The large boat shaped structure (bottom side of the flower) is the synsepal. Dresslerella is a small genus with about 13 species at this moment. Most of them have distinctive fuzzy leaves and flowers. There has been a confusion about D. lasiocampa and D. hirsutissima , and many plants sold as D. hirsutissima were actually D. lasiocampa . Indeed, I purchased my plant as D. hirsutissima PRS1362 from Mundiflora , but it turned out to be D. lasiocampa . Medina and Pupulin (2010) has a good review of the history of this confusion as well as an easy key to identify Dresslerella species. Briefly, the confusion originated from the illustration of D. hirsutissima in Luer (1988, link to the illustration). The illustration was based on D. lasiocampa. In 2005, Luer and Hirtz noticed the error and described the new species D. lasiocampa, based on this specimen. Luer has the updated, correct illustration in the later volume of Ico...
Plants, Orchids, and Life in North