Name any two liverworts.

Marchantia and Riccia are two common and widely studied examples of liverworts, representing the diversity within this group of bryophytes. Marchantia is perhaps the most familiar liverwort, easily recognized by its flat, ribbon-like green thallus with a distinctive pattern of polygonal markings on the upper surface, often found growing on moist soil, rocks, or near water bodies. It reproduces both sexually through specialized umbrella-like structures (archegoniophores and antheridiophores) and asexually through small cups containing gemmae—vegetative propagules that disperse to form new plants.

Riccia is another common liverwort with a simpler structure, forming dense green rosettes or mats that float on water surfaces or grow on damp soil. Other familiar examples include Pellia, which has a dichotomously branching thallus, and Porella, a leafy liverwort with a more complex structure. These primitive plants lack true roots, stems, and leaves, instead using rhizoids for anchorage and absorbing water and nutrients directly through their thin tissues. Liverworts are ecologically important as pioneer species that colonize bare substrates, contribute to soil formation, and provide microhabitats for tiny invertebrates, demonstrating that even small, simple organisms play significant roles in ecosystem functioning.