New crustose lichens from a tropical coastal area in Paraná (Brazil) Author Aptroot, André Author Souza, Maria Fernanda Universidade Federal de Mato Grosso do Sul, Instituto de Biociências, Laboratório de Botânica Liquenologia, Av. Costa e Silva, s / n, 79070 - 900, Campo Grande, MS (Brazil) andreaptroot @ gmail. com (corresponding author) text Cryptogamie, Mycologie 2021 2021-11-10 20 12 191 197 journal article 244475 10.5252/cryptogamie-mycologie2021v42a12 c95fd89d-a9f8-4380-bf52-321cb435a847 1776-100X 7815207 Cryptothecia duplofluorescens Aptroot & M.F. Souza , sp. nov. ( Fig. 1 A-C) Corticolous sterile Cryptothecia with thallus pale ochraceous, dull, thin, containing lichexanthone, soralia delimited, containing 2’-O-methylmicrophyllinic acid, soredia globose to short ellipsoid, c . 25-40 µm diam, often with thin protruding hyphae. MYCOBANK. — MB839446. TYPE . — Brazil , Paraná , Guaraqueçaba , Tagaçaba Porto da Linha , road PR– 405 km 36.2, at right side of road, in chácara (property of Donald Schause), 14.X.2020 , alt. 15 m , on palm tree bark, A. Aptroot & M.F. Souza 82161 ( holo- , CGMS ; iso- , ABL ). ADDITIONAL MATERIAL STUDIED. — Same details, A. Aptroot & M.F. Souza 82090 ( CGMS ). DESCRIPTION Thallus corticolous, pale ochraceous, dull, thin, IKI negative, covering an area of up to 4 cm diam., surrounded by a c . 0.2 mm wide brown hyphal prothallus line. Algae trentepohlioid, orange, c . 10-17 µm diam. Soralia delimited, patchy, covering about half of the thallus surface. Soredia globose to short ellipsoid, IKI negative, filled with small crystals, c . 25-40 µm diam, often with thin protruding hyphae. Ascomata and pycnidia not observed. CHEMISTRY. — Thallus C-, K-, P-, UV+ yellow, with lichexanthone; soralia UV+ white, with 2’- O -methylmicrophyllinic acid. The substance 2’-O-methylmicrophyllinic acid and lichexanthone were demonstrated by tlc.