158 MEMOIRS OF THE NEW YORK BOTANICAL GARDEN [VOL. 10 



in ramulis terminates (in fructu demum laterales) plerumque 1-2; pedicelli ad 

 anthesim 1.5-2.5 mm longi demum (in fructu) 2-3 mm longi hypanthio sparse 

 glanduloso-setulosi ad basim inconspicue bracteolati. Hypanthium (ad torum) 

 2 mm longum leviter 8-costatum; calycis tubus 0.5 mm altus, lobis 1-1.2 X 2 mm 

 obellipticis apice rotundatis ad margines brevissime glanduloso-setulosis extus 

 sparse vel modice setulosis et tuberculo brevi non eminenti armatis. Petala 

 4.5-5 X 1.5-1.8 mm oblonga apice hebeti-acuta et cum setula glandulifera 

 (glandula caduca) 0.5 mm longa praedita. Stamina isomorphica ; filamenta 2.1 

 mm longa ; antherarum thecae 1.9 mm longae anguste oblongae, conneetivo 0.6 

 mm prolongato, appendice dorsali filiformi acuta 0.8 mm longa. Stylus 5 X 0.15 

 mm; stigma truncatum ; ovarium glabrum 3-loculare apice vix (0.2-0.3 mm) 

 depressum et inconspicue trilobatum. Fructus hypanthium ca. 4 mm longum ; 

 semina 0.6-0.7 X 0.25 mm pyramidata recta inconspicue striata et apicaliter 

 tuberculata. 



Type. Buds pinkish white, locally frequent on mossy logs near Base Camp 

 above Rio Oaruai, slope forest of Tirepon-tepni, Chimanta Massif, Edo. Bolivar, 

 Venezuela, alt. 1100 m, 1 Jan 1953, John J. Wurdack 34018 (holotype US 

 2342481). Paratypes. VENEZUELA, Edo. Bolivar. Gran Sabana : km 105-118 

 between El Dorado and Sta. Elena, Foldats 12841 (YEN) ; headwaters of Rio 

 Venamo on northern slopes of Cerro La Danta NW of Cerro Venamo, elev. 1040- 

 1060 m, Steyermark & Nilsson 1. BRITISH GUIANA, Pakaraima Mts. Merume 

 Mountain: Partang River, alt. 1140 m, Tillctt, TUlett, & Boyan 43951. 



M. vestitum has pedicels 1.8-2 cm long. Another relative, M. minus Gleason, 

 has similar short pedicels, but generally smaller leaves which are glabrous or 

 very sparsely strigulose marginally on the upper surface and glabrous except for 

 a very few setae along the midvein on the lower surface ; the petals lack a 

 terminal seta. Both relatives are distinguishable vegetatively from M. brevi- 

 pediceUattim by the large pale pustular "dots" (ca. 0.3- mm diam) on the 

 lower leaf surface; the minute white dots of M. brevipedicellatum are only 

 0.05 mm diam. 



Macrocentrum anfractum AVurdaek, sp. nov. 



M. gesneriaceo Sandw. et M. minori Gleason affinis sed petalis apice glandu- 

 loso-setosis. 



Herba 5-12 cm alta vix decumbens vel adscendens ubique glandulis sessilibus 

 primum rubris demum nigrescentibus sparse obsita ; caulis gracilis anfractus 

 quadrangulatus ad angulos sparse glanduloso-setulosus pilis ad 1 mm longis vix 

 adscendentibus. Folia ut videtur alterna unum paris inconspicuum abortivum 

 appressum glanduloso-setulosum 0.5-1 mm longum in nodis alternans; folia 

 evoluta cum petiolo glabro 1-2 mm longo, lamina 1.3-3.5 X 0.5-0.7 mm 

 lanceolata apice anguste acuta basi acuta tenuiter membranacea uninervata 

 nervis lateralibus aegre evolutis supra pilis inframarginalibus interdum glandu- 

 liferis exceptis glabra subtus in superficie centrali glabra vel sparsissime 

 glanduloso-strigulosa marginem versus sparse glanduloso-strigulosa ubique 

 modice elliptico-punctata punctis ca. 0.3 mm longis primum albidis demum 

 nigrescentibus ad margines incurvo-ciliolata pilis ca. 1 mm longis interdum 

 glanduliferis. Flores 4-meri in foliorum abortivorum superiorum axillis solitarii 

 vel bini primum terminates demum laterales; pedicelli ca. 1 mm longi. Hypan- 

 thium calycis tubum includens 3 mm longum apicem versus (circum torum) 

 sparse glanduloso-setulosum; calycis lobi 1x1.5 mm obverse elliptici apice 



