954 BULLETIN DE L'HERBIER BOISSIER. (86) 



D. Kerstenii wächst auf dem Humus der Urwälder auf dem Horstbosch- 

 Gebirge in Transvaal; daselbst sammelte ich sie in Gemeinschaft mit 

 der D. anthoceros Rchb. f. in reichlicher Menge. 



40. Disperis oppositifolia Sw. 



Herba erecta, pusilla, glaberrima, 8-17 cm. alta; caule stricto vel sub- 

 stricto, debili, basi incrassata vaginis 2-4 brevibus arcle vaginantibus 

 acuminatis, vestito, dimidiosuperiorebifoliato, apice 1-5-floro; foliis sub- 

 oppositis patentibus, ovato-lanceolatis vel lanceolato-triangulis acutis, 

 subsessilibus, subaequimagnis, 1,5-3,5 cm. longis, infra medium 1-2 cm. 

 lalis; floribus subcorymbosis, in génère vix inter médiocres, erectis vel 

 suberectis; sepalis lateralibus patulis, basi plus minus connatis, e basi 

 angustata oblique lanceolato-ellipticis acutis, 0,8-0,9 cm. longis, supra 

 medium 0,4 cm. latis, medio fere sacculo brevissimo obtuso donatis, 

 sepalo dorsali lineari apicem versus angustato obtusiusculo, cum petalis 

 infra marginem sepali dorsalis agglutinatis, semi-ovatis acutis basi semi- 

 cordatis, concavis, sepalo dorsali sequilongis (0,8 cm. longis), medio fere 

 0,4 cm. latis, galeam obtusam concavam formante; labello erecto, e basi 

 lineari, rostello alte adnato, medio fere utrinque auriculo minuto denti- 

 formi acuto, ornato, apicem versus supra rostellum recurvo, dilatato, apice 

 bicruri, cruribus semilunato-divergentibus, linearibus, dense papillosis 

 apice incrassatis, infra apicem antice in apendicem dentiformem acutum 

 refracto-decurvum, producto; rostello satis magno transverso, apice 

 retuso, marginibus reflexis; ovario gracili, subcylindrico, apice rostrato, 

 1,1-1,3 cm. longo, glaberrimo. 



Disperis oppositifolia Smith, in Ree's Cycl. XI (1809), n. 6; Ldl., Gen. 

 Spec. Orch. (1839), p. 371 ; S. Moore, in Bak., Fl. Maur. Seych. (1877), 

 p. 331. 



Dryopeia oppositifolia Thouars, Orch. Afr. (1822), t. 1 ; A. Rieh., Orch. 

 Maurit. (1828), p. 35.' 



Disperis Humblotii Rchb. f. in Flora (1885), p. 377. 



Habitat in insulis Comoro, Mascarensibus et Madagaskar. 



In insulis Comoro : Loco speciali haud indicato. — L. Humblot, n° 218. 



In insulis Mascarensibus : In umbrosis in cacumine montis «The 

 Pouce» appellatse. — Ayres; Quartier Militair et Anse Courtois, in insula 

 Mauritius. — Bojer, Capt. Carmichsel, Comerson; In insula Borbonia. — 

 Thouars. 



In insula Madagascar. 



Loco incerto : Thouars. 



