14a. 
as 
19a. 
20. 
20a. 
ok 
Lip not segmented; petals unadorned or with marginal or 
PMTAMAToial CANOSILY 4 inee deere weeds een nowsos i 
Column erect, footless or with an oblique base; rostellum 
large, sensitive, i.e. when pollinia removed, it bends over 
Sad Tides The SUNG. hye e eng aes Apatostelis 
Column arcuate with a prominent foot; rostellum neither 
sensitive nor hides the stigma ...............2005 16 
Petals unadorned, membranaceous .............. 17 
Petals fleshy, always with callosities at or near margin 
Ades DROS MEME OLE EA OTA EOE Oe ea Masdevallia 
(Luerella) 
Plants rhizomatous, repent; peduncle almost none, I- to 
2-flowered:; flowers sessile ............. Phloeophila 
(Geocalpa) 
Plants aggregate; peduncle manifest, 1- to many-flowered; 
TOW PCCIGCIAUS avn sneak ooteds ences eeeed ess 18 
Sepals always united into a distinct sepaline tube; base of 
lip free from column-foot ............ Physosiphon 
Sepals shallowly connate, ringent; base of lip clasping 
COWNMNIG-TOOU 454.005 enue ik vesu year eesees Triaristella 
Stigma or stigmata terminal; rostellum prominent; anther 
more or less reclining; column without wings or auricles 
Tee Tee Pe ee ree ere me rn Tar ee 20 
Stigma on face of column; rostellum short; anther in- 
clined; column with distinct wings or auricles .... 21 
Sigmata 2, one on each side of rostellum; column very 
short, dilated toward apex, without a foot; secondary 
stem with muricate, hirsute (lepanthiform) sheaths 
ke LAER CAREER Oe eRe ee Lepanthopsis 
Stigmata confluent, 1, transversely elliptic or reniform, 
often protruding on both sides of rostellum; column short 
to elongate, dilated toward the pedestal-like column-foot; 
secondary stem with glabrous sheaths .. Pleurothallis 
(Subgen. Pleurothallis) 
Column sessile, footless, consists of a large conspicuous 
cucullate clinandrium; inflorescence always terminal 
TCE Ee Oe eee See ee ee ee ee ee Platystele 
ep. 
