Thelotrema nostalgicum
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| Thelotrema nostalgicum | |
|---|---|
Scientific classification  | |
| Kingdom: | Fungi |
| Division: | Ascomycota |
| Class: | Lecanoromycetes |
| Order: | Graphidales |
| Family: | Graphidaceae |
| Genus: | Thelotrema |
| Species: | T. nostalgicum |
| Binomial name | |
| Thelotrema nostalgicum G.Salisb. (1972) | |
Thelotrema nostalgicum is a species of corticolous (bark-dwelling) lichen in the family Graphidaceae.[1] It has a pale, shiny thallus and hemispherical fruiting bodies with colourless, highly segmented ascospores. It was described from bark-growing material collected in Sri Lanka (then Ceylon) and is known only from that country.
Thelotrema nostalgicum was described as a new species by the British lichenologist George Salisbury in 1972, in a revision of Thelotrema sect. Thelotrema (specifically the T. lepadinum group). The holotype was collected on bark at Pidurutalagala (historically recorded as "Pedrotallegalle") in Ceylon in 1879 by Almquist and is preserved in the Nylander herbarium at H (herb. Nyl. 22741). Salisbury noted that Nylander had earlier placed the type specimen under Thelotrema dolichotatum, but considered it distinct and stated that T. dolichotatum belongs to the T. cavatum group (with a carbonaceous excipulum and a cylindrical columella);[2] Thelotrema cavatum is now known as Ocellularia cavata.[3] In Salisbury's arrangement, T. nostalgicum was included in the T. lepadinum group and has colourless, septate spores (an "Ocellularia-type" spore).[2]