thallus

English Thesaurus

1. a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes (noun.plant)

hypernym	:	plant part, plant structure,
definition	:	any part of a plant or fungus (noun.plant)

hyponym	:	crustose thallus,
definition	:	thin crusty lichen thallus; adheres closely to or is embedded in the surface on which it grows (noun.plant)