The Collaborative International Dictionary
Thalloid \Thal"loid\, a. [Thallus + -oid.] (Bot.) Resembling, or consisting of, thallus.
Wiktionary
a. 1 Of or pertaining to a thallus. 2 (context botany English) Of a plant, alga, or fungus lacking complex organization, especially lacking distinct stems, roots, or leaves.
WordNet
adj. of or relating to or resembling or consisting of a thallus
Usage examples of "thalloid".
In thalloid forms fimbriate or lobed margins or outgrowths from the surface lead to the same result.
The protonema forms a flat, lobed, thalloid structure attached to the soil by rhizoids, and the plants arise from marginal cells.
The lower members of the Jungermanniales are also thalloid, but the thallus never has the complicated structure characteristic of the Marchantiales, and progress is in the direction of the differentiation of the plant into stem and leaf.
The Marchantiales are a series of thalloid forms, in which the structure of the thallus is specialized to enable them to live in more exposed situations.