Here's a snippet of a conversation that Rav Yaakov Chizkiah Greenwald of Pupa had with Rav Aaron Teitelbaum of Satmar, as it's recorded here
trans.: The Pupa Rebbe: I remember my father OBM was once in Florida, he met there a Jew who presented himself as a professor of botany. So my father asked him do you know anything about birds that grow on trees? so he stood still and answered no. So my father told him that in Shulhan Arukh such a creature is discussed.
Our Rebbe [Rav Teitelbaum]: Yes, in Yoreh De'ah (83:15).And then the conversation turned to something else.