O. Phalaenopsis, Amer. Orch, Soc. Bull. 42: 1009, 1973, as O. 
Phalaenopsis. 
Oncidium Phalaenopsis Linden & Rchb.f. in Gard. 
Chron. 416, 1869. 
Syn. : Oncidium cucullatum var. Phalaenopsis (Linden 
& Rehb.f.) Nichols., Hl. Dict. Gard. 2: 485, 1886. 
Oncidium olivaceum var. Phalaenopsis (Linden & 
Rehb.f.) Sander, Orch. Guide 188, 1901, in syn. 
Type: Ecuador, without precise locality. Coll. Wallis 
sn! (W). 
Observation: Dorsal sepal 18 mm. long, 9 mm. wide; lateral sepals 
connate, bifid, 18 mm. long, 7 mm. wide; petals acute, 17 mm. long, 
10 mm. wide; lip 33 mm. long, 22 mm. across lateral lobes, 32 mm. 
across terminal lobe. 
The callus of the lip is very characteristic, obovate in outline, con- 
cave with entire raised margins, bidentate at apex, and with a third, 
shorter keel in the center originating from the middle of the callus. 
There is a good colored drawing from the type plant among Day’s 
sketches at Kew, Book 13, page 33, prepared in 1868, a year earlier 
than Reichenbach’s description. 
Oncidium Dayanum (Rchb.f.) Stacy, comb. nov. 
Basionym: Oncidium cucullatum var. Dayanum 
Rehb.f. in Gard. Chron. 834, 1871. 
Type: Ecuador, without proper locality. Imported 
and cultivated by Day, s.n./ (W). 
Syn.: Oncidium Phalaenopsis var. Brandtiae Hort. in 
Sem. Hortic. 2: 175, 1898. 
Type: Reported from cultivation, no specimens known 
to exist. The photograph published subsequently under 
O. Phalaenopsis in Orchid Rev. 9: 169, 1901, most proba- 
bly represents a picture of the type. 
Observation: Oncidium Dayanum is much smaller than O. triptery- 
gium. Dorsal sepal narrowly elliptic, acute, 13 mm. long, 6 mm. wide; 
lateral sepals connate, bifid, 16 mm. long, 7 mm. wide; petals sub- 
spathulate, elliptic, acute, 13 mm. long, 7 mm. wide; lip 3-lobed, 
wider than long, constricted above the middle, without an isthmus; 
whole lip 20 mm. long, 16 mm. across lateral lobes, 24 mm. across 
terminal lobe. 
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