In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

In one relationship, they envelop the gonidia or allow reproduction via the soredia. The first structures to emerge from the propagule, they are composed of chitin, and secrete the enzyme laccase. They lack plastids, though their central vacuoles are surrounded by a multinucleate cytoplasm that provides mass for their statolithic function. Modified in parasites to form tissue-penetrating haustoria, during symbiosis, their specialized mycorrhiza form invades invaginations of the cell membrane of vascular plants. FTP, name these threadlike filaments that make up the mycelium in true fungi.
Science