1. thallus

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


  • plant structure
  • plant part


  • θαλλός (Ancient Greek (to 1453))

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Sentences with thallus

1. Adjective
Not as large as brown algae, the red seaweed body (thallus) is built of complex, branched filaments.

2. Noun, singular or mass
Hornworts do not grow flowers, and they gain their name from their spore capsules, the sporophyte part of the plant that resembles a horn growing out of the thallus.