n 2011, isolated parts in south Indian state of Kerala as well as neighboring Sri Lanka experienced sporadic spell of red colored “blood rain”, cause of which was later attributed to terrestrial subaerial microalgae of the genus Trentepohlia. Green algae of this genus is commonly found living in symbiosis as phycobionts of lichens in the freeliving form in adjoining tropical rain forests, however, specific identity of which have never been determined. It is known that lichens disperse small algal-hyphal packages, so-called soredia, for vegetative reproduction, which can explain the content of Trentepohlia-spores in the water.
Citation: Bast F, Bhushan S, Ahmad John A, Achankunju J, Nadaraja Panikkar MV, et al. (2015) European Species of Subaerial Green AlgaTrentepohlia annulata (Trentepohliales, Ulvophyceae) Caused Blood Rain in Kerala, India. J Phylogen Evolution Biol 3:144.