A new species of Parmotrema (Parmeliaceae, lichenized Ascomycota) from <i>Cerrado</i> vegetation in the state of Maranhão, Brazil

Cunha-Dias, Iane Paula Rego; Santos, Jayane Sousa; Dutra, Tamires Silva; Santos, Adrielle de Jesus Machado; Nascimento, Gildean Macedo

doi:10.1590/2175-7860202576024

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Original Papers • Rodriguésia 76 • 2025 • https://doi.org/10.1590/2175-7860202576024 linkcopy

A new species of Parmotrema (Parmeliaceae, lichenized Ascomycota) from Cerrado vegetation in the state of Maranhão, Brazil

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A new species of Parmotrema, with medullary lecanoric acid (P. paraisoense), is proposed here. It features a foliose thallus with linear interrupted to subcapitate soralia, occurring mainly on the margins of the lobes. The lobes are 4-8 mm wide, with a ciliate margin, and contain atranorin and lecanoric acid as the main secondary metabolites. This species has a corticolous habit and was found on a fallen tree branch in a cerradão area, a typical vegetation of the Cerrado biome, in the Brazilian state of Maranhão.

Key words:
Foliose thallus; Lecanoric acid; Lichens; Soralia

Species	Lobes	Cilia	Soralia and soredia	Lower surface	Pycnidia	Conidia	Medullary chemistry
P. austrosinense (Spielmann & Marcelli 2009)	Irregularly branched, overlapping laterally, rounded apex, 3.5-7.5 mm wide	Absent	Linear continuous or sometimes interrupted (marginal); farinose soredia	Marginal zone white variegated or brown, lustrous; central zone black, opaque	Scarce; ostiole black (submarginal)	Filiform (11-14 µm long)	Lecanoric acid
P. cooperi (protologue, Zahlbruckner 1926; Krog & Swinscow 1981)	Rotund, axils incised, 5-7 mm wide	Black, simple, up 2.5 mm long; up 6.5 mm long (Masson et al. 2024)	Linear to labriform or subcapitate (marginal); granular soredia	Marginal and central zones black, opaque	Scarce; ostiole black (submarginal) (Masson et al. 2024)	Bacillar (9-14 µm long) (Zahlbruckner 1926)	Lecanoric acid
P. defectum (protologue, Hale 1965; Krog & Swinscow 1981)	Sinuous to agglomerated in the center, revolute margin, apex rounded; 5-15 mm wide	Absent	Linear; marginal to submarginal; coarsely granular soredia	Marginal zone brown; central zone black	Not specified	Filiform (10-12 µm long)	Lecanoric acid
P. eitenii (Marcelli et al. 2007)	Irregularly branched, laterally overlapping, apex rounded or subrounded, 3-14 mm wide	Absent	Linear interrupted; soredia granular, becoming corticated or isidioid	Marginal zone brown, lustrous; central zone black	Not reported	Not reported	Lecanoric acid
P. paraisoense	Slightly raised margin irregular, apex rounded, 4-8 mm wide	Infrequent, black, simple, 0.5-1 mm long	Linear interrupted to subcapitate (marginal or submarginal); granular soredia	Marginal zone brown, lustrous; central zone black, lustrous	Rare; ostiole brown (marginal)	Bacillar to filiform (8.5-12.5 µm long)	Lecanoric acid

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