Marcela Eugenia da Silva Cáceres

Trichothelium angustisporum is a species of corticolous (bark-dwelling), crustose lichen in the family Porinaceae. It is found in subtropical regions of Guyana and the Atlantic Forest of Brazil. The lichen was formally described as a new species in 2004 by lichenologists Marcela Eugenia da Silva Cáceres and Robert Lücking. The species epithet refers to its narrow and elongated ascospores.

Sprucidea is a genus of five crustose lichens in the family Malmideaceae. Similar to the related genus Malmidea, Sprucidea is characterized by frequently red thalli that contain the secondary compound norsolorinic acid, but differs in the rod-shaped instead of ellipsoid ascospores and in the stalked sporodochia as conidiomata. Sprucidea species are found in rainforest areas in South America and Southeast Asia.

Psammina tropica is a species of corticolous (bark-dwelling) crustose lichen of uncertain classification in the Ascomycota. This lichen was discovered in 2016 growing on tree bark in disturbed forests of the Brazilian Amazon, with specimens found in both Amapá and Rondônia states. It is distinguished by its unique star-shaped reproductive structures that have 3–6 arms, each made up of several cells, which help identify it from related species.

Neosergipea is a genus of lichen-forming fungi in the family Roccellaceae. It has four species, all of which are corticolous (bark-dwelling), crustose lichens that are found in the tropical forests of Brazil. This genus is related to the genera Dichosporidium, Enterographa, and Erythrodecton. It distinguishes itself through unique morphological characteristics and certain chemical constituents, in particular, its non-carbonised ascomata and the presence of a vivid orange anthraquinone compound.

Neoprotoparmelia plurisporibadia is a species of saxicolous (rock-dwelling), crustose lichen in the family Parmeliaceae. It is found in Rio Grande do Sul, Brazil, where it grows on granite rocks in low, open mountainous areas.

Neoprotoparmelia brasilisidiata is a species of bark-dwelling crustose lichen in the family Parmeliaceae. Found in parks and open areas across the Neotropics, it has been recorded from Costa Rica, El Salvador, and Brazil. The species was formally described in 2018 by Garima Singh, Marcela Cáceres, and André Aptroot from specimens collected in Serra de Itabaiana National Park in Brazil. The name brasilisidiata reflects both its Brazilian origin and the presence of isidia (small reproductive structures). The lichen can be distinguished from similar species by its greenish-white fluorescence

Mycocalicium enterographicola is a species of lichenicolous fungus in the family Mycocaliciaceae. It is found in Brazil.

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Diorygma microsporum is a species of corticolous (bark-dwelling) crustose lichen in the family Graphidaceae. It was described as new to science in 2011. It has a neotropical distribution, and has been collected in Florida, Colombia, Brazil, and India. Notable for its small ascospores, this lichen thrives in undisturbed rainforests and serves as an indicator of forest health.

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Viridothelium ustulatum is a species of corticolous (bark-dwelling) lichen in the family Trypetheliaceae. Found in Brazil, it was formally described as a new species in 2017 by Marcela Eugenia da Silva Cáceres and André Aptroot. The type specimen was collected by the authors along a trail near a field station in the Adolfo Ducke Forest Reserve (Manaus); here it was found growing on tree bark in old-growth rainforest. The thallus of the lichen is dull olive-green, and lacks a prothallus. The species epithet refers to the black pseudostromata (a stroma in which fungal cells and remnants of host

Viridothelium leptoseptatum is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae, first described in 2016. Found in Brazil, it resembles Astrothelium aeneum but differs in several key aspects, including the absence of pigment on the thallus and specific features of its ascospores.

Trypethelium luteolucidum is a species of lichen in the family Trypetheliaceae, first formally described in 2016. Found in Brazil and Mexico, it is similar to Trypethelium regnellii, but differs by the presence of anthraquinone crystals in the pseudostromata.

Thelocarpon triseptatum is a wood-dwelling lichen in the family Thelocarpaceae. This lichen was discovered in 2016 growing on dead wood in savanna vegetation near Macapá in northern Brazil. It forms a close partnership with colonies of green algae, creating tiny, pale fruiting structures that contain spores divided by three cross-walls.

Thelenella monospora is a species of saxicolous (rock-dwelling) crustose lichen in the family Thelenellaceae. This lichen was discovered in 2016 growing on silica-rich rocks in the primary rainforest of Brazil's Amapá National Forest. It is unusual because its spore-containing structures hold only one large spore each, rather than the typical eight spores found in most related species.

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Pyrenula xanthoglobulifera is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. First described in 2013 from specimens collected in Chapada do Araripe, Brazil, it is characterized by its pale yellowish-brown thallus with white pseudocyphellae, spherical fruiting bodies immersed in thalline warts, and large brown muriform ascospores visible even under a stereo microscope. The species is distinguished by the presence of lichexanthone, which causes the thallus to fluoresce yellow under ultraviolet light. It primarily grows on smooth tree bark in Caatinga forest

Pyrenula viridipyrgilla is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species forms a smooth, glossy olive-green crust that can cover large areas of tree bark and produces tiny pear-shaped fruiting bodies deeply embedded in the bark with pale yellowish waxy openings. It is known only from its type locality in primary rainforest along the Amazonas/Rondônia border in northwestern Brazil.

Pyrenula sanguinea is a rare species of lichen belonging to the family Pyrenulaceae. This species is characterized its bright red, prominent to sessile growths on tree bark in the rainforests of Rondônia, Brazil. What makes Pyrenula sanguinea unique are its trypethelioid ascomata—structures housing the reproductive spores—that are fused together, and its brown ascospores (spores) surrounded by a thick, gelatinous sheath with distinctive horn-like appendages.

Pyrenula rubrostigma is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species is readily identified by its distinctive bright red apical opening on the fruiting bodies, caused by an anthraquinone pigment that turns purple when treated with potassium hydroxide solution. It forms a thin olive-brown crust on smooth bark in lowland rainforests and is widely distributed across several Brazilian states.

Pyrenula rubronitidula is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. It is recognized by its thin, dark red crust on tree bark and the tiny black dots that mark the openings of its fruiting bodies. The species was described in 2013 from the Brazilian Amazon and known only from lowland rainforest in northern Brazil.

Pyrenula paraminarum is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species forms a smooth olive-brown crust on bark and produces tiny hemispherical fruiting bodies 0.3–0.5 mm across that typically occur in clusters of two to eight, with neighboring structures often partially fused but each maintaining its own black pore. It is known from the Brazilian states of Rondônia and Mato Grosso.

Pyrenula inframamillana is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species forms a thin olive-green to olive-brown crust on tree bark and produces solitary cone-shaped fruiting bodies 0.4–0.9 mm across that sit on the thallus surface. Originally described from Rondônia, it has since been found to be widely distributed across Brazil, with records from ten additional states spanning the Amazon basin to the central and northeastern parts of the country.

Pyrenula infraleucotrypa is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species forms a thin glossy crust ranging from yellowish brown to olive green on tree bark and produces cone-shaped fruiting bodies that typically grow in dense groups of 3 to 40, often fusing sideways to form black crusty patches. It is widely distributed across Brazil, having been recorded from 14 states spanning the Amazon basin, northeastern coast, and central parts of the country.