Hydnophytum virgatum

[Derrick]

H. virgatum Val. (Theodoric Valeton) Just's botanischer jahresbericht. Systematisch geordnetes repertorium der botanischen literatur aller länder, vol.61, p142, (1927). (Bot. Jahrb. Syst.), not yet digitised. Update. Jebb & C. R. Huxley, The tuberous epiphytes of the Rubiaceae 7: a revision of the genus Hydnophytum, Blumea 64, p86, (2019.) With illustration and a member of their Uncertain and Little-Known Species. Type, Ledermann 11646, 11701, 11849 (Bogor Herbarium not seen, presumed lost), Papua New Guinea, East Sepik Province, Schrader Mountains.

I have found a more recent collection claimed to be this species using Valeton’s key, but these are not types. Takeuchi (1995) Papua New Guinea, Madang Province, Bismarck Range.

http://data.biodiversitydata.nl/naturalis/specimen/L%20%200074528 

And. http://data.biodiversitydata.nl/naturalis/specimen/L.2913882

Collection notes. Ant-house epiphyte, tuber brown, completely obscured by roots and debris, leaves coriaceous, dark green, mid green below, inflorescence axillary, sessile, 
pauciflorous,  flower 4 merous, yellow. Papua New Guinea, Madang Province, ridge overlooking campsite 4, at 600-900 m.