Mark R. D. Seaward

Bacidina sorediata is a species of foliicolous (leaf-dwelling) lichen in the family Ramalinaceae. Found in the Seychelles, it was described as new to science in 2011. It is characterized by its distinct sorediate thallus and pale yellow to orange apothecia.

Arthothelium feuereri is a rare species of saxicolous (rock-dwelling) crustose lichen in the family Arthoniaceae. It forms a thin, pale-brown, varnish-like film on sun-blasted rock and bears scattered black fruit-bodies whose spores are densely divided into many chambers (muriform) and have conspicuously enlarged end-cells. The thallus contains gyrophoric acid—a secondary metabolite common in some lichens but previously unknown in saxicolous members of Arthothelium. The species is known only from its type locality on the summit of Les Trois Frères on Mahé, Seychelles.

Fellhanera silhouettae is a species of crustose lichen in the family Ectolechiaceae. It was described in 2004 from the granitic island of Silhouette in the Seychelles. It forms a thin, granular green thallus on tree bark and occasionally over mosses and is recognised by its minute urn-shaped, orange-brown fruit-bodies, a hypothecium that flashes deep crimson when a drop of potassium hydroxide solution is applied, and elongate, five- to six-septate spores. The species appears to be confined to the mid-elevation evergreen forests of Silhouette Island, and may well be endemic there.

Cratiria sorediata is a species of corticolous (bark-dwelling), crustose lichen in the family Caliciaceae. It was first described as a new species in 2009. The type specimen was collected from Aldabra in the Seychelles.

Pyrrhospora palmicola is a type of corticolous (bark-dwelling), crustose lichen in the family Lecanoraceae. It has a yellow thallus with rounded to irregular apothecia (fruiting bodies) with pale brown or black discs. The lichen is found in Mato Grosso, Brazil, and the Seychelles.

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Coenogonium subsquamosum is a species of corticolous (bark-dwelling) crustose lichen in the family Coenogoniaceae. The lichen forms a distinctive straw-yellow crust with a cracked to somewhat scaly texture, bearing deep yellow apothecia (reproductive discs) that are slightly darker than the thallus. It is known only from Silhouette Island in the Seychelles, where it grows on tree bark in coastal environments near the high-tide mark.

Coenogonium stramineum is a species of corticolous (bark-dwelling) crustose lichen in the family Coenogoniaceae. Originally described as Dimerella straminea in 2004, it was transferred to the genus Coenogonium in 2006. The lichen forms a wafer-thin, grey-white to grey-green crust on tree bark, distinguished by its tiny yellowish apothecia (reproductive discs) that give the species its epithet, which means "straw-coloured" in Latin. It is known only from its type locality on Silhouette Island in the Seychelles, where it grows as an epiphyte in the island's lower-montane evergreen forest.