One charming and welcoming flower on one 0.5-cm inflorescence emerging from the base of one of three ovate-lanceolate dark green leaves, underside flushed burgundy, mounted on a 4-cm x 7-cm wood slab; sepals and petals translucent pale yellow, apices subacute; lip ovate, white, blotched burgundy, side lobes extend forward, blotched light burgundy; substance firm; texture slightly crystalline; personally identified on site by Franco Pupulin for whom the species was named.

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Additional Details
References:
1- https://epidendra.com/taxones/Trichocentrum/Trichocentrum%20pupulinianum/Bogarin&Karremans%202013%20-%20Trichocentrum%20pupulinianum.pdf
2- https://epidendra.com/taxones/Trichocentrum/Trichocentrum%20pupulinianum/index.html