thus validating the monophyly of the genus. Traditionally, Rozella has been classified as a member of Chytridiomycota, either as a member of Chytridiales or Spizellomycetales. However, molecular phylogenies place it well outside of Chytridiomycota with a plethora of environmental sequences. There is considerable debate over the name of this larger clade: Cryptomycota, Rozellida, Rozellamycota. Notable Species Rozella allomycis Rozella allomycis is one of the most extensively studied species; it was first described by Foust in 1937. Foust did not provide a Latin description, which invalidated the name; Doweld, in 2014, validated the name and corrected the specific epithet to allomycetis. Rozella allomycis can parasitize multiple Allomyces species, including A. macrogynus and A. arbuscula. For A. macrogynus, it is able to parasitize both the sporophyte and the gametophyte. R. allomycis zoospores are chemotaxically attached to Allomyces. Once in contact, the zoospore encysts and germinates. The host cell wall is penetrated with an infection tube, and the contents of the zoospore are injected into the host. The infection tube causes an invagination of the host cell membrane, which then envelopes the R. allomycis protoplast. Host mitochondria are recruited to the host-parasite interface. Sometimes, host mitochondria are found within the R. allomycis protoplast within three-membrane vacuoles, which is evidence the R. allomycis protoplast is phagocytizing the host cytoplasm as it grows. As it grows, the R. allomycis protoplast completely fills a portion of the host, which is separated by a host septum. The protoplast develops into a zoosporangium and releases zoospores. As the infection progresses, R. allomycis protoplasts will instead form resting spores with thick, spiny walls. Rozella polyphagi Rozella polyphagi was first described in 1938 by F. K. Sparrow as a parasite of Polyphagus laevis, though it also parasitizes Polyphagus euglenae. Rozella polyphagi infects both the prosporangium and the sporangium of the host and exists as an unwalled protoplast within the host. Host mitochondria could be observed within R. polyphagi protoplast vacuoles; cytoplasmic extensions of R. polyphagi around host cytoplasm also occur. This suggests that Rozella polyphagi phagocytizes host cytoplasm. Rozella rhizoclosmatii A species of Rozella on Rhizoclosmatium was first reported in a molecular phylogeny simply as Rozella ex Rhizoclosmatium and was later named Rozella rhizoclosmatii. The species causes hypertrophy of infected Rhizoclosmatium and completely fills the host. In contrast to other Rozella species, infection does not take place when the host is growing. Rozella rhizoclosmatii zoospores are attracted to and infect