Ma'anar ƙamus na "thallus" kalma ce da aka yi amfani da ita a ilmin halitta don komawa ga jikin tsire-tsire na tsire-tsire maras septate kuma mai sauƙi, kamar lichen, algae, ko fungus, wanda ba shi da tsari na musamman don ayyuka kamar ganyaye. , mai tushe, ko tushen. Thallus na waɗannan kwayoyin halitta yawanci tsari ne mai lebur ko reshe wanda ke aiwatar da ayyukan photosynthesis, sha na gina jiki, da haifuwa.