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Haesselia roraimensis is a species of liverwort in the family Cephaloziaceae. It is endemic to Guyana. Its natural habitat is on rotten logs in periodically flooded riverine forest from 550–1,550 m (1,800–5,090 ft) elevation, in the humid submontane tropical 'mossy' forests on the slopes of Mount Roraima, where the borders of Brazil, Venezuela, and Guyana meet.
Haesselia roraimensis is known only from Mount Roraima in Guyana, specifically from its northern slopes and foothills, where it grows at elevations between 550–1,550 m (1,800–5,090 ft) above sea level. The species appears to flourish particularly well at altitudes between 700–1,400 m (2,300–4,600 ft). The liverwort inhabits two distinct forest types: periodically flooded riverine forest and dense, humid submontane "mossy" forest at the foot of Mount Roraima. Within these habitats, it primarily grows on decomposing logs and dead wood, where it can form extensive mats. Less commonly, it can be found growing on the bases of tree trunks and exposed roots. H. roraimensis grows alongside various other bryophytes, including Anomoclada mucosa, Leucobryum crispum, Micropterygium trachyphyllum, and species of Riccardia. It is also found in association with members of the moss families Hookeriaceae and Sematophyllaceae.
Text excerpted from the Wikipedia article Haesselia roraimensis by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
