The lichen diversity of the Caribbean region of Colombia is one of the least known in the county. In the Sierra Nevada de Santa Marta (SNSM), whose forests are at risk of disappearing due to deforestation, 114 species of lichens have been recorded. We collected lichens at elevations from 500 to 2500 m on the northwestern slopes of the SNSM, and we report six genera and 19 species from this region for the first time. Our results highlight the importance of exploring new areas to enhance our knowledge of the lichens of SNSM and Colombia.

Three new records of Agaricales species from the Colombian Caribbean region are presented: Agrocybe pediades (Fr.) Fayod, Macrocybe titans (H.E. Bigelow & Kimbr.) Pegler, Lodge & Nakasone, and Podaxis pistillaris (L.) Fr. Descriptions, photographs, and illustrations of the macroscopic and microscopic features of each species are presented, as well as a brief discussion of their distribution.

The Agaricales are the largest clade of mushroom-forming fungi, in Colombia, with 544 species of the approximately 16,000 species currently recognized worldwide in the phylum Basidiomycota. We document seven species of Agaricaceae for the first time from the Colombian Caribbean region. Two of these species are newly recorded from the country: Leucoagaricus lilaceus Singer and Leucoagaricus roseilividus (Murrill) E. Ludw. Five species are reported from the Colombian Caribbean for the first time: Agaricus griseorimosus Pegler, Chlorophyllum hortense (Murrill) Vellinga, Leucoagaricus rubrotinctus (Peck) Singer, Leucocoprinus cepistipes (Sowerby) Pat., and L. venezuelanus Dennis.