants. Characterized by Professor Lindley. 



[Continued from vol. x. p. 1 86.] 



Decade 2. 



11. Masdevallia minuta; folio lineari-lanceolato carnoso acute 

 scapo unifloro duplo breviore, floribus cylindraceis hinc gibbosis, 

 sepalis linearibus acuminatis aequalibus. 



Surinam (Hostmann, no. 151). 



The whole plant only two inches high, flowers included. Flowers 

 apparently dull orange. Petals bidentate. Lip linear, very slightly 

 unidentate on each side. 



12. SteijIS, pauciflora ; folio obovato-lanceolato obtuso tridentato in 

 petiolum angustato, spica solitaria nutante folio subaequali, floribus 

 distantibus, bracteis acuminatis, sepalis subrotundis subaequalibus 

 ciliatis intus pilosis, petalis ciliatis labelloque carnosis. 



Brazil (Miers). 



Leaf about 2^ inches long. Flowers four or five on a raceme, about 

 half an inch apart. 



13. Stelis Miersii ; folio lineari spathulato obtuso plano-convexo 

 emarginato, spicis subsolitariis folio subaequalibus secundis, brac- 

 teis ovatis apiculatis, sepalis ovatis supremo minore lateralibus 



