We don't have synonyms for gemmula yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are gemmule.
(n) :
Alternative form of gemmule (in various senses) [(biology) (archaic) Synonym of gemma (“an asexual reproductive structure, as found in animals such as hydra (genus Hydra) and plants such as liverworts (division Marchantiophyta), consisting of a cluster of cells from which a new individual can develop”)]
(n) :
Alternative form of gemmule (in various senses) [(biology) (archaic) Synonym of gemma (“an asexual reproductive structure, as found in animals such as hydra (genus Hydra) and plants such as liverworts (division Marchantiophyta), consisting of a cluster of cells from which a new individual can develop”)]