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A new species Enterographa assamica, in the family Roccellaceae sensu lato is described from Assam, India. It is characterized by whitish grey thallus, rounded to elongate ascomata with yellowish-white thalline margin and presence of lichexanthone and confluentic acid in the thallus. A key to all the known species of Enterographa in India is also provided.

The lichen species Alyxoria culmigena (Lib.) Ertz collected from the Andaman and Nicobar Islands, is reported as a new record to India. A detailed description and figures of new record along with distribution map and key to all known Alyxoria species in India are provided.

The type specimens of Synarthonia bicolor and S. stigmatidialis were examined, leading the authors to revise their descriptions as well as the generic description. Also, two new species of Synarthonia, viz. S. psoromica and S. sikkimensis are described from India. Synarthonia psoromica, collected from the Nilgiri Hills of Tamil Nadu, is characterized by immersed synascomata and the presence of psoromic acid. Synarthonia sikkimensis, collected from Sikkim-Himalaya, is characterized by the sorediate thallus with a rhizomorph-like prothallus. These distinguishing characters are observed for the first time in Synarthonia. After considering the protologue of the recently described S. sarcographoides, a comprehensive account of this genus is made. In addition, a world key to all known species of Synarthonia is provided.

Additional distribution of 25 species of the genus Cryptothecia from different states of India has been provided. Earlier these species were known from limited localities, and currently, they are recorded from the almost all parts of India which is discussed in the present paper. The present study is based on observation of a large number of specimens annotated as ‘sterile specimen’ and other voucher specimens preserved at CSIR-National Botanical Research Institute herbarium (LWG).

A lichen species Syncesia farinacea (Fée) Tehler collected from the Nilgiri hills of Tamil Nadu is reported as new to India. A detailed description and figures along with additional information about its pycnidia, oil globules in young ascomata and rare isidia like structures not mentioned in earlier reports for this species are also provided.

A corticolous lichen species, Opegrapha granulosa Siljo & G. P. Sinha, with a UV+ pale yellow thallus, is described as new to science from the Sundarbans Biosphere Reserve, West Bengal, India.