haustorium 2013-04-03T11:21:38Z BTO:0000515 FAO:0000066 The appendage or portion of a commensal or parasitic fungus (the hyphal tip) that penetrates the host's tissue and draws nutrients from it. Haustoria may arise from intercellular hyphae, appressoria, or external hyphae. fungal_anatomy_ontology mariacostanzo hyphal tip