Prof. Lindley on new Orchidaceous Plants. 107 



A beautiful species, with flowers almost half an inch long, and 

 apparently jiurple. It would be a PlrurothalUs if its petals were not 

 truncated and dwarf. 



24. Steljs brevilabris ; caulescens, folio lineari-lanceolato mucro- 

 nato, spicis quadruplo long-ioribus solitariis erectis sccundis strictis, 

 bracteis cusi)idatis internodiis brevioribus, sepalis lateralibus acutis 

 supremo oblongo brevioribus. 



Popayan ( H art weg) . 



Related to St. ascendens and lamellata, but easily distinguished by 

 the drooping, ringent, almost S-lijjped flowers. Can it be St. clon- 

 gata, H. B. K. ? but the description does not agree. 



25. Pleukothallis co«i'o/M/a ; folio coriaceo convoluto, spicis plu- 

 ribus folio brevioribus erectis, floribus kcvibus, sepalis marginatis 

 lateralibus ultra medium connatis, petalis duplo brevioribus obtusis 

 diaphanis, labello longiore complicato apice spathulato acuto infra 

 medium utrinque dilatato rotundato. 



Popayan (Hartweg). 



26. Pleurothallis galeata ; caule medio louge et laxe vaginato, 

 folio petiolato cordato-oblongo obtuso, spatlia subcoriacea obtusa, 

 spicis filiformibus i)lurimis nutantibus folio brevioribus, sepalis la- 

 teralibus semiconnatis angustis erectis dorsali antico galeato mem- 

 branaceo, petalis linearibus sepalis paulo brevioribus, labello cucul- 

 lato rhombeo angulis rotundatis utrinque bilamellato apice crasso 

 calloso. 



Popayan (Hartweg). 

 Near PL macrophylla. 



27. Pachyphyllum squurrosum ; foliis recurvis squarrosis, labello 

 obsolete trilobo callo a marginibus longe distante. 



Popayan (Hartweg). 



Much like P. distkhum, except in the leaves and the form and 

 callosity of the label lum. 



28. DiALissA, gen. nov. StcU proximum. Calyx tubulosus, bilabiatus, 

 antice ventricosus ; labio altero bifido revoluto. Petala nana. La- 

 bellum indivisum, rectum. Columna nana, recta, biauris. Pol- 

 linia 2. 



DiALissA pulchella. Spithamsea et ultra, ca^spitosa. Caules teretes, 

 monophylU, vaginis tubulosis membranaceis glabris vestiti. Fo- 

 lium petiolatum, lanceolatum, striatum, acutissimum, tridentatum ; 

 racemo striato, basi distanter vaginato triplo brevius. Bracteee 

 5 pollicares, falcatae, acutissimse, perfoliatae, canaliculatse, glabrae, 

 distichse, floribus glabris sequales. Sepalum supremum subcorda- 

 tum, erectum. Petala rhombea. Labellum spathulatum, rotun- 

 datum, linea transversa elevata. 



Popayan (Hartweg). 



29. Gastropodium violaceum. Ramosum, distiche foliosum, foliis 

 carnosis linearibus obtusis mucronulatis, vaginis striatis transverse 



12 



