(botany) Any of very many primitive plants that consist of a thallus (plant body not differentiated into roots, stems and leaves), formerly collected in the obsolete taxonomic group Thallophyta.
1994, Estrelita A. Madriaga, Anthony Lee, Felicitas B. Ventura, Orlando A. Oronce (coordinator), Biology: Science and Technology II, page 347,
They lack the vascular tissues; thus, they are called thallophytes. Algae are thallophytes with chlorophyll. […] Fungi are thallophytes without chlorophyll.
1994, Pat E. Rasmussen, Chapter IV.5: Mercury in Vegetation of the Precambrian Shield, Carl J. Watras, John W. Huckabee (editors), Mercury Pollution: Integration and Synthesis, page 422,
In general, the usefulness of the thallophytes as Hg bioindicators was limited by their sporadic occurrence in the forest environment. Because of the importance of the thallophytes as components of the food chain, however, several samples from different groups (summarized in Table 2) were collected for comparison with values reported in the literature.
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