New lichen species and records from the Chapada dos Guimarães, Mato Grosso, Brazil Author Aptroot, André Author Souza, Maria Fernanda Laboratório de Botânica / Liquenologia, Instituto de Biociências, Universidade Federal de Mato Grosso do Sul, Avenida Costa e Silva s / n, Bairro Universitário, CEP 79070 - 900, Campo Grande, Mato Grosso do Sul (Brazil) andreaptroot @ gmail. com (corresponding author) text Cryptogamie, Mycologie 2021 2021-10-06 20 10 171 180 http://dx.doi.org/10.5252/cryptogamie-mycologie2021v42a10 journal article 244476 10.5252/cryptogamie-mycologie2021v42a10 4270e70c-a937-43d6-943b-6658695cf40f 1776-100X 7815166 Gassicurtia pruinosa M.F.Souza & Aptroot , sp. nov. ( Figs 3 , 4 ) MYCOBANK. — MB 839654. Corticolous Gassicurtia without anthraquinone, differing from G. catasema (Tuck.) Marbach by theUV-negative thallus, apothecia brown pruinose, UV+ green, probably due to a xanthone, and ascospores 10-12 × 2.5-3.5 µm. TYPE . — Brazil , Mato Grosso , Cuiabá , Chapada dos Guimarães , Pousada do Parque private area, alt. 700 m , 15°26’50”S , 55°49’50”W , on bark, 12-19.IX.2020 , A.Aptroot & M.F.Souza 81917 ( holo- , CGMS [ CGMS ]; iso- , ABL [ ABL ]). FIG. 3. — Gassicurtia lopesiana sp.nov. ,(left) and Gassicurtia pruinosa sp. nov. (right) under 365 nm UV light, A.Aptroot & M.F.Souza 81496. Width of picture 20 mm. ADDITIONAL MATERIAL EXAMINED. — Brazil . Mato Grosso : Same details as the holotype , A.Aptroot & M.F.Souza 81496 (para-, CGMS ). DESCRIPTION Thallus crustose, greenish grey, areolate, very variable in thickness, partly almost immersed, areoles irregular, c . 0.1 mm diam., thallus surrounded by a c . 0.3 mm wide, brown hyphal prothallus line. Isidia and soredia absent. Apothecia sessile, solitary, angular, rather irregular in shape, not round, 0.2- 0.6 mm diam.; disc black, densely brown pruinose; margin prominent, persistent, c . 0.05 mm wide, glossy, black. Hymenium not inspersed. Paraphyses unbranched. Epithecium with black caps. Hypothecium dark brown. Excipulum brown in section. Ascospores 8/ascus, 10-12 × 2.5-3.5 µm, dark brown, smooth, long ellipsoid. Pycnidia not observed. CHEMISTRY. — Thallus UV-, K-, apothecium disc UV+ green, probably due to an unidentified xanthone (Rf 6 in solvent A[TDA]). ETYMOLOGY. — Named after the pruinose apothecia. ECOLOGY AND DISTRIBUTION. — On tree bark in Cerrado forest; only known from Brazil .