[1] Established in 2022, it comprises 13 species of lichens that grow on rock surfaces (saxicolous) and form a thin, crust-like covering (crustose) on their substrate.

Lecaimmeria species are typically found in harsh environments at high altitudes or latitudes, particularly in mountainous regions of western China and across parts of Eurasia.

The genus was created to accommodate species previously classified under Immersaria that shared certain distinct features, following molecular analysis that revealed they formed a separate group.

Lecaimmeria was circumscribed as a new genus in 2024 by Cong-Miao Xie, Lu-Lu Zhang, and Li-Song Wang to accommodate species previously placed in Immersaria that have lecanorine apothecia.

They show a strong preference for siliceous substrates, particularly granite and sandstone, though one species, L. tuberculosa, has been found growing on Qilian jade.

They are commonly found in alpine zones, typically at elevations ranging from 3,100 to 4,800 metres above sea level in the mountainous regions of western China, including areas such as the Qinghai-Tibetan Plateau.

Some species also occur in high-altitude desert-steppe areas, which represent transitional zones between alpine and arid environments where vegetation is sparse and rocky outcrops are common.

[2] The known distribution of Lecaimmeria is primarily centred in Asia, with most species described from China, particularly from the provinces of Qinghai, Sichuan, Tibet, and Inner Mongolia.